Scripts/UI/Common/UIHandler.cs

@@ -169,19 +169,23 @@ public partial class UIHandler : Control
 	{
 		currentLayer.Text = $"Current layer: {GameData.currentLayer}/{GameData.ruinSize}";
 		deepestLayer.Text = $"Deepest layer: {GameData.lowestLayer}";
+		unlockLayer.TooltipText = "Needed items: \r" + GameData.map[GameData.lowestLayer].DisplayGateIngredients();
+		unlockLayer.Disabled = !GameData.inventory.CanCraft(GameData.map[GameData.lowestLayer].gateIngredients, 1);
 	}
 
 	public void UnlockLayer()
+	{
+		if (GameData.inventory.CanCraft(GameData.map[GameData.lowestLayer].gateIngredients, 1))
 		{
 			foreach (Ingredient ingredient in GameData.map[GameData.lowestLayer].gateIngredients)
 			{
-			GD.Print($"{ingredient.Item} ({ingredient.Amount})");
+				GameData.inventory.RemoveItem(ingredient.Item, ingredient.Amount);
 			}
-		GD.Print("------------------------");
 			GameData.lowestLayer++;
 			if (GameData.lowestLayer == GameData.ruinSize)
 			{
 				GD.Print("GAME WON!");
 			}
 		}
+	}
 }

Scripts/World/Layer.cs

@@ -264,4 +264,14 @@ public partial class Layer : Node3D
 		}
 		return result;
 	}
+
+	public string DisplayGateIngredients()
+	{
+		string result = "";
+		foreach (Ingredient ingredient in gateIngredients)
+		{
+			result += $"{ItemData.GetReadableName(ingredient.Item)} ({ingredient.Amount})\r";
+		}
+		return result;
+	}
 }