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   PlayerZones:
   - Owner: 1
     Spawners:
     - SpawnerIdInZone: 0
-      TilePosition: {x: 3, y: 3}
+      TilePosition: {x: 14, y: 83}
       TileArea:
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-      Facing: 2
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+      Facing: 1
     LeakExits:
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       TileArea:
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-      - {x: 36, y: 6}
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       NormalizedWeight: 1
   - Owner: 2
     Spawners:
     - SpawnerIdInZone: 0
-      TilePosition: {x: 40, y: 12}
+      TilePosition: {x: 28, y: 40}
       TileArea:
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-      - {x: 39, y: 7}
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-      - {x: 41, y: 16}
-      - {x: 42, y: 16}
-      - {x: 43, y: 16}
-      Facing: 1
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+      Facing: 3
     LeakExits: []
   Goals:
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-    - {x: 66, y: 0}
-    - {x: 67, y: 0}
-    - {x: 65, y: 1}
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-    - {x: 67, y: 5}
-    - {x: 65, y: 6}
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-    - {x: 67, y: 6}
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+    - {x: 12, y: 7}
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+    - {x: 13, y: 9}
+    - {x: 14, y: 9}
+    - {x: 15, y: 9}
+    - {x: 16, y: 9}
+    - {x: 17, y: 9}
diff --git a/Assets/_Project/Scenes/Levels/TestLevel_Thumbnail.png b/Assets/_Project/Scenes/Levels/TestLevel_Thumbnail.png
index 8f50996..d282ffc 100644
--- a/Assets/_Project/Scenes/Levels/TestLevel_Thumbnail.png
+++ b/Assets/_Project/Scenes/Levels/TestLevel_Thumbnail.png
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:62cfc398409e4285b50681d79ae4767183db364b3f9feb9072ddf9dd60ec07d9
-size 12253
+oid sha256:3c98285c3a823f2942e9dff02edf75918e7336b4f1496570f2e32a2ffc80e55e
+size 8745
diff --git a/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs b/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs
new file mode 100644
index 0000000..bff8b19
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs
@@ -0,0 +1,121 @@
+// Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs
+using UnityEngine;
+using UnityEngine.Rendering.Universal;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Visualizes a builder's build range as a decal projector circle on the ground.
+    /// Visible only to the owning client, and only while placement mode is active.
+    /// </summary>
+    /// <remarks>
+    /// <para>Sits as a child of the <see cref="Builder"/> GameObject. The
+    /// <see cref="DecalProjector"/> renders a circular texture onto whatever ground
+    /// geometry is below — flat plane or sloped terrain alike, no special handling needed.</para>
+    ///
+    /// <para><b>Owner-only.</b> Non-owning clients should not see other players' build
+    /// range indicators (would be visual clutter). The decal projector is force-disabled
+    /// for non-owners on spawn.</para>
+    ///
+    /// <para><b>Toggling.</b> The indicator is only visible when the local player is in
+    /// placement mode. It checks <c>TowerPlacementController.IsPlacing</c> each frame
+    /// and toggles the projector accordingly. When sized correctly the projector size
+    /// matches <c>buildRange * 2</c> (diameter).</para>
+    /// </remarks>
+    public class BuildRangeIndicator : MonoBehaviour
+    {
+        [Tooltip("DecalProjector child component to drive. Auto-found in Awake if empty.")]
+        [SerializeField] private DecalProjector projector;
+
+        [Tooltip("Vertical thickness of the decal projector's projection volume. Should " +
+                 "exceed your map's vertical range so the decal projects onto terrain at any height.")]
+        [SerializeField] private float projectionDepth = 50f;
+
+        // Cached references resolved lazily.
+        private Builder cachedBuilder;
+        private TowerPlacementController cachedPlacementController;
+
+        // ----- Lifecycle --------------------------------------------------
+
+        private void Awake()
+        {
+            if (projector == null) projector = GetComponentInChildren<DecalProjector>();
+            if (projector == null)
+            {
+                Debug.LogError("[BuildRangeIndicator] No DecalProjector found. Add one as a " +
+                               "child of this GameObject.");
+                enabled = false;
+                return;
+            }
+
+            // Start hidden; visibility is updated each frame.
+            projector.enabled = false;
+        }
+
+        private void Start()
+        {
+            cachedBuilder = GetComponentInParent<Builder>();
+            if (cachedBuilder == null)
+            {
+                Debug.LogError("[BuildRangeIndicator] No Builder found in parents. " +
+                               "Disabling indicator.");
+                enabled = false;
+                return;
+            }
+
+            // Hide for non-owners — other players don't see your range indicator.
+            if (!cachedBuilder.IsOwner)
+            {
+                enabled = false;
+                if (projector != null) projector.enabled = false;
+                return;
+            }
+
+            // Size the projector to match the builder's range (diameter = 2 * range).
+            // Modern URP DecalProjector exposes width/height/pivot as separate properties
+            // rather than a single Vector3 size. Width and Height are the ground-plane extents
+            // of the projection; pivot.z is the volume's depth offset (0 = volume centered
+            // on the projector position, projecting equally above and below).
+            float diameter = cachedBuilder.BuildRange * 2f;
+
+            // The DecalProjector exposes a `size` Vector3 on its API even though the
+            // inspector splits it into Width/Height/ProjectionDepth — assignment is still
+            // valid in current URP. We use it here to set all three at once.
+            projector.size = new Vector3(diameter, diameter, projectionDepth);
+            projector.pivot = new Vector3(0f, 0f, 0f);
+
+            // Center the projection volume on the builder. The decal projector projects
+            // along its local +Z axis by default; rotate to project downward (look down).
+            //
+            // CRITICAL: rotate the PROJECTOR's transform, not this component's transform.
+            // BuildRangeIndicator lives on the Builder root (so it can find Builder via
+            // GetComponentInParent), but `transform` here is the Builder's transform —
+            // rotating it tips the cylinder onto its side. The projector lives on a child
+            // GameObject; that's the one that needs the 90° X rotation.
+            projector.transform.localRotation = Quaternion.Euler(90f, 0f, 0f);
+            projector.transform.localPosition = Vector3.zero;
+        }
+
+        private void Update()
+        {
+            if (cachedBuilder == null) return;
+
+            bool shouldShow = IsLocalPlayerPlacing();
+            if (projector.enabled != shouldShow)
+                projector.enabled = shouldShow;
+        }
+
+        // ----- Helpers ----------------------------------------------------
+
+        private bool IsLocalPlayerPlacing()
+        {
+            if (cachedPlacementController == null)
+            {
+                cachedPlacementController =
+                    UnityEngine.Object.FindAnyObjectByType<TowerPlacementController>();
+                if (cachedPlacementController == null) return false;
+            }
+            return cachedPlacementController.IsPlacing;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs.meta b/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs.meta
new file mode 100644
index 0000000..a532ecf
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/BuildRangeIndicator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a65b1797079cf2d4e9de7b82e81f2283
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/Builder.cs b/Assets/_Project/Scripts/Gameplay/Builder.cs
new file mode 100644
index 0000000..805bd81
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/Builder.cs
@@ -0,0 +1,303 @@
+// Assets/_Project/Scripts/Gameplay/Builder.cs
+using System.Collections.Generic;
+using Unity.Netcode;
+using UnityEngine;
+using TD.Core;
+using TD.Levels;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Per-player avatar that gates tower placement by proximity. Server-authoritative
+    /// position; clients submit move requests via Rpc and the server validates and applies.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Pure visual avatar.</b> Builders have no collider for gameplay purposes —
+    /// they don't block enemies, can't be attacked, and aren't selected as targets. They
+    /// are visible to all players but only their owner can move them.</para>
+    ///
+    /// <para><b>Terrain-aware height.</b> Each frame the server casts a ray straight down
+    /// from the builder against the <see cref="terrainLayerMask"/> and sets Y to
+    /// <c>hit.point.y + heightOffset</c>. If the ray misses, falls back to the buildable
+    /// plane Y. Towers are not on the terrain layer, so they don't influence height.</para>
+    ///
+    /// <para><b>Range gating.</b> <see cref="IsTileWithinBuildRange"/> is the public query
+    /// that <c>TowerPlacementManager</c> uses to validate placement requests. Builder range
+    /// is measured center-of-builder to center-of-anchor-tile in world units.</para>
+    ///
+    /// <para><b>Static registry.</b> Like <see cref="PlayerGoldManager"/>, builders register
+    /// themselves in a static dictionary keyed by <c>OwnerClientId</c> on spawn, so server
+    /// gameplay code (notably <c>TowerPlacementManager</c>) can find a player's builder without
+    /// scene traversal.</para>
+    /// </remarks>
+    [RequireComponent(typeof(NetworkObject))]
+    public class Builder : NetworkBehaviour
+    {
+        // ----- Static registry --------------------------------------------
+
+        private static readonly Dictionary<ulong, Builder> s_byClientId
+            = new Dictionary<ulong, Builder>();
+
+        /// <summary>
+        /// Returns the Builder owned by the given client, or null if none is currently spawned.
+        /// Safe to call on server or client.
+        /// </summary>
+        public static Builder GetForClient(ulong clientId)
+        {
+            s_byClientId.TryGetValue(clientId, out var builder);
+            return builder;
+        }
+
+        /// <summary>
+        /// Convenience: the local client's own builder. Returns null on a dedicated server
+        /// or before the local player has spawned.
+        /// </summary>
+        public static Builder Local
+        {
+            get
+            {
+                var nm = NetworkManager.Singleton;
+                if (nm == null || !nm.IsClient) return null;
+                return GetForClient(nm.LocalClientId);
+            }
+        }
+
+        // ----- Inspector --------------------------------------------------
+
+        [Header("Movement")]
+        [Tooltip("Speed at which the builder moves toward its target position, in world " +
+                 "units per second.")]
+        [SerializeField] private float moveSpeed = 8f;
+
+        [Tooltip("Distance below which the builder is considered to have arrived at its " +
+                 "target. Smaller = more precise but more jitter; larger = less precise " +
+                 "but smoother.")]
+        [SerializeField] private float arrivalThreshold = 0.05f;
+
+        [Header("Height tracking")]
+        [Tooltip("Vertical offset above the terrain at which the builder hovers. " +
+                 "Re-evaluated every server tick by raycasting straight down.")]
+        [SerializeField] private float heightOffset = 2f;
+
+        [Tooltip("Maximum distance to cast downward when sampling terrain height. Should " +
+                 "exceed your map's vertical range.")]
+        [SerializeField] private float terrainRaycastMaxDistance = 100f;
+
+        [Tooltip("Physics layer mask used for terrain height sampling. Towers MUST NOT be " +
+                 "on this layer — only ground geometry. Falls back to the buildable plane Y " +
+                 "if no terrain hit.")]
+        [SerializeField] private LayerMask terrainLayerMask;
+
+        [Header("Build range")]
+        [Tooltip("Maximum distance from the builder's center to a tower's anchor tile center " +
+                 "for placement to be allowed, measured in world units (== tiles).")]
+        [SerializeField] private float buildRange = 6f;
+
+        // ----- Networked state --------------------------------------------
+
+        // Server-authoritative target position. The server moves the builder toward this
+        // each frame; clients render the builder smoothly via NetworkTransform's interpolation.
+        // We replicate the target (not the live position) so the server's intent is visible
+        // to clients, but the rendered position is whatever NetworkTransform interpolates to.
+        private readonly NetworkVariable<Vector3> targetPosition = new NetworkVariable<Vector3>(
+            value: Vector3.zero,
+            readPerm: NetworkVariableReadPermission.Everyone,
+            writePerm: NetworkVariableWritePermission.Server);
+
+        // ----- Public accessors -------------------------------------------
+
+        /// <summary>The builder's current world position (its actual transform position,
+        /// not the target).</summary>
+        public Vector3 CurrentPosition => transform.position;
+
+        /// <summary>The builder's target position. Server moves toward this each frame.</summary>
+        public Vector3 TargetPosition => targetPosition.Value;
+
+        /// <summary>True if the builder has arrived at its target (within
+        /// <see cref="arrivalThreshold"/>).</summary>
+        public bool IsAtTarget =>
+            Vector3.SqrMagnitude(transform.position - targetPosition.Value)
+            < arrivalThreshold * arrivalThreshold;
+
+        /// <summary>Build range in world units.</summary>
+        public float BuildRange => buildRange;
+
+        // ----- Lifecycle --------------------------------------------------
+
+        public override void OnNetworkSpawn()
+        {
+            s_byClientId[OwnerClientId] = this;
+
+            if (IsServer)
+            {
+                // Set initial target = current position so the builder doesn't drift on spawn.
+                // The spawner is responsible for placing this builder at a sensible position
+                // BEFORE Spawn() — see PlayerSpawnHelper / Player.OnNetworkSpawn.
+                targetPosition.Value = transform.position;
+                Debug.Log($"[Builder] Spawned for client {OwnerClientId} at " +
+                          $"{transform.position}.");
+            }
+
+            ApplyOwnerColor();
+        }
+
+        // ----- Owner color tinting ----------------------------------------
+
+        // Lazily allocated; reused across renderers. Construction in a field initializer
+        // would throw on this MonoBehaviour at scene load.
+        private MaterialPropertyBlock colorPropertyBlock;
+        // Both _Color (legacy Standard) and _BaseColor (URP Lit) — writing both lets the
+        // tint apply regardless of which shader the prefab uses. Unknown property writes
+        // are silently ignored by the shader.
+        private static readonly int ColorPropertyId = Shader.PropertyToID("_Color");
+        private static readonly int BaseColorPropertyId = Shader.PropertyToID("_BaseColor");
+
+        private void ApplyOwnerColor()
+        {
+            // Owner color comes from the slot mapping. Same stub mapping as elsewhere —
+            // replaced when MatchState lands.
+            byte slotByte = (byte)(OwnerClientId + 1);
+            PlayerSlot slot = (slotByte >= 1 && slotByte <= 9) ? (PlayerSlot)slotByte : PlayerSlot.None;
+
+            Color c = PlayerColors.Get(slot);
+            c.a = 1f;
+
+            colorPropertyBlock ??= new MaterialPropertyBlock();
+            colorPropertyBlock.SetColor(ColorPropertyId, c);
+            colorPropertyBlock.SetColor(BaseColorPropertyId, c);
+
+            foreach (var rend in GetComponentsInChildren<MeshRenderer>())
+                rend.SetPropertyBlock(colorPropertyBlock);
+        }
+
+        public override void OnNetworkDespawn()
+        {
+            if (s_byClientId.TryGetValue(OwnerClientId, out var registered) && registered == this)
+                s_byClientId.Remove(OwnerClientId);
+        }
+
+        // ----- Per-frame movement (server only) ---------------------------
+
+        private void Update()
+        {
+            if (!IsServer) return;
+
+            // Move toward target on the XZ plane.
+            Vector3 current = transform.position;
+            Vector3 target = targetPosition.Value;
+
+            // Flatten to XZ for distance/movement calculations; Y is driven by terrain raycast.
+            Vector3 currentXZ = new Vector3(current.x, 0f, current.z);
+            Vector3 targetXZ = new Vector3(target.x, 0f, target.z);
+
+            Vector3 newXZ;
+            if (Vector3.SqrMagnitude(currentXZ - targetXZ) <= arrivalThreshold * arrivalThreshold)
+            {
+                newXZ = targetXZ;
+            }
+            else
+            {
+                newXZ = Vector3.MoveTowards(currentXZ, targetXZ, moveSpeed * Time.deltaTime);
+            }
+
+            // Resolve Y from terrain.
+            float groundY = SampleTerrainY(new Vector3(newXZ.x, 0f, newXZ.z));
+            transform.position = new Vector3(newXZ.x, groundY + heightOffset, newXZ.z);
+        }
+
+        /// <summary>
+        /// Casts a ray straight down at <paramref name="xzPos"/> and returns the hit Y, or
+        /// <see cref="GridCoordinates.BUILDABLE_PLANE_Y"/> if nothing was hit on the
+        /// terrain layer.
+        /// </summary>
+        private float SampleTerrainY(Vector3 xzPos)
+        {
+            // Ray origin: high above the map. terrainRaycastMaxDistance defines how far to cast.
