===================================================================
--- original.js
+++ change.js
@@ -1,58 +1,90 @@
-/****
+/**** 
 * Classes
-****/
+****/ 
 // Defense class
 var Defense = Container.expand(function () {
-  var self = Container.call(this);
-  var defenseGraphics = self.attachAsset('defense', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.update = function () {
-    // Defense logic goes here
-  };
+	var self = Container.call(this);
+	var defenseGraphics = self.attachAsset('defense', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.update = function () {
+		// Defense logic goes here
+	};
 });
 // Enemy class
 var Enemy = Container.expand(function () {
-  var self = Container.call(this);
-  var enemyGraphics = self.attachAsset('enemy', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.update = function () {
-    // Enemy logic goes here
-  };
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.update = function () {
+		// Enemy logic goes here
+	};
 });
 // Assets will be automatically created and loaded by the LK engine
 // Tower class
 var Tower = Container.expand(function () {
-  var self = Container.call(this);
-  var towerGraphics = self.attachAsset('tower', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.update = function () {
-    // Tower logic goes here
-  };
+	var self = Container.call(this);
+	var towerGraphics = self.attachAsset('tower', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.update = function () {
+		// Tower logic goes here
+	};
 });
 
-/****
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-  backgroundColor: 0x000000 //Init game with black background 
+	backgroundColor: 0x000000 //Init game with black background 
 });
 
-/****
+/**** 
 * Game Code
-****/
+****/ 
+// Grid class
 // Initialize game variables
+var Grid = function Grid(rows, cols, cellSize) {
+	this.rows = rows;
+	this.cols = cols;
+	this.cellSize = cellSize;
+	this.grid = [];
+	// Initialize the grid with empty cells
+	for (var i = 0; i < rows; i++) {
+		this.grid[i] = [];
+		for (var j = 0; j < cols; j++) {
+			this.grid[i][j] = null;
+		}
+	}
+	// Method to add an object to the grid
+	this.addObject = function (obj, row, col) {
+		if (this.isValidCell(row, col)) {
+			this.grid[row][col] = obj;
+			obj.x = col * this.cellSize + this.cellSize / 2;
+			obj.y = row * this.cellSize + this.cellSize / 2;
+		}
+	};
+	// Method to remove an object from the grid
+	this.removeObject = function (row, col) {
+		if (this.isValidCell(row, col)) {
+			this.grid[row][col] = null;
+		}
+	};
+	// Check if a cell is within the grid bounds
+	this.isValidCell = function (row, col) {
+		return row >= 0 && row < this.rows && col >= 0 && col < this.cols;
+	};
+};
 var tower = game.addChild(new Tower());
 tower.x = 2048 / 2;
 tower.y = 2732 / 2;
 var enemies = [];
 var defenses = [];
 game.update = function () {
-  // Game logic goes here
-  // Spawn enemies, update defenses, check for collisions, etc.
+	// Game logic goes here
+	// Spawn enemies, update defenses, check for collisions, etc.
 };
\ No newline at end of file