===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,156 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var GridCell = Container.expand(function () {
+	var self = Container.call(this);
+	var border = self.attachAsset('grid_border', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var background = self.attachAsset('grid_cell', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.blockType = null;
+	self.blockGraphics = null;
+	self.placeBlock = function (blockType) {
+		if (self.blockGraphics) {
+			self.removeChild(self.blockGraphics);
+		}
+		if (blockType && blockType !== 'empty') {
+			self.blockGraphics = self.attachAsset(blockType + '_block', {
+				anchorX: 0.5,
+				anchorY: 0.5
+			});
+			self.blockType = blockType;
+			LK.setScore(LK.getScore() + 1);
+			scoreTxt.setText(LK.getScore());
+		} else {
+			self.blockGraphics = null;
+			self.blockType = null;
+		}
+	};
+	self.removeBlock = function () {
+		if (self.blockGraphics) {
+			self.removeChild(self.blockGraphics);
+			self.blockGraphics = null;
+			self.blockType = null;
+		}
+	};
+	self.down = function (x, y, obj) {
+		if (selectedBlockType === 'empty') {
+			self.removeBlock();
+		} else if (self.blockType === null) {
+			self.placeBlock(selectedBlockType);
+		} else {
+			self.removeBlock();
+		}
+	};
+	return self;
+});
+var ToolbarButton = Container.expand(function (blockType) {
+	var self = Container.call(this);
+	self.blockType = blockType;
+	var background = self.attachAsset('toolbar_button', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.selectedBorder = self.attachAsset('toolbar_selected', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.selectedBorder.visible = false;
+	if (blockType !== 'empty') {
+		var blockPreview = self.attachAsset(blockType + '_block', {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			scaleX: 0.8,
+			scaleY: 0.8
+		});
+	}
+	self.setSelected = function (selected) {
+		self.selectedBorder.visible = selected;
+	};
+	self.down = function (x, y, obj) {
+		selectedBlockType = self.blockType;
+		updateToolbarSelection();
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x34495e
+});
+
+/**** 
+* Game Code
+****/ 
+// Game constants
+var GRID_SIZE = 20;
+var CELL_SIZE = 80;
+var GRID_START_X = 200;
+var GRID_START_Y = 200;
+// Game variables
+var selectedBlockType = 'stone';
+var gridCells = [];
+var toolbarButtons = [];
+var blockTypes = ['stone', 'wood', 'metal', 'glass', 'grass', 'water', 'empty'];
+// Create score display
+var scoreTxt = new Text2('0', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+scoreTxt.setText(LK.getScore());
+// Create toolbar background
+var toolbarBg = game.addChild(LK.getAsset('toolbar_bg', {
+	x: 50,
+	y: 366,
+	anchorX: 0.5,
+	anchorY: 0.5
+}));
+// Create toolbar buttons
+function createToolbar() {
+	for (var i = 0; i < blockTypes.length; i++) {
+		var button = new ToolbarButton(blockTypes[i]);
+		button.x = 50;
+		button.y = 150 + i * 90;
+		toolbarButtons.push(button);
+		game.addChild(button);
+	}
+	updateToolbarSelection();
+}
+function updateToolbarSelection() {
+	for (var i = 0; i < toolbarButtons.length; i++) {
+		toolbarButtons[i].setSelected(toolbarButtons[i].blockType === selectedBlockType);
+	}
+}
+// Create grid
+function createGrid() {
+	for (var row = 0; row < GRID_SIZE; row++) {
+		gridCells[row] = [];
+		for (var col = 0; col < GRID_SIZE; col++) {
+			var cell = new GridCell();
+			cell.x = GRID_START_X + col * CELL_SIZE;
+			cell.y = GRID_START_Y + row * CELL_SIZE;
+			gridCells[row][col] = cell;
+			game.addChild(cell);
+		}
+	}
+}
+// Initialize game elements
+createToolbar();
+createGrid();
+// Game update loop
+game.update = function () {
+	// No continuous updates needed for this game
+};
\ No newline at end of file