+            Vector3 origin = new Vector3(xzPos.x, terrainRaycastMaxDistance, xzPos.z);
+            if (Physics.Raycast(origin, Vector3.down, out RaycastHit hit,
+                                terrainRaycastMaxDistance * 2f, terrainLayerMask))
+            {
+                return hit.point.y;
+            }
+
+            // Fallback: builder hovers above the buildable plane.
+            return GridCoordinates.BUILDABLE_PLANE_Y;
+        }
+
+        // ----- Server move API --------------------------------------------
+
+        /// <summary>
+        /// Server-side entry point: directly sets the move target. Called by the input
+        /// controller's Rpc handler after validation. Out-of-map positions are clamped
+        /// to the current position (no-op).
+        /// </summary>
+        public void ServerSetMoveTarget(Vector3 worldPos)
+        {
+            if (!IsServer)
+            {
+                Debug.LogError("[Builder] ServerSetMoveTarget called on a client.");
+                return;
+            }
+
+            // Clamp to map area: convert XZ to a tile and check IsInMap.
+            var loader = LevelLoader.Instance;
+            if (loader != null && loader.IsLoaded)
+            {
+                Vector2Int tile = GridCoordinates.WorldToGrid(worldPos);
+                if (!loader.IsInMap(tile))
+                {
+                    // Out-of-map move requests are rejected silently. Could log if useful for
+                    // debugging client/server mismatch, but otherwise this is normal.
+                    return;
+                }
+            }
+
+            // Y is overwritten by terrain raycast each Update; we only honor X and Z here.
+            targetPosition.Value = new Vector3(worldPos.x, 0f, worldPos.z);
+        }
+
+        // ----- Owner-only move RPC ----------------------------------------
+
+        /// <summary>
+        /// Owner-only Rpc: a client requests their builder move to a world position.
+        /// Server validates (in-map check) and applies via <see cref="ServerSetMoveTarget"/>.
+        /// </summary>
+        [Rpc(SendTo.Server, InvokePermission = RpcInvokePermission.Owner)]
+        public void RequestMoveRpc(Vector3 worldPos)
+        {
+            ServerSetMoveTarget(worldPos);
+        }
+
+        // ----- Range query (used by TowerPlacementManager) ----------------
+
+        /// <summary>
+        /// True if the tower with the given anchor and footprint size is within build range
+        /// of this builder's CURRENT position. Range is measured from builder center to the
+        /// nearest point of the tower footprint, in world units.
+        /// </summary>
+        /// <remarks>
+        /// "Nearest point of the footprint" rather than "footprint center" so that a tower
+        /// is reachable when ANY of its tiles is within range, even if the center is
+        /// slightly outside. Aligns with player intuition that "I can reach this tile."
+        /// </remarks>
+        public bool IsTileWithinBuildRange(Vector2Int anchor, Vector2Int footprintSize)
+        {
+            Vector3 builderXZ = new Vector3(transform.position.x, 0f, transform.position.z);
+
+            // Find the point on the footprint rectangle nearest to the builder.
+            float minX = anchor.x * GridCoordinates.TILE_SIZE - GridCoordinates.TILE_SIZE * 0.5f;
+            float maxX = (anchor.x + footprintSize.x - 1) * GridCoordinates.TILE_SIZE
+                         + GridCoordinates.TILE_SIZE * 0.5f;
+            float minZ = anchor.y * GridCoordinates.TILE_SIZE - GridCoordinates.TILE_SIZE * 0.5f;
+            float maxZ = (anchor.y + footprintSize.y - 1) * GridCoordinates.TILE_SIZE
+                         + GridCoordinates.TILE_SIZE * 0.5f;
+
+            float nearestX = Mathf.Clamp(builderXZ.x, minX, maxX);
+            float nearestZ = Mathf.Clamp(builderXZ.z, minZ, maxZ);
+            Vector3 nearestPoint = new Vector3(nearestX, 0f, nearestZ);
+
+            return Vector3.SqrMagnitude(builderXZ - nearestPoint)
+                   <= buildRange * buildRange;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/Builder.cs.meta b/Assets/_Project/Scripts/Gameplay/Builder.cs.meta
new file mode 100644
index 0000000..e069441
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/Builder.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 05b2c04367f8c864bb5e3e03ba42dde5
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs b/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs
new file mode 100644
index 0000000..e26313a
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs
@@ -0,0 +1,121 @@
+// Assets/_Project/Scripts/Gameplay/BuilderInputController.cs
+using Unity.Netcode;
+using UnityEngine;
+using UnityEngine.InputSystem;
+using TD.Core;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Owner-only client-side controller for builder input. Handles right-click-to-move,
+    /// deferring to placement mode (right-click cancels placement instead).
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Owner-only.</b> This component lives on the same GameObject as
+    /// <see cref="Builder"/> but only its owning client processes input. Non-owner clients
+    /// have this component but its Update is a no-op. The owner sends move requests via
+    /// <see cref="Builder.RequestMoveRpc"/>.</para>
+    ///
+    /// <para><b>Right-click priority.</b> If <c>TowerPlacementController.IsPlacing</c> is
+    /// true, right-click cancels placement (handled by <c>TowerPlacementController</c>
+    /// itself). When NOT placing, right-click moves the builder.</para>
+    ///
+    /// <para><b>Raycast target.</b> The cursor is raycast against the BuildablePlane layer
+    /// (same as placement). The hit point's XZ is sent as the target; Y is recomputed by
+    /// the server via terrain raycast.</para>
+    /// </remarks>
+    public class BuilderInputController : NetworkBehaviour
+    {
+        // ----- Inspector --------------------------------------------------
+
+        [Tooltip("Physics layer mask for the BuildablePlane collider. Cursor is raycast " +
+                 "against this layer to determine the move target.")]
+        [SerializeField] private LayerMask buildablePlaneLayerMask;
+
+        [Tooltip("Maximum raycast distance for cursor → world conversion.")]
+        [SerializeField] private float raycastMaxDistance = 500f;
+
+        // Cached reference to the sibling Builder component.
+        private Builder builder;
+
+        // Cached reference to the local TowerPlacementController, looked up lazily because
+        // it may not exist at OnNetworkSpawn time.
+        private TowerPlacementController cachedPlacementController;
+
+        // ----- Lifecycle --------------------------------------------------
+
+        public override void OnNetworkSpawn()
+        {
+            builder = GetComponent<Builder>();
+            if (builder == null)
+            {
+                Debug.LogError("[BuilderInputController] Missing Builder component on the " +
+                               "same GameObject. Disabling input.");
+                enabled = false;
+                return;
+            }
+
+            // Non-owners do nothing.
+            if (!IsOwner)
+            {
+                enabled = false;
+            }
+        }
+
+        // ----- Input handling ---------------------------------------------
+
+        private void Update()
+        {
+            // Defensive: enabled is set false for non-owners in OnNetworkSpawn, but keep
+            // the IsOwner check here in case order-of-operations changes.
+            if (!IsOwner) return;
+
+            var mouse = Mouse.current;
+            if (mouse == null) return;
+
+            if (!mouse.rightButton.wasPressedThisFrame) return;
+
+            // Defer to placement mode: if the player is placing a tower, right-click cancels
+            // placement rather than moving the builder. TowerPlacementController handles
+            // the cancel itself; we just don't process the click here.
+            if (IsLocalPlayerPlacing()) return;
+
+            // Cursor → world.
+            if (!TryGetBuildablePlaneHit(mouse.position.ReadValue(), out Vector3 worldPoint))
+                return;
+
+            // Submit to server.
+            builder.RequestMoveRpc(worldPoint);
+        }
+
+        // ----- Helpers ----------------------------------------------------
+
+        private bool IsLocalPlayerPlacing()
+        {
+            if (cachedPlacementController == null)
+            {
+                // Find lazily — controller may have been added after this component spawned.
+                cachedPlacementController =
+                    UnityEngine.Object.FindAnyObjectByType<TowerPlacementController>();
+                if (cachedPlacementController == null) return false;
+            }
+            return cachedPlacementController.IsPlacing;
+        }
+
+        private bool TryGetBuildablePlaneHit(Vector2 screenPos, out Vector3 hitPoint)
+        {
+            hitPoint = Vector3.zero;
+
+            var cam = Camera.main;
+            if (cam == null) return false;
+
+            Ray ray = cam.ScreenPointToRay(new Vector3(screenPos.x, screenPos.y, 0f));
+            if (Physics.Raycast(ray, out RaycastHit hit, raycastMaxDistance, buildablePlaneLayerMask))
+            {
+                hitPoint = hit.point;
+                return true;
+            }
+            return false;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs.meta b/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs.meta
new file mode 100644
index 0000000..098e39e
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/BuilderInputController.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 85df68e96d71b3f4cb302a197a6a4e05
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/CameraController.cs b/Assets/_Project/Scripts/Gameplay/CameraController.cs
new file mode 100644
index 0000000..9b56e65
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/CameraController.cs
@@ -0,0 +1,459 @@
+// Assets/_Project/Scripts/Gameplay/CameraController.cs
+using UnityEngine;
+using UnityEngine.InputSystem;
+using TD.Core;
+using TD.Levels;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Per-client RTS-style camera controller. Lives on a "camera rig" GameObject (the pivot)
+    /// with a child <see cref="Camera"/> GameObject. The pivot tracks the focus point on the
+    /// buildable plane; the camera child orbits the pivot at a configurable pitch and dolly
+    /// distance. Yaw is fixed.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Rig math.</b> The pivot's world rotation is set to <c>(pitch, 0, 0)</c>. The
+    /// camera child sits at local position <c>(0, 0, -dolly)</c> with identity local rotation.
+    /// When the pivot rotates, the child's world position rotates with it, placing the camera
+    /// up-and-back from the pivot at the right angle to look down at it. At pitch 0° the camera
+    /// is horizontal (worm's-eye); at 90° it's directly overhead (top-down).</para>
+    ///
+    /// <para><b>Inputs.</b>
+    /// <list type="bullet">
+    ///   <item><b>WASD or Arrow keys</b> — pan the pivot across the buildable plane.</item>
+    ///   <item><b>Mouse near screen edge</b> — edge-pan, when enabled.</item>
+    ///   <item><b>Scroll wheel</b> — dolly zoom (cursor-anchored).</item>
+    ///   <item><b>Alt + Scroll wheel</b> — adjust pitch.</item>
+    /// </list></para>
+    ///
+    /// <para><b>Bounds clamping.</b> The pivot's tile is required to satisfy
+    /// <see cref="LevelLoader.IsInMap"/>. When a frame's combined movement would leave the map,
+    /// the controller tries each axis independently and applies whichever still lands in-map —
+    /// producing wall-sliding behavior. If the loader isn't ready yet, clamping is skipped.</para>
+    ///
+    /// <para><b>Speed scaling.</b> Pan speed scales linearly with the current dolly distance, so
+    /// zoomed-out panning covers more ground per second and zoomed-in panning is precise.</para>
+    ///
+    /// <para><b>Public API for minimap.</b> <see cref="JumpTo"/>, <see cref="BeginDrag"/>,
+    /// <see cref="UpdateDrag"/>, <see cref="EndDrag"/> exist so the minimap (when implemented)
+    /// can drive the camera without this controller knowing about it.</para>
+    /// </remarks>
+    public class CameraController : MonoBehaviour
+    {
+        // ----- Inspector --------------------------------------------------
+
+        [Header("Rig")]
+        [Tooltip("The camera GameObject that lives as a child of this rig pivot. " +
+                 "Auto-found via GetComponentInChildren if left empty.")]
+        [SerializeField] private Camera cameraChild;
+
+        [Header("Pan")]
+        [Tooltip("Base pan speed in world units per second at minimum zoom. " +
+                 "Effective speed scales linearly with current dolly distance.")]
+        [SerializeField] private float basePanSpeed = 12f;
+
+        [Tooltip("Distance in pixels from each screen edge that triggers edge-pan. " +
+                 "Smaller = needs precise mouse positioning; larger = activates more easily.")]
+        [SerializeField] private float edgePanMarginPixels = 16f;
+
+        [Tooltip("Whether edge-panning is enabled. Toggleable at runtime via " +
+                 "EdgePanEnabled property — wire this to a settings menu when one exists.")]
+        [SerializeField] private bool edgePanEnabled = true;
+
+        [Header("Zoom")]
+        [Tooltip("Closest zoom (smallest dolly distance from pivot to camera).")]
+        [SerializeField] private float minDollyDistance = 5f;
+
+        [Tooltip("Farthest zoom (largest dolly distance from pivot to camera).")]
+        [SerializeField] private float maxDollyDistance = 50f;
+
+        [Tooltip("Starting dolly distance at match start.")]
+        [SerializeField] private float startDollyDistance = 20f;
+
+        [Tooltip("Dolly distance change per scroll wheel tick (positive value; sign is " +
+                 "applied based on scroll direction). Tuned for ±1-per-click scroll input. " +
+                 "Adjust to taste.")]
+        [SerializeField] private float zoomSpeed = 3f;
+
+        [Tooltip("If true, zooming pulls the world toward the cursor — the screen point under " +
+                 "the cursor stays roughly anchored to the same world point. If false, zoom " +
+                 "centers on the screen midpoint.")]
+        [SerializeField] private bool cursorAnchoredZoom = true;
+
+        [Header("Pitch")]
+        [Tooltip("Minimum pitch angle in degrees. 0° is horizontal; 90° is top-down.")]
+        [SerializeField] private float minPitchDegrees = 30f;
+
+        [Tooltip("Maximum pitch angle in degrees. 0° is horizontal; 90° is top-down.")]
+        [SerializeField] private float maxPitchDegrees = 75f;
+
+        [Tooltip("Starting pitch angle at match start.")]
+        [SerializeField] private float startPitchDegrees = 60f;
+
+        [Tooltip("Pitch change in degrees per Alt+Scroll tick. Tuned for ±1-per-click scroll " +
+                 "input. Adjust to taste.")]
+        [SerializeField] private float pitchSpeed = 4f;
+
+        // ----- Runtime state ----------------------------------------------
+
+        private float currentDolly;
+        private float currentPitch;
+
+        // True between BeginDrag and EndDrag (minimap drag mode). Suppresses normal
+        // input handling so minimap-driven movement isn't fighting keyboard/edge-pan.
+        private bool isExternalDragActive;
+
+        // ----- Public API -------------------------------------------------
+
+        /// <summary>Whether edge-panning is currently active. Wire to settings UI.</summary>
+        public bool EdgePanEnabled
+        {
+            get => edgePanEnabled;
+            set => edgePanEnabled = value;
+        }
+
+        /// <summary>Snaps the pivot to <paramref name="worldPos"/>. Y is ignored. Used by the
+        /// minimap for click-to-jump.</summary>
+        public void JumpTo(Vector3 worldPos)
+        {
+            Vector3 newPivot = new Vector3(worldPos.x, GridCoordinates.BUILDABLE_PLANE_Y, worldPos.z);
+            TryMovePivotTo(newPivot);
+            ApplyTransform();
+        }
+
+        /// <summary>Begins external drag mode (e.g., from the minimap). Subsequent
+        /// <see cref="UpdateDrag"/> calls drive the pivot directly, bypassing keyboard/edge
+        /// input until <see cref="EndDrag"/>.</summary>
+        public void BeginDrag() => isExternalDragActive = true;
+
+        /// <summary>Updates the pivot to the dragged world position. Same effect as
+        /// <see cref="JumpTo"/> but intended to be called every frame during a drag.</summary>
+        public void UpdateDrag(Vector3 worldPos) => JumpTo(worldPos);
+
+        /// <summary>Ends external drag mode. Normal input handling resumes.</summary>
+        public void EndDrag() => isExternalDragActive = false;
+
+        // ----- Lifecycle --------------------------------------------------
+
+        private void Start()
+        {
+            if (cameraChild == null) cameraChild = GetComponentInChildren<Camera>();
+            if (cameraChild == null)
+            {
+                Debug.LogError("[CameraController] No child Camera found. Place a Camera as " +
+                               "a child of this GameObject or assign it in the inspector.");
+                enabled = false;
+                return;
+            }
+
+            currentDolly = Mathf.Clamp(startDollyDistance, minDollyDistance, maxDollyDistance);
+            currentPitch = Mathf.Clamp(startPitchDegrees, minPitchDegrees, maxPitchDegrees);
+
+            // Compute initial pivot position. Falls back to current transform if loader or
+            // local-player data isn't ready (e.g., editor preview before Start Host).
