diff --git a/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs b/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs
index 90378c5..bb24fe4 100644
--- a/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs
+++ b/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs
@@ -23,6 +23,7 @@ public class CameraSlotClickDetect : MonoBehaviour
         if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerMask))
         {
             var slotInfo = hit.collider.gameObject.GetComponentInParent<SlotManager>();
+            slotInfo.OnClick();
 
             Debug.Log($"Hit PlacementSlot! At ({slotInfo.x}, {slotInfo.y})");
         }
diff --git a/Assets/Scripts/PlacementSystem/GridManager.cs b/Assets/Scripts/PlacementSystem/GridManager.cs
index f902747..73609a3 100644
--- a/Assets/Scripts/PlacementSystem/GridManager.cs
+++ b/Assets/Scripts/PlacementSystem/GridManager.cs
@@ -7,14 +7,19 @@ public class GridManager : MonoBehaviour
 {
     [SerializeField] private Vector2Int GridSize;
     [SerializeField] private float Gap = 0.1f;
+    [SerializeField] private GridType gridType = GridType.Primary;
     [Space(10)]
     [SerializeField] private GameObject TowerSlotPrefab;
 
     [DoNotSerialize] public List<GameObject> SpawnedSlots = new();
 
+    [DoNotSerialize] public string[,] GridStates;
+
     private void OnEnable()
     {
         TowerPlacementManager.OnSpawnGridRequested += SpawnSlots;
+
+        GridStates = new string[GridSize.x, GridSize.y];
     }
 
     private void OnDisable()
@@ -39,8 +44,17 @@ public class GridManager : MonoBehaviour
                 infoHolder.x = x;
                 infoHolder.y = y;
 
+                infoHolder.OnSlotClicked += sender.OnSlotClicked;
+
                 SpawnedSlots.Add(spawned);
             }
         }
     }
+}
+
+public enum GridType
+{
+    Primary,
+    Wall,
+    Celling
 }
\ No newline at end of file
diff --git a/Assets/Scripts/PlacementSystem/PlacementManager.cs b/Assets/Scripts/PlacementSystem/PlacementManager.cs
index bdc46cd..9095ef8 100644
--- a/Assets/Scripts/PlacementSystem/PlacementManager.cs
+++ b/Assets/Scripts/PlacementSystem/PlacementManager.cs
@@ -10,9 +10,11 @@ public class TowerPlacementManager : MonoBehaviour
     /// Sender
     /// </summary>
     public static event Action<TowerPlacementManager> OnSpawnGridRequested;
-
     public static TowerPlacementManager Singleton;
 
+    // Section: Selection
+    private SlotManager CurrentSelected;
+
     private void Start()
     {
         if (Singleton != this)
@@ -24,6 +26,24 @@ public class TowerPlacementManager : MonoBehaviour
 
     public void OnSlotClicked(SlotManager slot, GridManager grid, int x, int y)
     {
+        slot.gameObject.GetComponentInChildren<Renderer>().material.color = Color.blue;
+        OnSelectSlot(slot);
+    }
 
+    // Called when a slot is selected
+    public void OnSelectSlot(SlotManager slot)
+    {
+        // Detects if the selected slot is new
+        if (CurrentSelected != null && CurrentSelected != slot)
+            OnDeselectSlot(CurrentSelected, slot);
+        CurrentSelected = slot;
+
+        slot.gameObject.GetComponentInChildren<Renderer>().material.color = Color.blue;
+    }
+
+    // Called when another slot is getting selected
+    public void OnDeselectSlot(SlotManager prevSlot, SlotManager newSlot)
+    {
+        prevSlot.gameObject.GetComponentInChildren<Renderer>().material.color = Color.white;
     }
 }
diff --git a/Assets/Scripts/PlacementSystem/SlotManager.cs b/Assets/Scripts/PlacementSystem/SlotManager.cs
index 1cf3f1a..9cb1121 100644
--- a/Assets/Scripts/PlacementSystem/SlotManager.cs
+++ b/Assets/Scripts/PlacementSystem/SlotManager.cs
@@ -12,5 +12,10 @@ public class SlotManager : MonoBehaviour
     /// <summary>
     /// (Sender, spawnerRef, X, Y)
     /// </summary>
-    public static event Action<SlotManager, GridManager, int, int> OnSlotClicked;
+    public event Action<SlotManager, GridManager, int, int> OnSlotClicked;
+
+    public void OnClick()
+    {
+        OnSlotClicked?.Invoke(this, spawnerRef, x, y);
+    }
 }