+            Vector3 startPivot = ComputeStartPivot(transform.position);
+            transform.position = startPivot;
+
+            ApplyTransform();
+        }
+
+        private void Update()
+        {
+            if (isExternalDragActive)
+            {
+                // Minimap or other external system is driving — don't fight it.
+                return;
+            }
+
+            HandleZoomAndPitch();
+            HandlePan();
+        }
+
+        // ----- Input handlers ---------------------------------------------
+
+        private void HandlePan()
+        {
+            Vector2 dir = Vector2.zero;
+
+            // Keyboard: WASD + arrow keys
+            var kb = Keyboard.current;
+            if (kb != null)
+            {
+                if (kb.aKey.isPressed || kb.leftArrowKey.isPressed) dir.x -= 1f;
+                if (kb.dKey.isPressed || kb.rightArrowKey.isPressed) dir.x += 1f;
+                if (kb.sKey.isPressed || kb.downArrowKey.isPressed) dir.y -= 1f;
+                if (kb.wKey.isPressed || kb.upArrowKey.isPressed) dir.y += 1f;
+            }
+
+            // Edge-pan: mouse near screen edge adds to keyboard direction.
+            if (edgePanEnabled && Mouse.current != null)
+            {
+                Vector2 mousePos = Mouse.current.position.ReadValue();
+                if (mousePos.x <= edgePanMarginPixels) dir.x -= 1f;
+                if (mousePos.x >= Screen.width - edgePanMarginPixels) dir.x += 1f;
+                if (mousePos.y <= edgePanMarginPixels) dir.y -= 1f;
+                if (mousePos.y >= Screen.height - edgePanMarginPixels) dir.y += 1f;
+            }
+
+            if (dir.sqrMagnitude < 0.0001f) return;
+
+            // Normalize to prevent diagonal speed boost when both axes active.
+            if (dir.sqrMagnitude > 1f) dir.Normalize();
+
+            // Scale speed by current zoom: at min zoom multiplier=1, at max zoom multiplier
+            // is the ratio of max-to-min dolly distance.
+            float speedMultiplier = currentDolly / minDollyDistance;
+            float distance = basePanSpeed * speedMultiplier * Time.deltaTime;
+
+            // dir.x maps to world X, dir.y maps to world Z (since pivot is on XZ plane).
+            Vector3 desired = transform.position + new Vector3(dir.x, 0f, dir.y) * distance;
+            TryMovePivotTo(desired);
+            ApplyTransform();
+        }
+
+        private void HandleZoomAndPitch()
+        {
+            var mouse = Mouse.current;
+            var kb = Keyboard.current;
+            if (mouse == null) return;
+
+            // Scroll wheel values are inconsistent across platforms and devices:
+            //   - Windows click-wheel mice: ±120 per click (legacy Win32 convention)
+            //   - Free-spin wheels and trackpads: small fractional values per tick
+            //   - macOS / Linux mice: typically ±1 per click
+            // We use the raw value with no normalization. Speed defaults are tuned for
+            // ±1-per-click hardware (Steam Deck, macOS, many Linux/Windows mice). On
+            // ±120-per-click hardware, scroll naturally feels faster — which usually
+            // matches the "discrete tick" feel users expect from those mice anyway.
+            float scrollDelta = mouse.scroll.ReadValue().y;
+            if (Mathf.Abs(scrollDelta) < 0.0001f) return;
+
+            bool altHeld = kb != null &&
+                           (kb.leftAltKey.isPressed || kb.rightAltKey.isPressed);
+
+            if (altHeld)
+            {
+                // Alt + scroll: adjust pitch.
+                currentPitch = Mathf.Clamp(currentPitch - scrollDelta * pitchSpeed,
+                                           minPitchDegrees, maxPitchDegrees);
+                ApplyTransform();
+            }
+            else
+            {
+                // Plain scroll: dolly zoom. Negative scroll = zoom out.
+                ApplyZoom(scrollDelta * zoomSpeed, mouse.position.ReadValue());
+            }
+        }
+
+        // ----- Zoom with cursor anchor ------------------------------------
+
+        private void ApplyZoom(float zoomDelta, Vector2 cursorScreen)
+        {
+            if (!cursorAnchoredZoom)
+            {
+                currentDolly = Mathf.Clamp(currentDolly - zoomDelta,
+                                           minDollyDistance, maxDollyDistance);
+                ApplyTransform();
+                return;
+            }
+
+            // Cursor-anchored zoom:
+            //   1. Find the world point under the cursor BEFORE the zoom.
+            //   2. Apply zoom (changes dolly).
+            //   3. Find the world point under the cursor AFTER the zoom.
+            //   4. Translate the pivot by (before - after) so the cursor's world point stays put.
+
+            if (!TryGroundPlanePoint(cursorScreen, out Vector3 before))
+            {
+                // Cursor not over the ground plane — fall back to non-anchored zoom.
+                currentDolly = Mathf.Clamp(currentDolly - zoomDelta,
+                                           minDollyDistance, maxDollyDistance);
+                ApplyTransform();
+                return;
+            }
+
+            currentDolly = Mathf.Clamp(currentDolly - zoomDelta,
+                                       minDollyDistance, maxDollyDistance);
+            ApplyTransform();
+
+            if (!TryGroundPlanePoint(cursorScreen, out Vector3 after))
+            {
+                return;
+            }
+
+            Vector3 desiredPivot = transform.position + (before - after);
+            TryMovePivotTo(desiredPivot);
+            ApplyTransform();
+        }
+
+        // ----- Pivot movement with bounds clamping ------------------------
+
+        /// <summary>
+        /// Attempts to move the pivot to <paramref name="desired"/>. If the new position would
+        /// leave the map, tries each axis independently and applies whichever still lands in
+        /// the map (wall-sliding). If neither axis works, the pivot doesn't move.
+        /// </summary>
+        private void TryMovePivotTo(Vector3 desired)
+        {
+            // If LevelLoader isn't loaded, accept the move as-is (editor preview, early frames).
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded)
+            {
+                transform.position = new Vector3(desired.x, GridCoordinates.BUILDABLE_PLANE_Y, desired.z);
+                return;
+            }
+
+            Vector3 current = transform.position;
+
+            if (IsPositionInMap(loader, desired))
+            {
+                transform.position = new Vector3(desired.x, GridCoordinates.BUILDABLE_PLANE_Y, desired.z);
+                return;
+            }
+
+            // Try X-only move (slide along the Z wall).
+            Vector3 xOnly = new Vector3(desired.x, current.y, current.z);
+            if (IsPositionInMap(loader, xOnly))
+            {
+                transform.position = new Vector3(xOnly.x, GridCoordinates.BUILDABLE_PLANE_Y, xOnly.z);
+                return;
+            }
+
+            // Try Z-only move (slide along the X wall).
+            Vector3 zOnly = new Vector3(current.x, current.y, desired.z);
+            if (IsPositionInMap(loader, zOnly))
+            {
+                transform.position = new Vector3(zOnly.x, GridCoordinates.BUILDABLE_PLANE_Y, zOnly.z);
+                return;
+            }
+
+            // Both axes blocked — don't move.
+        }
+
+        private static bool IsPositionInMap(LevelLoader loader, Vector3 worldPos)
+        {
+            Vector2Int tile = GridCoordinates.WorldToGrid(worldPos);
+            return loader.IsInMap(tile);
+        }
+
+        // ----- Transform composition --------------------------------------
+
+        /// <summary>
+        /// Applies <see cref="currentPitch"/> to the pivot rotation and
+        /// <see cref="currentDolly"/> to the camera's local Z offset. Yaw stays at 0.
+        /// </summary>
+        private void ApplyTransform()
+        {
+            transform.rotation = Quaternion.Euler(currentPitch, 0f, 0f);
+            cameraChild.transform.localPosition = new Vector3(0f, 0f, -currentDolly);
+            cameraChild.transform.localRotation = Quaternion.identity;
+        }
+
+        // ----- Ground-plane raycast helper --------------------------------
+
+        /// <summary>
+        /// Casts a ray from the camera through <paramref name="screenPos"/> against the
+        /// buildable plane (Y = <see cref="GridCoordinates.BUILDABLE_PLANE_Y"/>). Returns
+        /// false if the ray is parallel to the plane or the cursor is above the horizon.
+        /// </summary>
+        private bool TryGroundPlanePoint(Vector2 screenPos, out Vector3 worldPos)
+        {
+            worldPos = default;
+            Ray ray = cameraChild.ScreenPointToRay(new Vector3(screenPos.x, screenPos.y, 0f));
+
+            Plane ground = new Plane(Vector3.up, new Vector3(0f, GridCoordinates.BUILDABLE_PLANE_Y, 0f));
+            if (!ground.Raycast(ray, out float enter)) return false;
+
+            worldPos = ray.GetPoint(enter);
+            return true;
+        }
+
+        // ----- Initial position -------------------------------------------
+
+        /// <summary>
+        /// Computes the initial pivot position as the centroid of the local player's owned
+        /// tiles. Falls back to the map center, and finally to <paramref name="fallback"/>
+        /// (the rig's authoring-time position) if neither is available yet.
+        /// </summary>
+        private Vector3 ComputeStartPivot(Vector3 fallback)
+        {
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded) return fallback;
+
+            PlayerSlot localSlot = GetLocalPlayerSlot();
+
+            if (localSlot != PlayerSlot.None)
+            {
+                if (TryComputeZoneCentroid(loader, localSlot, out Vector3 centroid))
+                    return centroid;
+            }
+
+            // Fall back to map center.
+            return ComputeMapCenter(loader.LevelData);
+        }
+
+        private static bool TryComputeZoneCentroid(LevelLoader loader, PlayerSlot slot,
+                                                   out Vector3 centroid)
+        {
+            centroid = default;
+
+            var levelData = loader.LevelData;
+            if (levelData == null || levelData.OwnerGrid == null) return false;
+
+            // Sum the world positions of every tile owned by this slot.
+            // Using Vector2 sums to avoid Y precision drift.
+            Vector2 sum = Vector2.zero;
+            int count = 0;
+
+            for (int y = 0; y < levelData.GridSize.y; y++)
+            {
+                for (int x = 0; x < levelData.GridSize.x; x++)
+                {
+                    int idx = y * levelData.GridSize.x + x;
+                    if (levelData.OwnerGrid[idx] != slot) continue;
+
+                    Vector2Int tile = new Vector2Int(
+                        levelData.GridOriginTile.x + x,
+                        levelData.GridOriginTile.y + y);
+                    Vector3 world = GridCoordinates.GridToWorld(tile);
+                    sum.x += world.x;
+                    sum.y += world.z;
+                    count++;
+                }
+            }
+
+            if (count == 0) return false;
+
+            centroid = new Vector3(sum.x / count, GridCoordinates.BUILDABLE_PLANE_Y, sum.y / count);
+            return true;
+        }
+
+        private static Vector3 ComputeMapCenter(LevelData levelData)
+        {
+            if (levelData == null) return Vector3.zero;
+            float cx = (levelData.GridOriginTile.x + (levelData.GridSize.x - 1) * 0.5f)
+                     * GridCoordinates.TILE_SIZE;
+            float cz = (levelData.GridOriginTile.y + (levelData.GridSize.y - 1) * 0.5f)
+                     * GridCoordinates.TILE_SIZE;
+            return new Vector3(cx, GridCoordinates.BUILDABLE_PLANE_Y, cz);
+        }
+
+        // ----- Player slot ------------------------------------------------
+
+        /// <summary>
+        /// Returns the local player's PlayerSlot.
+        /// STUB: same trivial mapping used elsewhere; replaced when MatchState lands.
+        /// </summary>
+        private static PlayerSlot GetLocalPlayerSlot()
+        {
+            var nm = Unity.Netcode.NetworkManager.Singleton;
+            if (nm == null || !nm.IsClient) return PlayerSlot.None;
+
+            ulong clientId = nm.LocalClientId;
+            byte slotByte = (byte)(clientId + 1);
+            if (slotByte < 1 || slotByte > 9) return PlayerSlot.None;
+            return (PlayerSlot)slotByte;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/CameraController.cs.meta b/Assets/_Project/Scripts/Gameplay/CameraController.cs.meta
new file mode 100644
index 0000000..882c598
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/CameraController.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 1e670a36689801e428873c5712ea3679
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/LevelLoader.cs b/Assets/_Project/Scripts/Gameplay/LevelLoader.cs
index b515909..bfa8fe0 100644
--- a/Assets/_Project/Scripts/Gameplay/LevelLoader.cs
+++ b/Assets/_Project/Scripts/Gameplay/LevelLoader.cs
@@ -74,15 +74,30 @@ namespace TD.Gameplay
 
         // The mutable walkability grid. Initialized from LevelData.WalkabilityGrid
         // and mutated by tower placement at runtime. Stays in lockstep with the
-        // baked grid until towers are placed (none yet, since tower placement
-        // isn't implemented).
+        // baked grid until towers are placed.
         //
-        // This is intentionally NOT exposed through a property yet -- consumers
-        // will query through IsWalkable(Vector2Int) instead, hiding the array
-        // indexing. When tower placement needs to mutate it, we'll expose a
-        // SetWalkable method then. Easier to add than to take away.
+        // Consumers query through IsWalkable(Vector2Int) and mutate through
+        // SetWalkable(Vector2Int, bool), which hide the flat-array indexing.
+        //
+        // NOTE: This grid will move to MatchState when that NetworkBehaviour is
+        // implemented, so server-authoritative mutation is co-located with other
+        // match-wide state. For now it lives here because no consumer needed it
+        // to live elsewhere.
         private bool[] runtimeWalkability;
 
+        // Per-tile tower occupancy. True when a tower's footprint covers this tile.
+        // Distinct from runtimeWalkability because:
+        //   (a) spawner and leak-exit tiles are walkable but can never be occupied
+        //       by a tower — tracking them separately avoids ambiguity.
+        //   (b) the placement ghost needs to detect tile conflicts independently
+        //       of walkability (a tile is walkable until the tower is placed,
+        //       but the ghost should turn red as soon as a prior placement
+        //       reserves it).
+        //
+        // Initialized to all-false on Awake. Mutated via SetOccupied; queried
+        // via IsOccupied. Will move to MatchState alongside runtimeWalkability.
+        private bool[] runtimeOccupied;
+
         // The buildable-plane GameObject we instantiated as our child.
         // Cached for inspector debugging and future destruction.
         private GameObject buildablePlaneGO;
@@ -113,6 +128,7 @@ namespace TD.Gameplay
             }
 
             InitializeRuntimeWalkability();
+            InitializeRuntimeOccupied();
             SpawnBuildablePlane();
 
             IsLoaded = true;
@@ -190,6 +206,13 @@ namespace TD.Gameplay
                 level.WalkabilityGrid, runtimeWalkability, level.WalkabilityGrid.Length);
         }
 
+        private void InitializeRuntimeOccupied()
+        {
+            // All tiles start unoccupied. bool[] default-initializes to false,
+            // so Array.Clear is redundant but makes intent explicit.
+            runtimeOccupied = new bool[level.WalkabilityGrid.Length];
+        }
+
         private void SpawnBuildablePlane()
         {
             // Compute the world-space center and size of the grid.
@@ -314,6 +337,59 @@ namespace TD.Gameplay
             return level.OwnerGrid[idx];
         }
 
+        /// <summary>
+        /// True if <paramref name="tile"/> is currently occupied by a placed tower footprint.
+        /// Returns false for out-of-bounds tiles. Unlike <see cref="IsWalkable"/>, this grid
+        /// starts all-false and only becomes true when a tower is successfully placed.
+        /// </summary>
+        /// <remarks>
+        /// The placement ghost uses this (alongside <see cref="GetPlacement"/> and
+        /// <see cref="GetOwner"/>) to decide whether to render as valid (white) or invalid (red).
+        /// The server uses it as part of the tile-availability check before path validation.
+        /// </remarks>
+        public bool IsOccupied(Vector2Int tile)
+        {
+            if (!TryFlatIndex(tile, out int idx)) return false;
+            return runtimeOccupied[idx];
+        }
+
+        // ----- Runtime mutators -------------------------------------------
+        //
+        // Called by TowerPlacementManager (server-side) when a tower placement
+        // is accepted. Both mutators must be called for every tile in the tower's
+        // footprint so the two grids stay in sync.
+        //
+        // These are not RPCs — LevelLoader is a plain MonoBehaviour, not a
+        // NetworkBehaviour. The server calls these directly after authoritative
+        // validation; clients learn about the change when the TowerInstance
+        // NetworkObject spawns and its Start/OnNetworkSpawn stamps its own
+        // footprint locally.
+
+        /// <summary>
+        /// Sets the runtime walkability of <paramref name="tile"/>. Called by
+        /// <c>TowerPlacementManager</c> on the server when a tower is accepted (pass
+        /// <c>false</c>) and when a tower is sold/destroyed (pass <c>true</c>).
+        /// No-ops silently for out-of-bounds tiles.
+        /// </summary>
+        public void SetWalkable(Vector2Int tile, bool walkable)
+        {
+            if (!TryFlatIndex(tile, out int idx)) return;
+            runtimeWalkability[idx] = walkable;
+        }
+
+        /// <summary>
+        /// Sets the runtime occupancy of <paramref name="tile"/>. Called alongside
+        /// <see cref="SetWalkable"/> — always update both grids together so they
+        /// stay in sync. Pass <c>true</c> when a tower is placed, <c>false</c> when
+        /// it is sold or destroyed.
+        /// No-ops silently for out-of-bounds tiles.
+        /// </summary>
+        public void SetOccupied(Vector2Int tile, bool occupied)
+        {
+            if (!TryFlatIndex(tile, out int idx)) return;
+            runtimeOccupied[idx] = occupied;
+        }
+
         // Translates world-tile coordinates to a flat-array index, returning
         // false if the tile is out of bounds. Used by all query methods.
         private bool TryFlatIndex(Vector2Int tile, out int idx)
@@ -332,9 +408,9 @@ namespace TD.Gameplay
         // Gizmos run in both edit mode and play mode. In edit mode we use the
         // baked walkability/owner grids from the LevelData asset directly,
         // because runtimeWalkability hasn't been initialized yet. In play mode
-        // we use runtimeWalkability so the visualization reflects any future
-        // tower stamps. Owner and placement grids are immutable, so we read
-        // them from the asset in both modes.
+        // we use runtimeWalkability so the visualization reflects tower stamps.
+        // Owner and placement grids are immutable, so we read them from the
+        // asset in both modes.
 
         private void OnDrawGizmos()
         {
diff --git a/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs b/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs
new file mode 100644
index 0000000..6e3a0fa
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs
@@ -0,0 +1,141 @@
+// Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs
+using Unity.Netcode;
+using UnityEngine;
+using TD.Core;
+using TD.Levels;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Lives on the Player Prefab. On the server, when the player NetworkObject spawns,
+    /// instantiates and spawns a separate <see cref="Builder"/> NetworkObject owned by that
+    /// player. The builder is positioned at the centroid of the player's zone before spawn.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Why a separate NetworkObject?</b> Multi-builder races (Path E) become "spawn
+    /// N builder NetworkObjects" without restructuring the Player Prefab. See the design
+    /// discussion in Path D scoping.</para>
+    ///
+    /// <para><b>Server-only.</b> Spawning is server-authoritative. Non-server peers are
+    /// no-ops; they just receive the resulting Builder NetworkObject like any other
+    /// replicated spawn.</para>
+    ///
+    /// <para><b>Lifetime.</b> The spawned builder is destroyed when the player NetworkObject
+    /// despawns (e.g., disconnect). NGO does this automatically because we set
+    /// <c>destroyWithScene</c> and store no other references — the builder's despawn cleans
+    /// up the static registry in <see cref="Builder.OnNetworkDespawn"/>.</para>
+    /// </remarks>
+    public class PlayerBuilderSpawner : NetworkBehaviour
+    {
+        [Tooltip("Builder prefab to instantiate. Must be registered with the NetworkManager " +
+                 "as a network prefab.")]
+        [SerializeField] private GameObject builderPrefab;
+
+        // Cached reference so we can despawn the builder if needed (e.g., player disconnects).
+        private NetworkObject spawnedBuilder;
+
+        public override void OnNetworkSpawn()
+        {
+            if (!IsServer) return;
+
+            if (builderPrefab == null)
+            {
+                Debug.LogError("[PlayerBuilderSpawner] No Builder prefab assigned. " +
+                               "Cannot spawn builder for client " + OwnerClientId + ".");
+                return;
+            }
+
+            SpawnBuilderForOwner();
+        }
+
+        public override void OnNetworkDespawn()
+        {
+            // When the player despawns (disconnect), also despawn their builder if it still exists.
+            if (IsServer && spawnedBuilder != null && spawnedBuilder.IsSpawned)
+            {
+                spawnedBuilder.Despawn(destroy: true);
+            }
+            spawnedBuilder = null;
+        }
+
+        private void SpawnBuilderForOwner()
+        {
+            // Compute initial position: centroid of this player's zone.
+            // Falls back to origin if loader/zone data isn't available.
+            Vector3 spawnPos = ComputeZoneCentroid(OwnerToSlot(OwnerClientId));
+
+            var go = Instantiate(builderPrefab, spawnPos, Quaternion.identity);
+            var netObj = go.GetComponent<NetworkObject>();
+            if (netObj == null)
+            {
+                Debug.LogError("[PlayerBuilderSpawner] Builder prefab is missing a " +
+                               "NetworkObject component. Cannot spawn.");
+                Destroy(go);
+                return;
+            }
+
+            netObj.SpawnWithOwnership(OwnerClientId, destroyWithScene: true);
+            spawnedBuilder = netObj;
+
+            // Tell NetworkTransform to teleport to the spawn position, so clients don't
+            // interpolate from the prefab's authoring position (typically the origin) to
+            // the spawn position over the first few sync ticks. Without this, clients see
+            // the builder smoothly drift from world origin to its spawn point — which is
+            // exactly what we don't want for a brand-new spawn.
+            //
+            // Teleport sets a one-frame "no interpolation" flag that NetworkTransform
+            // honors on its next sync, so clients snap to the position instead.
+            var netTransform = go.GetComponent<Unity.Netcode.Components.NetworkTransform>();
+            if (netTransform != null)
+            {
+                netTransform.Teleport(spawnPos, Quaternion.identity, go.transform.localScale);
+            }
+        }
+
+        // ----- Helpers ----------------------------------------------------
+
+        /// <summary>
+        /// Stub mapping: client 0 = Player1, client 1 = Player2, etc.
+        /// Replaced by MatchState's authoritative assignment when that lands.
+        /// </summary>
+        private static PlayerSlot OwnerToSlot(ulong clientId)
+        {
+            byte slotByte = (byte)(clientId + 1);
+            if (slotByte < 1 || slotByte > 9) return PlayerSlot.None;
+            return (PlayerSlot)slotByte;
+        }
+
+        private static Vector3 ComputeZoneCentroid(PlayerSlot slot)
+        {
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded) return Vector3.zero;
+            if (slot == PlayerSlot.None) return Vector3.zero;
+
+            var levelData = loader.LevelData;
+            if (levelData == null || levelData.OwnerGrid == null) return Vector3.zero;
+
+            Vector2 sum = Vector2.zero;
+            int count = 0;
+
+            for (int y = 0; y < levelData.GridSize.y; y++)
+            {
+                for (int x = 0; x < levelData.GridSize.x; x++)
+                {
+                    int idx = y * levelData.GridSize.x + x;
+                    if (levelData.OwnerGrid[idx] != slot) continue;
+
+                    Vector2Int tile = new Vector2Int(
+                        levelData.GridOriginTile.x + x,
+                        levelData.GridOriginTile.y + y);
+                    Vector3 world = GridCoordinates.GridToWorld(tile);
+                    sum.x += world.x;
+                    sum.y += world.z;
+                    count++;
+                }
+            }
+
+            if (count == 0) return Vector3.zero;
+            return new Vector3(sum.x / count, GridCoordinates.BUILDABLE_PLANE_Y, sum.y / count);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs.meta b/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs.meta
new file mode 100644
index 0000000..e88bf80
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/PlayerBuilderSpawner.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0f4c46f8263f72541b0f782b446de941
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/PlayerGoldManager.cs b/Assets/_Project/Scripts/Gameplay/PlayerGoldManager.cs
index 65dfca6..b178ca8 100644
--- a/Assets/_Project/Scripts/Gameplay/PlayerGoldManager.cs
+++ b/Assets/_Project/Scripts/Gameplay/PlayerGoldManager.cs
@@ -143,6 +143,25 @@ namespace TD.Gameplay
             currentGold.Value += amount;
         }
 
+        /// <summary>
+        /// Server-side entry point for deducting gold (tower placement, other costs).
+        /// Direct call — not Rpc-wrapped — because deductions always originate from
+        /// server-authoritative validation (e.g., <c>TowerPlacementManager</c> after
+        /// all checks have passed). Clamps to zero; gold cannot go negative.
+        /// </summary>
+        public void DeductGold(int amount)
+        {
+            if (!IsServer)
+            {
+                Debug.LogError("[PlayerGoldManager] DeductGold called on a client. " +
+                               "Only server code should call this directly.");
+                return;
+            }
+
+            if (amount <= 0) return;
+            currentGold.Value = Mathf.Max(0, currentGold.Value - amount);
+        }
+
         // --- Server-side Rpc ---------------------------------------------
 
         // InvokePermission = Owner: only the client that owns this NetworkObject
@@ -175,4 +194,4 @@ namespace TD.Gameplay
             currentGold.Value -= amount;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerInstance.cs b/Assets/_Project/Scripts/Gameplay/TowerInstance.cs
new file mode 100644
index 0000000..ba5a535
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerInstance.cs
@@ -0,0 +1,273 @@
+// Assets/_Project/Scripts/Gameplay/TowerInstance.cs
+using Unity.Collections;
+using Unity.Netcode;
+using UnityEngine;
+using TD.Core;
+using TD.Towers;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Per-tower runtime component. Lives on the tower's NetworkObject prefab root.
+    ///
+    /// Responsibilities:
+    /// <list type="bullet">
+    ///   <item>Hold the network-replicated identity of this tower: which
+    ///         <see cref="TowerDefinition"/> it is and which <see cref="PlayerSlot"/> owns it.</item>
+    ///   <item>On <see cref="OnNetworkSpawn"/>, stamp the tower's footprint into
+    ///         <see cref="LevelLoader"/> on every client so local grids stay in sync
+    ///         with the server-authoritative state.</item>
+    ///   <item>Apply the owner's player color to the tower mesh, so towers are
+    ///         visually distinct by zone during testing.</item>
+    /// </list>
+    /// </remarks>
+    /// <remarks>
+    /// <para><b>Grid stamping split.</b> The server stamps the footprint in
+    /// <c>TowerPlacementManager.ProcessRequest</c> (before <c>NetworkObject.Spawn</c>)
+    /// so the path-validity check in the same frame sees the updated grid. Non-host
+    /// clients stamp in <see cref="OnNetworkSpawn"/> when NGO replicates the
+    /// NetworkObject to them. The server's <see cref="OnNetworkSpawn"/> also runs,
+    /// but by then the footprint is already stamped — <see cref="SetWalkable"/> and
+    /// <see cref="SetOccupied"/> are idempotent writes, so double-stamping is safe.</para>
+    ///
+    /// <para><b>Definition reference replication.</b> TowerDefinition assets live in the
+    /// project on all clients. We replicate the asset by name via a
+    /// <see cref="NetworkVariable{T}"/> holding a <c>FixedString64Bytes</c>, then look
+    /// up the asset locally. This avoids serializing the full ScriptableObject over the
+    /// network. The lookup uses a <see cref="TowerRegistry"/> singleton that must be
+    /// present in the scene. (Temporary: will be driven by RaceDefinition in Path E.)</para>
+    ///
+    /// <para><b>Combat.</b> No combat logic here yet. Combat fields live stubbed on
+    /// <see cref="TowerDefinition"/>; they will be consumed by a future
+    /// <c>TowerCombat</c> component added to the same prefab.</para>
+    /// </remarks>
+    [RequireComponent(typeof(NetworkObject))]
+    public class TowerInstance : NetworkBehaviour
+    {
+        // ----- Networked state ------------------------------------------------
+
+        // The name of the TowerDefinition asset for this tower. Replicated so all
+        // clients can look up the full definition locally without sending the whole
+        // ScriptableObject over the wire.
+        private readonly NetworkVariable<FixedString64Bytes> definitionName =
+            new NetworkVariable<FixedString64Bytes>(
+                default,
+                readPerm: NetworkVariableReadPermission.Everyone,
+                writePerm: NetworkVariableWritePermission.Server);
+
+        // The footprint anchor (SW corner, world-tile coords). Replicated so
+        // clients can stamp the correct tiles in OnNetworkSpawn.
+        private readonly NetworkVariable<Vector2Int> anchorTile =
+            new NetworkVariable<Vector2Int>(
+                default,
+                readPerm: NetworkVariableReadPermission.Everyone,
+                writePerm: NetworkVariableWritePermission.Server);
+
+        // The PlayerSlot that placed this tower. Replicated for the HUD context
+        // panel and for view-selection by non-owning clients.
+        private readonly NetworkVariable<PlayerSlot> ownerSlot =
+            new NetworkVariable<PlayerSlot>(
+                PlayerSlot.None,
+                readPerm: NetworkVariableReadPermission.Everyone,
+                writePerm: NetworkVariableWritePermission.Server);
+
+        // ----- Local resolved state -------------------------------------------
+
+        // Resolved on every client in OnNetworkSpawn from definitionName.
+        // Null if the lookup fails (missing TowerRegistry or unknown name).
+        private TowerDefinition resolvedDefinition;
+
+        // ----- Pre-spawn initialization data ----------------------------------
+        //
+        // Set by InitializeServer (called by TowerPlacementManager BEFORE Spawn).
+        // Read by the server's OnNetworkSpawn to populate the NetworkVariables.
+        //
+        // Why this two-step dance: NGO 2.x disallows writing NetworkVariables
+        // before NetworkObject.Spawn() — those writes produce warnings and may
+        // not replicate reliably. The supported pattern is to set NVs inside
+        // OnNetworkSpawn on the server; NGO captures those writes and includes
+        // them in the initial sync message sent to clients, so every client
+        // sees correct values on its very first OnNetworkSpawn callback.
+
+        private TowerDefinition pendingDefinition;
+        private Vector2Int pendingAnchor;
+        private PlayerSlot pendingOwner = PlayerSlot.None;
+        private bool hasPendingInit;
+
+        // ----- Public accessors -----------------------------------------------
+
+        /// <summary>The TowerDefinition for this tower, resolved locally. Null until
+        /// <see cref="OnNetworkSpawn"/> runs and the definition lookup succeeds.</summary>
+        public TowerDefinition Definition => resolvedDefinition;
+
+        /// <summary>The PlayerSlot that placed this tower.</summary>
+        public PlayerSlot Owner => ownerSlot.Value;
+
+        /// <summary>The footprint anchor tile (SW corner, world-tile coords).</summary>
+        public Vector2Int AnchorTile => anchorTile.Value;
+
+        // ----- Server-only initialization -------------------------------------
+
+        /// <summary>
+        /// Called by <c>TowerPlacementManager</c> on the server immediately after
+        /// instantiation and before <c>NetworkObject.Spawn</c>. Stores the data that
+        /// the server's <see cref="OnNetworkSpawn"/> will copy into the
+        /// NetworkVariables. NetworkVariables themselves are NOT written here —
+        /// see the comment on the pending-init fields above for why.
+        /// </summary>
+        public void InitializeServer(TowerDefinition def, Vector2Int anchor, PlayerSlot owner)
+        {
+            var nm = NetworkManager.Singleton;
+            if (nm == null || !nm.IsServer)
+            {
+                Debug.LogError("[TowerInstance] InitializeServer called when not running " +
+                               "as a server. This must only be called by " +
+                               "TowerPlacementManager on the server.");
+                return;
+            }
+
+            pendingDefinition = def;
+            pendingAnchor = anchor;
+            pendingOwner = owner;
+            hasPendingInit = true;
+
+            // Cache the resolved definition on the server immediately — clients
+            // will resolve via the registry lookup once definitionName arrives.
+            resolvedDefinition = def;
+        }
+
+        // ----- NGO lifecycle --------------------------------------------------
+
+        public override void OnNetworkSpawn()
+        {
+            // Server-only step: now that the NetworkObject is fully spawned,
+            // write the pending init values to the NetworkVariables. These writes
+            // will be captured in the initial sync message sent to clients, so
+            // every client sees correct values on its very first OnNetworkSpawn.
+            if (IsServer && hasPendingInit)
+            {
+                definitionName.Value = new FixedString64Bytes(pendingDefinition.name);
+                anchorTile.Value = pendingAnchor;
+                ownerSlot.Value = pendingOwner;
+
+                // Clear the pending data — it's now committed to NetworkVariables.
+                hasPendingInit = false;
+            }
+
+            // Resolve the TowerDefinition from the (now-available) replicated name.
+            // On the server this is already set by InitializeServer; the lookup is
+            // redundant but harmless and keeps the code path uniform.
+            ResolveDefinition();
+
+            // Stamp the footprint into the local LevelLoader grids.
+            // The server already stamped in TowerPlacementManager before Spawn(),
+            // but SetWalkable/SetOccupied are idempotent — double-stamping is safe.
+            StampFootprint(walkable: false, occupied: true);
+
+            // Apply owner color to the mesh renderer.
+            ApplyOwnerColor();
+
+            if (resolvedDefinition != null)
+            {
+                Debug.Log($"[TowerInstance] Spawned '{resolvedDefinition.DisplayName}' " +
+                          $"for {ownerSlot.Value} at anchor {anchorTile.Value}. " +
+                          $"IsServer={IsServer}");
+            }
+        }
+
+        public override void OnNetworkDespawn()
+        {
+            // Un-stamp the footprint when the tower is destroyed (sold, wave end, etc.)
+            // so the tiles become walkable and buildable again.
+            StampFootprint(walkable: true, occupied: false);
+        }
+
+        // ----- Private helpers ------------------------------------------------
+
+        private void ResolveDefinition()
+        {
+            // Already resolved (server path via InitializeServer).
+            if (resolvedDefinition != null) return;
+
+            string defName = definitionName.Value.ToString();
+            if (string.IsNullOrEmpty(defName))
+            {
+                Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
+                               $"definitionName is empty. Cannot resolve TowerDefinition.");
+                return;
+            }
+
+            var registry = TowerRegistry.Instance;
+            if (registry == null)
+            {
+                Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
+                               $"No TowerRegistry found in scene. Cannot resolve '{defName}'.");
+                return;
+            }
+
+            resolvedDefinition = registry.Get(defName);
+            if (resolvedDefinition == null)
+            {
+                Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
+                               $"TowerRegistry does not contain a definition named '{defName}'.");
+            }
+        }
+
+        private void StampFootprint(bool walkable, bool occupied)
+        {
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded)
+            {
+                Debug.LogWarning($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
+                                 $"LevelLoader not available during footprint stamp. " +
+                                 $"Grids may be out of sync.");
+                return;
+            }
+
+            // Determine footprint size from the resolved definition, falling back to
+            // 2×2 if the definition hasn't resolved yet (shouldn't happen, but defensive).
+            Vector2Int footprintSize = resolvedDefinition != null
+                ? resolvedDefinition.FootprintSize
+                : new Vector2Int(2, 2);
+
+            foreach (var tile in GridCoordinates.GetFootprintTiles(anchorTile.Value, footprintSize))
+            {
+                loader.SetWalkable(tile, walkable);
+                loader.SetOccupied(tile, occupied);
+            }
+        }
+
+        // Reused per-instance across color updates to avoid per-call GC allocation.
+        // MaterialPropertyBlock is not thread-safe but all rendering runs on the
+        // main thread, so a single instance per TowerInstance is fine.
+        private MaterialPropertyBlock colorPropertyBlock;
+        private static readonly int ColorPropertyId = Shader.PropertyToID("_Color");
+        // URP Lit uses _BaseColor, not _Color. Writing both ensures the tint applies
+        // regardless of which shader the prefab uses; unknown property writes are
+        // silently ignored.
+        private static readonly int BaseColorPropertyId = Shader.PropertyToID("_BaseColor");
+
+        private void ApplyOwnerColor()
+        {
+            Color ownerColor = PlayerColors.Get(ownerSlot.Value);
+            ownerColor.a = 1f;
+
+            // MaterialPropertyBlock sets per-renderer properties without allocating
+            // a new Material object. Safe to reuse across calls on the same instance.
+            // All Unity standard/URP shaders expose _Color or _BaseColor, so no shader changes needed.
+            colorPropertyBlock ??= new MaterialPropertyBlock();
+            colorPropertyBlock.SetColor(ColorPropertyId, ownerColor);
+            colorPropertyBlock.SetColor(BaseColorPropertyId, ownerColor);
+
+            var renderers = GetComponentsInChildren<MeshRenderer>();
+            foreach (var rend in renderers)
+                rend.SetPropertyBlock(colorPropertyBlock);
+
+            if (renderers.Length == 0)
+            {
+                Debug.LogWarning($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
+                                 $"No MeshRenderers found for owner color tinting.");
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerInstance.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerInstance.cs.meta
new file mode 100644
index 0000000..6ed6c73
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerInstance.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fb111fc88b3d6a340a3abde5a1502af3
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs b/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs
new file mode 100644
index 0000000..5797da7
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs
@@ -0,0 +1,421 @@
+// Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs
+using UnityEngine;
+using UnityEngine.InputSystem;
+using TD.Core;
+using TD.Towers;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Per-client controller for the tower placement UX. Handles hover raycasts against
+    /// the BuildablePlane collider, drives the placement ghost, and dispatches placement
+    /// requests to <see cref="TowerPlacementManager"/> via RPC.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Plain MonoBehaviour.</b> Placement visuals (ghost, cursor color) are
+    /// purely cosmetic and local. This component does not need to be a NetworkBehaviour.
+    /// All server-authoritative logic lives in <see cref="TowerPlacementManager"/>.</para>
+    ///
+    /// <para><b>Ghost validity check.</b> The ghost checks ownership, placement state,
+    /// and tile occupancy only. It does NOT run a local path check. If the server rejects
+    /// because the tower would block the path, the ghost disappears and a rejection
+    /// message is shown. This avoids the complexity of maintaining a client-side BFS
+    /// that may be slightly stale.</para>
+    ///
+    /// <para><b>Ghost colors.</b>
+    /// <list type="bullet">
+    ///   <item>White — all local checks pass.</item>
+    ///   <item>Red — any local check fails (wrong zone, not buildable, already occupied).</item>
+    /// </list>
+    /// Green "pending construction" ghost is a separate system implemented in Path D.</para>
+    ///
+    /// <para><b>Placement activation.</b> The controller is idle until
+    /// <see cref="BeginPlacement"/> is called (e.g., from a HUD tower button). The player
+    /// right-clicks or the placement is confirmed/rejected to return to idle.</para>
+    ///
+    /// <para><b>Input System.</b> Uses the New Input System package. Mouse position and
+    /// button state are read from <c>Mouse.current</c> each frame.</para>
+    ///
+    /// <para><b>Player slot.</b> The local player slot is currently a stub
+    /// (client 0 = Player1, etc.) matching <c>TowerPlacementManager.ClientIdToPlayerSlot</c>.
+    /// This will be replaced when MatchState carries the authoritative slot assignment.</para>
+    /// </remarks>
+    public class TowerPlacementController : MonoBehaviour
+    {
+        // ----- Inspector --------------------------------------------------
+
+        [Tooltip("Project-wide placement settings: ghost materials and rejection messages.")]
+        [SerializeField] private TowerPlacementSettings settings;
+
+        [Tooltip("Physics layer mask for the BuildablePlane collider. Set this to the " +
+                 "'BuildablePlane' layer. Raycasts only hit this layer so stray colliders " +
+                 "in the scene don't interfere.")]
+        [SerializeField] private LayerMask buildablePlaneLayerMask;
+
+        [Tooltip("Maximum raycast distance from the camera to the buildable plane. " +
+                 "Should be at least as large as the camera's far clip plane.")]
+        [SerializeField] private float raycastMaxDistance = 500f;
+
+        // ----- Active-placement state -------------------------------------
+
+        // Null when placement mode is inactive.
+        private TowerDefinition activeDef;
+        private int activeTowerTypeId;
+
+        // The ghost GameObject: the tower prefab instantiated with transparent materials.
+        // Null when placement mode is inactive.
+        private GameObject ghostGO;
+
+        // Cached renderers on the ghost, populated when the ghost is created.
+        private Renderer[] ghostRenderers = System.Array.Empty<Renderer>();
+
+        // Reused each frame to avoid allocation. Lazily constructed on first use because
+        // Unity disallows MaterialPropertyBlock construction in field initializers.
+        private MaterialPropertyBlock ghostPropertyBlock;
+        private static readonly int ColorPropertyId = Shader.PropertyToID("_Color");
+
+        // The anchor tile computed last frame (used to avoid re-evaluating when the
+        // cursor hasn't moved to a new tile).
+        private Vector2Int lastAnchor;
+        private bool lastAnchorValid;   // false until first raycast succeeds
+        private bool lastPlacementValid; // result of the last local validity check
+
+        // ----- Events -----------------------------------------------------
+
+        /// <summary>
+        /// Fired on the local client when the server rejects a placement request.
+        /// Payload is the human-readable rejection message from
+        /// <see cref="TowerPlacementSettings"/>. Subscribe here to display feedback UI.
+        /// </summary>
+        public static event System.Action<string> OnRejectionMessageReady;
+
+        // ----- Lifecycle --------------------------------------------------
+
+        private void OnEnable()
+        {
+            TowerPlacementManager.OnPlacementRejected += HandlePlacementRejected;
+        }
+
+        private void OnDisable()
+        {
+            TowerPlacementManager.OnPlacementRejected -= HandlePlacementRejected;
+            CancelPlacement();
+        }
+
+        private void Update()
+        {
+            if (activeDef == null) return;     // idle — nothing to do
+
+            var mouse = Mouse.current;
+            if (mouse == null) return;         // no mouse device connected
+
+            // Right-click cancels placement.
+            if (mouse.rightButton.wasPressedThisFrame)
+            {
+                CancelPlacement();
+                return;
+            }
+
+            // Raycast mouse position against the BuildablePlane.
+            if (!TryGetBuildablePlaneHit(mouse.position.ReadValue(), out Vector3 hitPoint))
+            {
+                // Cursor is off the buildable plane — hide the ghost but stay in
+                // placement mode so the player can move back onto the plane.
+                SetGhostVisible(false);
+                lastAnchorValid = false;
+                return;
+            }
+
+            SetGhostVisible(true);
+
+            // Compute the footprint anchor from the hit point.
+            Vector2Int anchor = ComputeAnchor(hitPoint, activeDef.FootprintSize);
+
+            // Position the ghost at the footprint center.
+            Vector3 ghostPos = GridCoordinates.GetFootprintCenterWorld(anchor, activeDef.FootprintSize);
+            ghostPos.y = 0.5f; // lift off the plane so the cube base sits flush
+            ghostGO.transform.position = ghostPos;
+
+            // Only re-evaluate validity when the anchor tile changes, to avoid
+            // re-running grid lookups every frame when the cursor is stationary.
+            if (!lastAnchorValid || anchor != lastAnchor)
+            {
+                lastAnchor = anchor;
+                lastAnchorValid = true;
+                lastPlacementValid = EvaluateLocalValidity(anchor, activeDef);
+            }
+
+            // Update ghost color.
+            ApplyGhostColor(lastPlacementValid);
+
+            // Left-click to attempt placement.
+            if (mouse.leftButton.wasPressedThisFrame)
+            {
+                TrySubmitPlacement(anchor);
+            }
+        }
+
+        // ----- Public API -------------------------------------------------
+
+        /// <summary>
+        /// Activates placement mode for the given tower type. The ghost appears
+        /// immediately under the cursor. Call this from HUD tower buttons.
+        /// </summary>
+        /// <param name="def">The TowerDefinition to place.</param>
+        /// <param name="towerTypeId">The type ID registered in
+        /// <see cref="TowerPlacementManager"/>.</param>
+        public void BeginPlacement(TowerDefinition def, int towerTypeId)
+        {
+            if (def == null)
+            {
+                Debug.LogError("[TowerPlacementController] BeginPlacement called with null " +
+                               "TowerDefinition.");
+                return;
+            }
+
+            // Cancel any existing placement before starting a new one.
+            CancelPlacement();
+
+            activeDef = def;
+            activeTowerTypeId = towerTypeId;
+
+            CreateGhost(def);
+        }
+
+        /// <summary>
+        /// Cancels placement mode and destroys the ghost. Safe to call when idle.
+        /// </summary>
+        public void CancelPlacement()
+        {
+            activeDef = null;
+            activeTowerTypeId = 0;
+            lastAnchorValid = false;
+
+            DestroyGhost();
+        }
+
+        /// <summary>
+        /// True when placement mode is currently active.
+        /// </summary>
+        public bool IsPlacing => activeDef != null;
+
+        // ----- Ghost management -------------------------------------------
+
+        private void CreateGhost(TowerDefinition def)
+        {
+            if (def.TowerPrefab == null)
+            {
+                Debug.LogWarning($"[TowerPlacementController] '{def.DisplayName}' has no " +
+                                 $"TowerPrefab — ghost cannot be created.");
+                return;
+            }
+
+            ghostGO = Instantiate(def.TowerPrefab);
+            ghostGO.name = $"Ghost_{def.name}";
+
+            // Disable all NetworkObject, TowerInstance, and Collider components on
+            // the ghost — it must not participate in networking or physics.
+            DisableGhostComponents();
+
+            ghostRenderers = ghostGO.GetComponentsInChildren<Renderer>();
+
+            // Apply ghost valid material to all renderers initially.
+            // ApplyGhostColor will update each frame.
+            if (settings != null && settings.GhostValidMaterial != null)
+            {
+                foreach (var rend in ghostRenderers)
+                    rend.sharedMaterial = settings.GhostValidMaterial;
+            }
+
+            // Start invisible; shown on the first successful raycast.
+            SetGhostVisible(false);
+        }
+
+        private void DestroyGhost()
+        {
+            if (ghostGO != null)
+            {
+                Destroy(ghostGO);
+                ghostGO = null;
+            }
+            ghostRenderers = System.Array.Empty<Renderer>();
+        }
+
+        private void SetGhostVisible(bool visible)
+        {
+            if (ghostGO != null)
+                ghostGO.SetActive(visible);
+        }
+
+        /// <summary>
+        /// Disables components on the ghost that must not run: NetworkObject,
+        /// TowerInstance, Colliders, and Rigidbodies. The ghost is purely visual.
+        /// </summary>
+        private void DisableGhostComponents()
+        {
+            // NetworkObject — must be disabled so NGO doesn't try to register it.
+            var netObj = ghostGO.GetComponent<Unity.Netcode.NetworkObject>();
+            if (netObj != null) netObj.enabled = false;
+
+            // TowerInstance — must not stamp grids or fire OnNetworkSpawn.
+            var towerInstance = ghostGO.GetComponent<TowerInstance>();
+            if (towerInstance != null) towerInstance.enabled = false;
+
+            // Colliders — ghost must not block raycasts or physics queries.
+            foreach (var col in ghostGO.GetComponentsInChildren<Collider>())
+                col.enabled = false;
+
+            // Rigidbodies — ghost must not fall or interact with physics.
+            foreach (var rb in ghostGO.GetComponentsInChildren<Rigidbody>())
+                rb.isKinematic = true;
+        }
+
+        /// <summary>
+        /// Sets the ghost material color using <see cref="MaterialPropertyBlock"/>.
+        /// Switches between valid (white) and invalid (red) materials.
+        /// </summary>
+        private void ApplyGhostColor(bool valid)
+        {
+            if (settings == null) return;
+
+            Material ghostMat = valid ? settings.GhostValidMaterial : settings.GhostInvalidMaterial;
+            if (ghostMat == null) return;
+
+            foreach (var rend in ghostRenderers)
+            {
+                rend.sharedMaterial = ghostMat;
+                // Property block is set empty here — color comes from the material itself.
+                // If the ghost materials use _Color, override it via the block instead:
+                // ghostPropertyBlock.SetColor(ColorPropertyId, valid ? Color.white : Color.red);
+                // rend.SetPropertyBlock(ghostPropertyBlock);
+            }
+        }
+
+        // ----- Raycasting -------------------------------------------------
+
+        private bool TryGetBuildablePlaneHit(Vector2 screenPos, out Vector3 hitPoint)
+        {
+            hitPoint = Vector3.zero;
+
+            var cam = Camera.main;
+            if (cam == null) return false;
+
+            Ray ray = cam.ScreenPointToRay(new Vector3(screenPos.x, screenPos.y, 0f));
+            if (Physics.Raycast(ray, out RaycastHit hit, raycastMaxDistance, buildablePlaneLayerMask))
+            {
+                hitPoint = hit.point;
+                return true;
+            }
+            return false;
+        }
+
+        // ----- Anchor computation -----------------------------------------
+
+        /// <summary>
+        /// Converts a world hit point to the footprint anchor tile (SW corner) such
+        /// that the footprint center is as close as possible to the hit point.
+        /// </summary>
+        /// <remarks>
+        /// For a 2×2 footprint: anchor = (Round(hitX - 0.5), Round(hitZ - 0.5))
+        /// For a 1×1 footprint: anchor = (Round(hitX), Round(hitZ))
+        /// For a 3×3 footprint: anchor = (Round(hitX - 1.0), Round(hitZ - 1.0))
+        /// </remarks>
+        private static Vector2Int ComputeAnchor(Vector3 hitPoint, Vector2Int footprintSize)
+        {
+            float t = GridCoordinates.TILE_SIZE;
+            float halfW = (footprintSize.x - 1) * 0.5f;
+            float halfH = (footprintSize.y - 1) * 0.5f;
+
+            int anchorX = Mathf.RoundToInt(hitPoint.x / t - halfW);
+            int anchorY = Mathf.RoundToInt(hitPoint.z / t - halfH);
+            return new Vector2Int(anchorX, anchorY);
+        }
+
+        // ----- Local validity check ---------------------------------------
+
+        /// <summary>
+        /// Evaluates the local (client-side) placement validity. Checks ownership,
+        /// placement state, and occupancy. Does NOT check gold or run a path BFS —
+        /// those are server-side only.
+        /// </summary>
+        private bool EvaluateLocalValidity(Vector2Int anchor, TowerDefinition def)
+        {
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded) return false;
+
+            PlayerSlot localSlot = GetLocalPlayerSlot();
+
+            foreach (var tile in GridCoordinates.GetFootprintTiles(anchor, def.FootprintSize))
+            {
+                if (loader.GetOwner(tile) != localSlot) return false;
+                if (loader.GetPlacement(tile) != PlacementState.Buildable) return false;
+                if (loader.IsOccupied(tile)) return false;
+            }
+
+            return true;
+        }
+
+        // ----- Placement submission ---------------------------------------
+
+        private void TrySubmitPlacement(Vector2Int anchor)
+        {
+            var manager = TowerPlacementManager.Instance;
+            if (manager == null)
+            {
+                Debug.LogWarning("[TowerPlacementController] No TowerPlacementManager in " +
+                                 "scene. Cannot submit placement request.");
+                return;
+            }
+
+            // Send the RPC regardless of local validity state — the server is
+            // authoritative. The local check drives the ghost color only.
+            // The server will reject and send back a reason if invalid.
+            manager.RequestPlaceTowerRpc(anchor.x, anchor.y, activeTowerTypeId);
+
+            // Exit placement mode immediately after submitting. If the server
+            // rejects, the rejection message fires via HandlePlacementRejected.
+            // If it accepts, the TowerInstance NetworkObject spawns and the
+            // placed tower appears — no ghost lingering is needed.
+            CancelPlacement();
+        }
+
+        // ----- Rejection feedback -----------------------------------------
+
+        private void HandlePlacementRejected(PlacementRejectionReason reason)
+        {
+            if (settings == null)
+            {
+                Debug.LogWarning($"[TowerPlacementController] Placement rejected: {reason} " +
+                                 $"(no TowerPlacementSettings assigned — cannot show message).");
+                return;
+            }
+
+            string message = settings.GetRejectionMessage(reason);
+
+            Debug.Log($"[TowerPlacementController] Placement rejected: {reason} → \"{message}\"");
+
+            // Fire the event so HUD components can display the message on screen.
+            // The HUD that subscribes and renders this is implemented in a later path.
+            OnRejectionMessageReady?.Invoke(message);
+        }
+
+        // ----- Player slot ------------------------------------------------
+
+        /// <summary>
+        /// Returns the local player's PlayerSlot.
+        /// STUB: Uses the same trivial client-ID → slot mapping as
+        /// <c>TowerPlacementManager.ClientIdToPlayerSlot</c>. Will be replaced
+        /// when MatchState carries the authoritative assignment.
+        /// </summary>
+        private static PlayerSlot GetLocalPlayerSlot()
+        {
+            var nm = Unity.Netcode.NetworkManager.Singleton;
+            if (nm == null || !nm.IsClient) return PlayerSlot.None;
+
+            ulong clientId = nm.LocalClientId;
+            byte slotByte = (byte)(clientId + 1);
+            if (slotByte < 1 || slotByte > 9) return PlayerSlot.None;
+            return (PlayerSlot)slotByte;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs.meta
new file mode 100644
index 0000000..2d64acb
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementController.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 124253f2cbc2d9f46befb6e1763cd6b9
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs b/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs
new file mode 100644
index 0000000..f65af84
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs
@@ -0,0 +1,547 @@
+// Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs
+using System.Collections.Generic;
+using Unity.Netcode;
+using UnityEngine;
+using TD.Core;
+using TD.Levels;
+using TD.Towers;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Server-authoritative manager for tower placement requests. Receives placement
+    /// requests from clients via RPC, validates them in order, and either spawns the
+    /// tower or rejects the request with a reason code.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Queue-based processing.</b> Incoming RPCs enqueue a
+    /// <see cref="PlacementRequest"/> rather than validating inline. Each server
+    /// Update drains up to <see cref="RequestsPerFrame"/> requests. At 60 fps this
+    /// gives ~180 validations/second, comfortably above the worst-case 90/second
+    /// (9 players × 10 placements/second). Queuing keeps the server frame budget
+    /// predictable regardless of burst traffic.</para>
+    ///
+    /// <para><b>Server-only logic.</b> All validation and mutation runs on the server.
+    /// Clients learn about accepted placements when the <see cref="TowerInstance"/>
+    /// NetworkObject spawns (NGO replicates it automatically). Clients learn about
+    /// rejections via <see cref="PlacementRejectedRpc"/>.</para>
+    ///
+    /// <para><b>Validation order:</b>
+    /// <list type="number">
+    ///   <item>Ownership — every footprint tile must be owned by the requesting player.</item>
+    ///   <item>Placement state — every footprint tile must be <c>Buildable</c> and unoccupied.</item>
+    ///   <item>Gold — the placing player must have enough gold.</item>
+    ///   <item>Path — a BFS confirms every spawner in the placing player's zone still reaches
+    ///         an exit after the footprint is stamped as non-walkable.</item>
+    /// </list></para>
+    ///
+    /// <para><b>Path-check BFS.</b> The server temporarily stamps the footprint,
+    /// runs BFS per spawner, then un-stamps if the check fails. This is O(tiles in zone)
+    /// per spawner per request — acceptable for low-frequency gameplay actions and the
+    /// queue-rate-limited processing model.</para>
+    ///
+    /// <para><b>Builder range check.</b> Deliberately omitted in Path B. The builder
+    /// system does not exist yet. When Path D is implemented, add a range check between
+    /// steps 2 and 3 above, gated on the requesting player's Builder position.</para>
+    /// </remarks>
+    public class TowerPlacementManager : NetworkBehaviour
+    {
+        // ----- Singleton --------------------------------------------------
+
+        /// <summary>
+        /// The active TowerPlacementManager. Null before the scene loads or after it unloads.
+        /// Always null-check before use. Only meaningful on the server; clients route all
+        /// placement through RPC.
+        /// </summary>
+        public static TowerPlacementManager Instance { get; private set; }
+
+        // ----- Inspector --------------------------------------------------
+
+        [Tooltip("Maximum number of placement requests processed per server Update tick. " +
+                 "At 60 fps, 3 requests/frame = 180 validations/second, well above the " +
+                 "worst-case 90/second (9 players × 10 placements/second).")]
+        [SerializeField] private int requestsPerFrame = 3;
+
+        [Tooltip("Tower definitions available in this match, indexed by TowerTypeId. " +
+                 "Populate this with every TowerDefinition asset the current race roster " +
+                 "contains. Index 0 is reserved; valid IDs start at 1. " +
+                 "(Temporary: will be driven by RaceDefinition once Path E is complete.)")]
+        [SerializeField] private TowerDefinition[] towerDefinitions = new TowerDefinition[0];
+
+        // ----- Internal request queue -------------------------------------
+
+        private struct PlacementRequest
+        {
+            public ulong SenderClientId;
+            public Vector2Int Anchor;   // SW corner of the footprint, in world-tile coords.
+            public int TowerTypeId;     // Index into towerDefinitions[].
+        }
+
+        private readonly Queue<PlacementRequest> pendingRequests = new Queue<PlacementRequest>();
+
+        // Reusable scratch collections for BFS — allocated once and cleared per
+        // check to avoid per-frame GC pressure. Only used on the server.
+        private readonly Queue<Vector2Int> bfsQueue = new Queue<Vector2Int>();
+        private readonly HashSet<Vector2Int> bfsVisited = new HashSet<Vector2Int>();
+
+        // ----- Lifecycle --------------------------------------------------
+
+        public override void OnNetworkSpawn()
+        {
+            if (IsServer)
+            {
+                if (Instance != null && Instance != this)
+                {
+                    Debug.LogError("[TowerPlacementManager] Multiple instances detected. " +
+                                   "Only one TowerPlacementManager should exist per scene.");
+                }
+                Instance = this;
+                Debug.Log("[TowerPlacementManager] Server ready.");
+            }
+        }
+
+        public override void OnNetworkDespawn()
+        {
+            if (Instance == this) Instance = null;
+        }
+
+        // ----- Server Update — queue drain --------------------------------
+
+        private void Update()
+        {
+            if (!IsServer) return;
+
+            int processed = 0;
+            while (pendingRequests.Count > 0 && processed < requestsPerFrame)
+            {
+                ProcessRequest(pendingRequests.Dequeue());
+                processed++;
+            }
+        }
+
+        // ----- RPC: client → server (placement request) -------------------
+
+        /// <summary>
+        /// Client entry point. Call this on the local client to request placing a tower.
+        /// The server will validate and either spawn the tower (visible to all clients)
+        /// or call back with <see cref="PlacementRejectedRpc"/>.
+        /// </summary>
+        /// <param name="anchorX">X component of the footprint anchor tile (world-tile coords).</param>
+        /// <param name="anchorY">Y component of the footprint anchor tile (world-tile coords).</param>
+        /// <param name="towerTypeId">Index into the server's towerDefinitions array.</param>
+        [Rpc(SendTo.Server)]
+        public void RequestPlaceTowerRpc(int anchorX, int anchorY, int towerTypeId,
+                                         RpcParams rpcParams = default)
+        {
+            pendingRequests.Enqueue(new PlacementRequest
+            {
+                SenderClientId = rpcParams.Receive.SenderClientId,
+                Anchor = new Vector2Int(anchorX, anchorY),
+                TowerTypeId = towerTypeId,
+            });
+        }
+
+        // ----- RPC: server → client (rejection notification) --------------
+
+        /// <summary>
+        /// Sent by the server to the placing client when a placement request is rejected.
+        /// The client uses the reason to display a feedback message to the player.
+        /// </summary>
+        [Rpc(SendTo.SpecifiedInParams)]
+        private void PlacementRejectedRpc(PlacementRejectionReason reason,
+                                          RpcParams rpcParams = default)
+        {
+            // This executes on the target client.
+            Debug.Log($"[TowerPlacementManager] Placement rejected: {reason}");
+
+            // TowerPlacementController listens for this via the static event below.
+            OnPlacementRejected?.Invoke(reason);
+        }
+
+        /// <summary>
+        /// Fired on the local client when the server rejects this client's placement request.
+        /// <see cref="TowerPlacementController"/> subscribes to this to display rejection
+        /// feedback messages.
+        /// </summary>
+        public static event System.Action<PlacementRejectionReason> OnPlacementRejected;
+
+        // ----- Core validation and placement logic ------------------------
+
+        private void ProcessRequest(PlacementRequest req)
+        {
+            // Resolve the TowerDefinition first — needed by every subsequent check.
+            if (!TryGetDefinition(req.TowerTypeId, out TowerDefinition def))
+            {
+                Reject(req, PlacementRejectionReason.InvalidTowerType);
+                return;
+            }
+
+            var loader = LevelLoader.Instance;
+            if (loader == null || !loader.IsLoaded)
+            {
+                Reject(req, PlacementRejectionReason.ServerError);
+                return;
+            }
+
+            // Collect the footprint tiles once; used by all subsequent checks.
+            var footprint = new List<Vector2Int>(def.FootprintSize.x * def.FootprintSize.y);
+            foreach (var tile in GridCoordinates.GetFootprintTiles(req.Anchor, def.FootprintSize))
+                footprint.Add(tile);
+
+            // ------------------------------------------------------------------
+            // Check 1: Ownership
+            // Every footprint tile must be owned by the placing player's zone.
+            // ------------------------------------------------------------------
+            PlayerSlot placingSlot = ClientIdToPlayerSlot(req.SenderClientId);
+            if (placingSlot == PlayerSlot.None)
+            {
+                Reject(req, PlacementRejectionReason.ServerError);
+                return;
+            }
+
+            foreach (var tile in footprint)
+            {
+                if (loader.GetOwner(tile) != placingSlot)
+                {
+                    Reject(req, PlacementRejectionReason.WrongOwner);
+                    return;
+                }
+            }
+
+            // ------------------------------------------------------------------
+            // Check 2: Placement state + occupancy
+            // Every footprint tile must be Buildable and not already occupied.
+            // ------------------------------------------------------------------
+            foreach (var tile in footprint)
+            {
+                if (loader.GetPlacement(tile) != PlacementState.Buildable)
+                {
+                    Reject(req, PlacementRejectionReason.TileNotBuildable);
+                    return;
+                }
+                if (loader.IsOccupied(tile))
+                {
+                    Reject(req, PlacementRejectionReason.TileOccupied);
+                    return;
+                }
+            }
+
+            // ------------------------------------------------------------------
+            // Check 3: Build range
+            // Tower must be within the placing player's builder's build range.
+            // Cheap to check; runs before gold and path so we don't burn cycles
+            // on out-of-range placements.
+            // ------------------------------------------------------------------
+            var builder = Builder.GetForClient(req.SenderClientId);
+            if (builder == null)
+            {
+                // No builder spawned for this client — server-side error, not a player-facing one.
+                Reject(req, PlacementRejectionReason.ServerError);
+                return;
+            }
+            if (!builder.IsTileWithinBuildRange(req.Anchor, def.FootprintSize))
+            {
+                Reject(req, PlacementRejectionReason.OutOfRange);
+                return;
+            }
+
+            // ------------------------------------------------------------------
+            // Check 4: Gold
+            // Validate before the path check — cheaper, and no point running BFS
+            // if the player can't afford the tower.
+            // ------------------------------------------------------------------
+            var goldManager = PlayerGoldManager.GetForClient(req.SenderClientId);
+            if (goldManager == null || goldManager.CurrentGold < def.GoldCost)
+            {
+                Reject(req, PlacementRejectionReason.InsufficientGold);
+                return;
+            }
+
+            // ------------------------------------------------------------------
+            // Check 5: Path validity
+            // Temporarily stamp the footprint, run BFS per spawner in the placing
+            // player's zone, then un-stamp if any spawner loses its exit route.
+            // ------------------------------------------------------------------
+            StampFootprint(loader, footprint, walkable: false, occupied: true);
+
+            bool pathValid = CheckPathValidity(loader, placingSlot);
+
+            if (!pathValid)
+            {
+                // Un-stamp — the placement is rejected, grid stays as it was.
+                StampFootprint(loader, footprint, walkable: true, occupied: false);
+                Reject(req, PlacementRejectionReason.BlocksPath);
+                return;
+            }
+
+            // ------------------------------------------------------------------
+            // All checks passed — commit the placement.
+            // The footprint stamp is already applied (walkable=false, occupied=true).
+            // Deduct gold and spawn the tower NetworkObject.
+            // ------------------------------------------------------------------
+            goldManager.DeductGold(def.GoldCost);
+
+            SpawnTower(def, req.Anchor, placingSlot);
+
+            Debug.Log($"[TowerPlacementManager] Placed '{def.DisplayName}' for " +
+                      $"client {req.SenderClientId} ({placingSlot}) at anchor {req.Anchor}.");
+        }
+
+        // ----- Path-validity BFS ------------------------------------------
+
+        /// <summary>
+        /// Returns true if every spawner in <paramref name="placingSlot"/>'s zone can still
+        /// reach an exit tile (any leak exit tile OR any goal tile) via walkable tiles,
+        /// given the current state of <c>LevelLoader</c>'s runtime walkability grid.
+        /// </summary>
+        /// <remarks>
+        /// Mirrors bake-time P5-4. Runs a BFS per spawner against the runtime walkability
+        /// grid. Reuses <see cref="bfsQueue"/> and <see cref="bfsVisited"/> scratch
+        /// collections (cleared between BFS runs) to avoid GC allocation per call.
+        /// </remarks>
+        private bool CheckPathValidity(LevelLoader loader, PlayerSlot slot)
+        {
+            var levelData = loader.LevelData;
+
+            // Find the PlayerZoneData for this slot.
+            PlayerZoneData zoneData = null;
+            foreach (var zone in levelData.PlayerZones)
+            {
+                if (zone.Owner == slot) { zoneData = zone; break; }
+            }
+            if (zoneData == null || zoneData.Spawners == null || zoneData.Spawners.Length == 0)
+            {
+                // No spawners means nothing to block — treat as valid.
+                return true;
+            }
+
+            // Build the exit tile set: union of all leak exit tiles and all goal tiles.
+            // This is built fresh per call because it doesn't change within a match
+            // (tiles never move), but the allocation cost is small and correctness
+            // is more important than micro-optimization here.
+            var exitTiles = BuildExitTileSet(levelData, slot);
+            if (exitTiles.Count == 0)
+            {
+                // Zone has no exits at all — this would have been caught at bake time (P5-8).
+                // Treat as valid so a bake-side error doesn't cause all placements to fail.
+                Debug.LogWarning($"[TowerPlacementManager] Zone {slot} has no exit tiles. " +
+                                 $"This should have been caught at bake time (P5-8).");
+                return true;
+            }
+
+            // BFS per spawner: each spawner's tile area is the BFS seed set.
+            foreach (var spawner in zoneData.Spawners)
+            {
+                if (!SpawnerCanReachExit(loader, spawner, exitTiles))
+                    return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Builds the set of tiles that count as "exits" for the given player zone:
+        /// all tiles of every LeakExit FROM this zone, plus all goal tiles.
+        /// </summary>
+        private HashSet<Vector2Int> BuildExitTileSet(LevelData levelData, PlayerSlot slot)
+        {
+            var exits = new HashSet<Vector2Int>();
+
+            // Leak exit tiles for this zone.
+            foreach (var zone in levelData.PlayerZones)
+            {
+                if (zone.Owner != slot) continue;
+                if (zone.LeakExits == null) continue;
+                foreach (var leak in zone.LeakExits)
+                    foreach (var tile in leak.TileArea)
+                        exits.Add(tile);
+            }
+
+            // Goal tiles (all goals count as exits for the final defender zone).
+            if (levelData.Goals != null)
+                foreach (var goal in levelData.Goals)
+                    foreach (var tile in goal.TileArea)
+                        exits.Add(tile);
+
+            return exits;
+        }
+
+        /// <summary>
+        /// BFS from <paramref name="spawner"/>'s tile area. Returns true if any exit tile
+        /// is reachable via walkable tiles. Uses the shared scratch queue and visited set.
+        /// </summary>
+        private bool SpawnerCanReachExit(LevelLoader loader, SpawnerData spawner,
+                                          HashSet<Vector2Int> exitTiles)
+        {
+            bfsQueue.Clear();
+            bfsVisited.Clear();
+
+            // Seed the BFS with the spawner's full tile area (not just its center tile),
+            // matching bake-time P5-4 exactly.
+            foreach (var tile in spawner.TileArea)
+            {
+                if (bfsVisited.Add(tile))
+                    bfsQueue.Enqueue(tile);
+            }
+
+            while (bfsQueue.Count > 0)
+            {
+                var current = bfsQueue.Dequeue();
+
+                if (exitTiles.Contains(current))
+                    return true;
+
+                foreach (var neighbor in GridCoordinates.GetNeighbors(current))
+                {
+                    if (bfsVisited.Contains(neighbor)) continue;
+                    if (!loader.IsWalkable(neighbor)) continue;
+                    bfsVisited.Add(neighbor);
+                    bfsQueue.Enqueue(neighbor);
+                }
+            }
+
+            return false;
+        }
+
+        // ----- Helpers ----------------------------------------------------
+
+        /// <summary>
+        /// Stamps or un-stamps all tiles in <paramref name="footprint"/> on both the
+        /// walkability and occupancy grids simultaneously. Always update both together.
+        /// </summary>
+        private static void StampFootprint(LevelLoader loader, List<Vector2Int> footprint,
+                                           bool walkable, bool occupied)
+        {
+            foreach (var tile in footprint)
+            {
+                loader.SetWalkable(tile, walkable);
+                loader.SetOccupied(tile, occupied);
+            }
+        }
+
+        /// <summary>
+        /// Spawns the tower NetworkObject at the footprint center and records the
+        /// placing player's slot on the <see cref="TowerInstance"/> component.
+        /// </summary>
+        private void SpawnTower(TowerDefinition def, Vector2Int anchor, PlayerSlot owner)
+        {
+            if (def.TowerPrefab == null)
+            {
+                Debug.LogError($"[TowerPlacementManager] TowerDefinition '{def.DisplayName}' " +
+                               $"has no TowerPrefab assigned. Cannot spawn.");
+                return;
+            }
+
+            Vector3 spawnPos = GridCoordinates.GetFootprintCenterWorld(anchor, def.FootprintSize);
+            // Towers sit on the buildable plane (Y=0); raise slightly so the mesh base
+            // sits flush rather than half-clipped. A cube of scale 1 needs +0.5 on Y.
+            spawnPos.y = 0.5f;
+
+            var go = Instantiate(def.TowerPrefab, spawnPos, Quaternion.identity);
+            var instance = go.GetComponent<TowerInstance>();
+            if (instance == null)
+            {
+                Debug.LogError($"[TowerPlacementManager] TowerPrefab '{def.TowerPrefab.name}' " +
+                               $"is missing a TowerInstance component.");
+                Destroy(go);
+                return;
+            }
+
+            // Set data before network spawn so TowerInstance.OnNetworkSpawn sees it.
+            instance.InitializeServer(def, anchor, owner);
+
+            var netObj = go.GetComponent<NetworkObject>();
+            if (netObj == null)
+            {
+                Debug.LogError($"[TowerPlacementManager] TowerPrefab '{def.TowerPrefab.name}' " +
+                               $"is missing a NetworkObject component.");
+                Destroy(go);
+                return;
+            }
+            netObj.Spawn(destroyWithScene: true);
+        }
+
+        // ----- Utility ----------------------------------------------------
+
+        private static bool TryGetDefinition(int typeId, out TowerDefinition def)
+        {
+            def = null;
+            // typeId 0 is reserved; valid IDs start at 1.
+            if (typeId <= 0) return false;
+            // Instance check for the static helper path — callers that have a
+            // direct reference use the instance array directly.
+            if (Instance == null) return false;
+            if (typeId >= Instance.towerDefinitions.Length) return false;
+            def = Instance.towerDefinitions[typeId];
+            return def != null;
+        }
+
+        /// <summary>
+        /// Maps a client ID to the PlayerSlot assigned to that client.
+        /// </summary>
+        /// <remarks>
+        /// STUB: Currently uses a trivial mapping where client 0 = Player1, client 1 = Player2,
+        /// etc. This will be replaced when MatchState / PlayerMatchState is implemented and
+        /// carries the authoritative client-to-slot assignment.
+        /// </remarks>
+        private static PlayerSlot ClientIdToPlayerSlot(ulong clientId)
+        {
+            // NGO client IDs start at 0 (host). PlayerSlot values start at 1.
+            // Cast is safe for up to 9 players; beyond that returns None.
+            byte slotByte = (byte)(clientId + 1);
+            if (slotByte < 1 || slotByte > 9) return PlayerSlot.None;
+            return (PlayerSlot)slotByte;
+        }
+
+        private void Reject(PlacementRequest req, PlacementRejectionReason reason)
+        {
+            Debug.Log($"[TowerPlacementManager] Rejected request from client " +
+                      $"{req.SenderClientId} at anchor {req.Anchor}: {reason}");
+
+            // Send the rejection RPC back to only the requesting client.
+            PlacementRejectedRpc(reason,
+                new RpcParams
+                {
+                    Send = new RpcSendParams
+                    {
+                        Target = RpcTarget.Single(req.SenderClientId, RpcTargetUse.Temp)
+                    }
+                });
+        }
+    }
+
+    /// <summary>
+    /// Reason codes sent to the client when the server rejects a placement request.
+    /// Used by <see cref="TowerPlacementController"/> to display the appropriate
+    /// feedback message to the player.
+    /// </summary>
+    public enum PlacementRejectionReason
+    {
+        /// <summary>One or more footprint tiles belong to a different player's zone.</summary>
+        WrongOwner,
+
+        /// <summary>One or more footprint tiles are not in a Buildable state
+        /// (they are Restricted or Outside the map).</summary>
+        TileNotBuildable,
+
+        /// <summary>One or more footprint tiles are already occupied by an existing tower.</summary>
+        TileOccupied,
+
+        /// <summary>The placing player does not have enough gold.</summary>
+        InsufficientGold,
+
+        /// <summary>The placing player's builder is too far from the requested location.</summary>
+        OutOfRange,
+
+        /// <summary>Placing this tower would block all valid paths from at least one
+        /// spawner to its exit. The maze must remain passable.</summary>
+        BlocksPath,
+
+        /// <summary>The requested tower type ID is not in the server's definition list.</summary>
+        InvalidTowerType,
+
+        /// <summary>An unexpected server-side error occurred (e.g., LevelLoader not loaded,
+        /// client not mapped to a PlayerSlot). Check server logs.</summary>
+        ServerError,
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs.meta
new file mode 100644
index 0000000..912398a
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d369496ba7887b844b1c220b524a507d
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs b/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs
new file mode 100644
index 0000000..6db99cd
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs
@@ -0,0 +1,90 @@
+// Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs
+using UnityEngine;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Project-wide settings for the tower placement system. One asset shared across all
+    /// tower types — assign it to <see cref="TowerPlacementController"/> in the scene.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Why not on TowerDefinition?</b> Ghost materials and rejection messages are
+    /// identical for every tower type. Putting them on TowerDefinition would mean 100+
+    /// assets each holding two redundant material references that must be kept in sync.
+    /// A single shared settings asset is easier to maintain and impossible to accidentally
+    /// de-sync.</para>
+    ///
+    /// <para><b>Rejection messages.</b> These are the strings shown on screen when the
+    /// server rejects a placement. Kept here so designers can tune the wording without
+    /// touching code.</para>
+    /// </remarks>
+    [CreateAssetMenu(fileName = "TowerPlacementSettings",
+                     menuName = "TD/Tower Placement Settings",
+                     order = 3)]
+    public class TowerPlacementSettings : ScriptableObject
+    {
+        // ----- Ghost visuals -----------------------------------------------
+
+        [Header("Ghost Materials")]
+        [Tooltip("Material applied to the placement ghost when placement is valid. " +
+                 "Should be a transparent/unlit white material so the tower mesh is " +
+                 "recognizable but clearly distinct from a placed tower.")]
+        public Material GhostValidMaterial;
+
+        [Tooltip("Material applied to the placement ghost when placement is invalid. " +
+                 "Should be a transparent/unlit red material.")]
+        public Material GhostInvalidMaterial;
+
+        // ----- Rejection messages ------------------------------------------
+
+        [Header("Rejection Messages")]
+        [Tooltip("Shown when the server rejects a placement because tiles belong to " +
+                 "another player's zone.")]
+        public string MessageWrongOwner = "You can only place towers in your own zone.";
+
+        [Tooltip("Shown when the server rejects because one or more tiles are " +
+                 "Restricted or Outside the map.")]
+        public string MessageTileNotBuildable = "That location is not buildable.";
+
+        [Tooltip("Shown when the server rejects because a tile is already occupied " +
+                 "by an existing tower.")]
+        public string MessageTileOccupied = "A tower already occupies that location.";
+
+        [Tooltip("Shown when the server rejects because the player cannot afford " +
+                 "the tower.")]
+        public string MessageInsufficientGold = "Not enough gold.";
+
+        [Tooltip("Shown when the server rejects because the builder is too far away " +
+                 "from the requested location.")]
+        public string MessageOutOfRange = "Your builder is too far away.";
+
+        [Tooltip("Shown when the server rejects because placing the tower would block " +
+                 "all valid paths through the player's zone.")]
+        public string MessageBlocksPath = "That placement would block the path.";
+
+        [Tooltip("Shown for unexpected server-side errors (invalid tower type, etc.). " +
+                 "Should rarely appear in normal play.")]
+        public string MessageServerError = "Placement failed. Please try again.";
+
+        // ----- Helpers -----------------------------------------------------
+
+        /// <summary>
+        /// Returns the human-readable rejection message for the given reason.
+        /// </summary>
+        public string GetRejectionMessage(PlacementRejectionReason reason)
+        {
+            switch (reason)
+            {
+                case PlacementRejectionReason.WrongOwner: return MessageWrongOwner;
+                case PlacementRejectionReason.TileNotBuildable: return MessageTileNotBuildable;
+                case PlacementRejectionReason.TileOccupied: return MessageTileOccupied;
+                case PlacementRejectionReason.InsufficientGold: return MessageInsufficientGold;
+                case PlacementRejectionReason.OutOfRange: return MessageOutOfRange;
+                case PlacementRejectionReason.BlocksPath: return MessageBlocksPath;
+                case PlacementRejectionReason.InvalidTowerType:
+                case PlacementRejectionReason.ServerError:
+                default: return MessageServerError;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs.meta
new file mode 100644
index 0000000..d3b364d
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementSettings.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 141062cbf116c924e8b63dd458262795
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs b/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs
new file mode 100644
index 0000000..92d5de7
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs
@@ -0,0 +1,37 @@
+// Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs
+using UnityEngine;
+using UnityEngine.InputSystem;
+using TD.Towers;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// TEMPORARY test helper. Press 1 to begin placing the assigned tower.
+    /// Will be replaced by HUD tower buttons in a later path. Delete this script
+    /// once the HUD is wired up.
+    /// </summary>
+    public class TowerPlacementTestTrigger : MonoBehaviour
+    {
+        [Tooltip("The TowerDefinition to place when '1' is pressed.")]
+        [SerializeField] private TowerDefinition towerToPlace;
+
+        [Tooltip("The tower type ID. Must match the index of this TowerDefinition in " +
+                 "TowerPlacementManager.towerDefinitions[]. Default 1 (slot 0 is reserved).")]
+        [SerializeField] private int towerTypeId = 1;
+
+        [Tooltip("The TowerPlacementController to drive.")]
+        [SerializeField] private TowerPlacementController controller;
+
+        private void Update()
+        {
+            var kb = Keyboard.current;
+            if (kb == null || controller == null || towerToPlace == null) return;
+
+            if (kb.digit1Key.wasPressedThisFrame)
+            {
+                controller.BeginPlacement(towerToPlace, towerTypeId);
+                Debug.Log($"[TestTrigger] BeginPlacement({towerToPlace.DisplayName}, id={towerTypeId})");
+            }
+        }
+    }
+}
diff --git a/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs.meta
new file mode 100644
index 0000000..ddbc3a4
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerPlacementTestTrigger.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ea0e3a4681be19e4e9c359c1123bf68d
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs b/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs
new file mode 100644
index 0000000..9761603
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs
@@ -0,0 +1,131 @@
+// Assets/_Project/Scripts/Gameplay/TowerRegistry.cs
+using System.Collections.Generic;
+using UnityEngine;
+using TD.Towers;
+
+namespace TD.Gameplay
+{
+    /// <summary>
+    /// Scene singleton that holds every <see cref="TowerDefinition"/> available in the
+    /// current match and lets any code look one up by asset name.
+    /// </summary>
+    /// <remarks>
+    /// <para><b>Why this exists.</b> <see cref="TowerInstance"/> replicates a tower's
+    /// definition by name (a <c>FixedString64Bytes</c> over the network), then resolves
+    /// the full ScriptableObject locally on every client. TowerRegistry is the lookup
+    /// table that makes that resolution possible without hard-coding asset paths.</para>
+    ///
+    /// <para><b>Auto-discovery.</b> On Awake, all <see cref="TowerDefinition"/> assets
+    /// under <c>Resources/TowerDefinitions/</c> are loaded automatically. No inspector
+    /// drag-and-drop required — add a new asset to that folder and it is registered at
+    /// runtime with no other changes needed. This scales cleanly to 100+ tower types.</para>
+    ///
+    /// <para><b>Path E upgrade path.</b> In Path E the registry will filter to only the
+    /// definitions belonging to the active match's <c>RaceDefinition</c> rosters. For now
+    /// all assets in the Resources folder are registered.</para>
+    ///
+    /// <para><b>Plain MonoBehaviour.</b> Not a NetworkBehaviour — the registry is
+    /// identical on every peer (same assets, same names), so there is nothing to sync.</para>
+    /// </remarks>
+    public class TowerRegistry : MonoBehaviour
+    {
+        // ----- Singleton --------------------------------------------------
+
+        /// <summary>
+        /// The active TowerRegistry. Null before Awake or after the scene unloads.
+        /// Always null-check before use.
+        /// </summary>
+        public static TowerRegistry Instance { get; private set; }
+
+        // ----- Constants --------------------------------------------------
+
+        /// <summary>
+        /// Resources-relative folder path that TowerDefinition assets must live under
+        /// to be auto-discovered. Create this folder if it doesn't exist.
+        /// Full path: Assets/Resources/TowerDefinitions/
+        /// </summary>
+        private const string ResourcesFolder = "TowerDefinitions";
+
+        // ----- Internal lookup table --------------------------------------
+
+        // Keyed by TowerDefinition.name (the asset name, not DisplayName).
+        private readonly Dictionary<string, TowerDefinition> byName
+            = new Dictionary<string, TowerDefinition>();
+
+        // ----- Lifecycle --------------------------------------------------
+
+        private void Awake()
+        {
+            if (Instance != null && Instance != this)
+            {
+                Debug.LogError("[TowerRegistry] Multiple instances detected. " +
+                               "Only one TowerRegistry should exist per scene.");
+                return;
+            }
+            Instance = this;
+
+            BuildLookupTable();
+        }
+
+        private void OnDestroy()
+        {
+            if (Instance == this) Instance = null;
+        }
+
+        // ----- Public API -------------------------------------------------
+
+        /// <summary>
+        /// Returns the <see cref="TowerDefinition"/> whose asset name equals
+        /// <paramref name="assetName"/>, or null if no match is found.
+        /// </summary>
+        public TowerDefinition Get(string assetName)
+        {
+            byName.TryGetValue(assetName, out var def);
+            return def;
+        }
+
+        /// <summary>
+        /// Returns all registered tower definitions. Enumerates the internal
+        /// dictionary values — do not modify the returned collection.
+        /// </summary>
+        public IEnumerable<TowerDefinition> All => byName.Values;
+
+        // ----- Private ----------------------------------------------------
+
+        private void BuildLookupTable()
+        {
+            byName.Clear();
+
+            // Resources.LoadAll finds every TowerDefinition asset anywhere under
+            // Assets/Resources/TowerDefinitions/ (including sub-folders).
+            // No manual registration needed — drop an asset in the folder and it
+            // is available on the next play session.
+            var loaded = Resources.LoadAll<TowerDefinition>(ResourcesFolder);
+
+            if (loaded.Length == 0)
+            {
+                Debug.LogWarning($"[TowerRegistry] No TowerDefinition assets found under " +
+                                 $"Resources/{ResourcesFolder}/. " +
+                                 $"Create the folder and add TowerDefinition assets to it.");
+                return;
+            }
+
+            foreach (var def in loaded)
+            {
+                if (def == null) continue;
+
+                if (byName.ContainsKey(def.name))
+                {
+                    Debug.LogWarning($"[TowerRegistry] Duplicate asset name '{def.name}'. " +
+                                     $"Only the first entry will be used. Rename one of the assets.");
+                    continue;
+                }
+
+                byName[def.name] = def;
+            }
+
+            Debug.Log($"[TowerRegistry] Auto-discovered and registered " +
+                      $"{byName.Count} tower definition(s) from Resources/{ResourcesFolder}/.");
+        }
+    }
+}
diff --git a/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs.meta b/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs.meta
new file mode 100644
index 0000000..6a7a87c
--- /dev/null
+++ b/Assets/_Project/Scripts/Gameplay/TowerRegistry.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a9dc0fbbe4422bc479ab8db7658c082b
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Towers.meta b/Assets/_Project/Scripts/Towers.meta
new file mode 100644
index 0000000..e3d488c
--- /dev/null
+++ b/Assets/_Project/Scripts/Towers.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 905624ec4e5c8644492123ac8abf9c13
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/_Project/Scripts/Towers/TowerDefinition.cs b/Assets/_Project/Scripts/Towers/TowerDefinition.cs
new file mode 100644
index 0000000..2634f72
--- /dev/null
+++ b/Assets/_Project/Scripts/Towers/TowerDefinition.cs
@@ -0,0 +1,96 @@
+using UnityEngine;
+
+namespace TD.Towers
+{
+    /// <summary>
+    /// Data definition for a single tower type. One asset per tower type; shared across all
+    /// instances of that tower in a match. Consumed by tower placement, construction, and
+    /// (eventually) combat systems.
+    /// </summary>
+    /// <remarks>
+    /// TowerDefinitions are authored as ScriptableObject assets and referenced by
+    /// <see cref="RaceDefinition"/> (tower roster) and <see cref="TowerInstance"/> (which
+    /// definition this placed tower corresponds to). Clients load the full asset locally
+    /// from the project's ScriptableObject pool; only the asset reference (not the full data)
+    /// is replicated over the network.
+    ///
+    /// Fields marked STUBBED are defined here to lock in the data shape but are not yet
+    /// consumed by any runtime system. They will be wired in during the sessions noted.
+    /// </remarks>
+    [CreateAssetMenu(fileName = "TowerDefinition", menuName = "TD/Tower Definition", order = 2)]
+    public class TowerDefinition : ScriptableObject
+    {
+        // -------------------------------------------------------------------
+        // Identity
+        // -------------------------------------------------------------------
+
+        [Header("Identity")]
+        [Tooltip("Human-readable name shown in the HUD tower grid and context panel.")]
+        public string DisplayName;
+
+        [Tooltip("Short description shown in the HUD context panel when this tower is selected.")]
+        [TextArea(2, 4)]
+        public string Description;
+
+        // -------------------------------------------------------------------
+        // Placement
+        // -------------------------------------------------------------------
+
+        [Header("Placement")]
+        [Tooltip("Footprint size in tiles. Default 2×2. The anchor tile is the south-west corner " +
+                 "of the footprint (minimum x, minimum y). Every tile in the footprint must be " +
+                 "Buildable and owned by the placing player for placement to succeed.")]
+        public Vector2Int FootprintSize = new Vector2Int(2, 2);
+
+        [Tooltip("Gold cost to place this tower. Deducted from the placing player's pool on " +
+                 "successful server-side placement validation.")]
+        public int GoldCost;
+
+        // -------------------------------------------------------------------
+        // Construction
+        // -------------------------------------------------------------------
+
+        [Header("Construction")]
+        [Tooltip("STUBBED — not consumed until Path D (Builder system). " +
+                 "Time in seconds from construction start to tower becoming active. " +
+                 "A Builder must be within build range for construction to proceed. " +
+                 "Set to 0 for instant construction (placeholder behaviour during Path B testing).")]
+        public float BuildTime = 0f;
+
+        // -------------------------------------------------------------------
+        // Visuals
+        // -------------------------------------------------------------------
+
+        [Header("Visuals")]
+        [Tooltip("Prefab instantiated in the world when this tower is placed. Must have a " +
+                 "TowerInstance component at its root. During Path B this is a colored cube; " +
+                 "replace with a real mesh when art is available.")]
+        public GameObject TowerPrefab;
+
+        // -------------------------------------------------------------------
+        // Combat — STUBBED
+        // -------------------------------------------------------------------
+
+        [Header("Combat (Stubbed — not consumed until combat system is implemented)")]
+        [Tooltip("STUBBED. Damage dealt per hit to a single target.")]
+        public float Damage;
+
+        [Tooltip("STUBBED. Attack range in world units. Enemies within this radius are targetable.")]
+        public float Range;
+
+        [Tooltip("STUBBED. Attacks per second.")]
+        public float FireRate;
+
+        [Tooltip("STUBBED. Radius of splash damage around the impact point. 0 = single target.")]
+        public float SplashRadius;
+
+        [Tooltip("STUBBED. Fraction by which enemy movement speed is multiplied on hit. " +
+                 "1.0 = no slow. 0.5 = 50% slow.")]
+        [Range(0f, 1f)]
+        public float SlowFactor = 1f;
+
+        [Tooltip("STUBBED. Projectile prefab fired at targets. Null = hitscan (instant hit, no " +
+                 "projectile travel).")]
+        public GameObject ProjectilePrefab;
+    }
+}
\ No newline at end of file
diff --git a/Assets/_Project/Scripts/Towers/TowerDefinition.cs.meta b/Assets/_Project/Scripts/Towers/TowerDefinition.cs.meta
new file mode 100644
index 0000000..b767f9b
--- /dev/null
+++ b/Assets/_Project/Scripts/Towers/TowerDefinition.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7b353a757b6e6774d97e6fb8ba138fcc
\ No newline at end of file
diff --git a/Assets/_Project/Settings/PC_Renderer.asset b/Assets/_Project/Settings/PC_Renderer.asset
index 475b02e..c042b56 100644
--- a/Assets/_Project/Settings/PC_Renderer.asset
+++ b/Assets/_Project/Settings/PC_Renderer.asset
@@ -13,32 +13,28 @@ MonoBehaviour:
   m_Name: PC_Renderer
   m_EditorClassIdentifier: 
   debugShaders:
-    debugReplacementPS: {fileID: 4800000, guid: cf852408f2e174538bcd9b7fda1c5ae7,
-      type: 3}
+    debugReplacementPS: {fileID: 4800000, guid: cf852408f2e174538bcd9b7fda1c5ae7, type: 3}
     hdrDebugViewPS: {fileID: 4800000, guid: 573620ae32aec764abd4d728906d2587, type: 3}
-    probeVolumeSamplingDebugComputeShader: {fileID: 7200000, guid: 53626a513ea68ce47b59dc1299fe3959,
-      type: 3}
+    probeVolumeSamplingDebugComputeShader: {fileID: 7200000, guid: 53626a513ea68ce47b59dc1299fe3959, type: 3}
   probeVolumeResources:
-    probeVolumeDebugShader: {fileID: 4800000, guid: e5c6678ed2aaa91408dd3df699057aae,
-      type: 3}
-    probeVolumeFragmentationDebugShader: {fileID: 4800000, guid: 03cfc4915c15d504a9ed85ecc404e607,
-      type: 3}
-    probeVolumeOffsetDebugShader: {fileID: 4800000, guid: 53a11f4ebaebf4049b3638ef78dc9664,
-      type: 3}
-    probeVolumeSamplingDebugShader: {fileID: 4800000, guid: 8f96cd657dc40064aa21efcc7e50a2e7,
-      type: 3}
-    probeSamplingDebugMesh: {fileID: -3555484719484374845, guid: 57d7c4c16e2765b47a4d2069b311bffe,
-      type: 3}
-    probeSamplingDebugTexture: {fileID: 2800000, guid: 24ec0e140fb444a44ab96ee80844e18e,
-      type: 3}
-    probeVolumeBlendStatesCS: {fileID: 7200000, guid: b9a23f869c4fd45f19c5ada54dd82176,
-      type: 3}
+    probeVolumeDebugShader: {fileID: 4800000, guid: e5c6678ed2aaa91408dd3df699057aae, type: 3}
+    probeVolumeFragmentationDebugShader: {fileID: 4800000, guid: 03cfc4915c15d504a9ed85ecc404e607, type: 3}
+    probeVolumeOffsetDebugShader: {fileID: 4800000, guid: 53a11f4ebaebf4049b3638ef78dc9664, type: 3}
+    probeVolumeSamplingDebugShader: {fileID: 4800000, guid: 8f96cd657dc40064aa21efcc7e50a2e7, type: 3}
+    probeSamplingDebugMesh: {fileID: -3555484719484374845, guid: 57d7c4c16e2765b47a4d2069b311bffe, type: 3}
+    probeSamplingDebugTexture: {fileID: 2800000, guid: 24ec0e140fb444a44ab96ee80844e18e, type: 3}
+    probeVolumeBlendStatesCS: {fileID: 7200000, guid: b9a23f869c4fd45f19c5ada54dd82176, type: 3}
   m_RendererFeatures:
   - {fileID: 7833122117494664109}
-  m_RendererFeatureMap: ad6b866f10d7b46c
+  - {fileID: 1099573597859666308}
+  m_RendererFeatureMap: ad6b866f10d7b46c84d9d2885c78420f
   m_UseNativeRenderPass: 1
+  xrSystemData: {fileID: 0}
   postProcessData: {fileID: 11400000, guid: 41439944d30ece34e96484bdb6645b55, type: 2}
-  m_AssetVersion: 2
+  m_AssetVersion: 3
+  m_PrepassLayerMask:
+    serializedVersion: 2
+    m_Bits: 4294967295
   m_OpaqueLayerMask:
     serializedVersion: 2
     m_Bits: 4294967295
@@ -56,8 +52,31 @@ MonoBehaviour:
   m_RenderingMode: 2
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diff --git a/Assets/_Project/Settings/TowerPlacementSettings.asset b/Assets/_Project/Settings/TowerPlacementSettings.asset
new file mode 100644
index 0000000..1138248
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@@ -0,0 +1,22 @@
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+  MessageWrongOwner: You can only place towers in your own zone.
+  MessageTileNotBuildable: That location is not buildable.
+  MessageTileOccupied: A tower already occupies that location.
+  MessageInsufficientGold: Not enough gold.
+  MessageBlocksPath: That placement would block the path.
+  MessageServerError: Placement failed. Please try again.
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diff --git a/ProjectSettings/TagManager.asset b/ProjectSettings/TagManager.asset
index 1d9a303..cec8516 100644
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@@ -12,7 +12,7 @@ TagManager:
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+  - TerrainGeometry
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diff --git a/ProjectSettings/URPProjectSettings.asset b/ProjectSettings/URPProjectSettings.asset
index 64a8674..6ad5631 100644
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