===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,161 @@
-/****
+/**** 
+* Classes
+****/ 
+var Block = Container.expand(function (blockType) {
+	var self = Container.call(this);
+	self.blockType = blockType || 'stone';
+	var assetName = self.blockType + 'Block';
+	var blockGraphics = self.attachAsset(assetName, {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	return self;
+});
+var BlockButton = Container.expand(function (blockType) {
+	var self = Container.call(this);
+	self.blockType = blockType;
+	self.isSelected = false;
+	self.buttonBg = self.attachAsset('buttonBg', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.selectedBg = self.attachAsset('selectedButtonBg', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.selectedBg.visible = false;
+	var blockPreview = new Block(blockType);
+	blockPreview.scale.set(0.6);
+	self.addChild(blockPreview);
+	self.setSelected = function (selected) {
+		self.isSelected = selected;
+		self.buttonBg.visible = !selected;
+		self.selectedBg.visible = selected;
+	};
+	self.down = function (x, y, obj) {
+		selectBlockType(self.blockType);
+	};
+	return self;
+});
+var GridCell = Container.expand(function (gridX, gridY) {
+	var self = Container.call(this);
+	self.gridX = gridX;
+	self.gridY = gridY;
+	self.hasBlock = false;
+	self.block = null;
+	var cellBorder = self.attachAsset('gridCell', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	cellBorder.alpha = 0.1;
+	self.placeBlock = function (blockType) {
+		if (!self.hasBlock) {
+			self.block = new Block(blockType);
+			self.addChild(self.block);
+			self.hasBlock = true;
+			LK.getSound('placeBlock').play();
+		}
+	};
+	self.removeBlock = function () {
+		if (self.hasBlock && self.block) {
+			self.removeChild(self.block);
+			self.block = null;
+			self.hasBlock = false;
+			LK.getSound('removeBlock').play();
+		}
+	};
+	self.down = function (x, y, obj) {
+		if (self.hasBlock) {
+			self.removeBlock();
+		} else {
+			self.placeBlock(selectedBlockType);
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87CEEB
+});
+
+/**** 
+* Game Code
+****/ 
+var GRID_SIZE = 120;
+var GRID_COLS = 16;
+var GRID_ROWS = 18;
+var GRID_START_X = (2048 - GRID_COLS * GRID_SIZE) / 2;
+var GRID_START_Y = 100;
+var selectedBlockType = 'stone';
+var grid = [];
+var blockButtons = {};
+// Create grid
+for (var row = 0; row < GRID_ROWS; row++) {
+	grid[row] = [];
+	for (var col = 0; col < GRID_COLS; col++) {
+		var cell = new GridCell(col, row);
+		cell.x = GRID_START_X + col * GRID_SIZE + GRID_SIZE / 2;
+		cell.y = GRID_START_Y + row * GRID_SIZE + GRID_SIZE / 2;
+		grid[row][col] = cell;
+		game.addChild(cell);
+	}
+}
+// Create block selection buttons
+var buttonContainer = new Container();
+buttonContainer.x = 2048 / 2;
+buttonContainer.y = 2732 - 100;
+game.addChild(buttonContainer);
+var blockTypes = ['stone', 'dirt', 'grass'];
+var buttonSpacing = 200;
+var totalWidth = (blockTypes.length - 1) * buttonSpacing;
+var startX = -totalWidth / 2;
+for (var i = 0; i < blockTypes.length; i++) {
+	var blockType = blockTypes[i];
+	var button = new BlockButton(blockType);
+	button.x = startX + i * buttonSpacing;
+	blockButtons[blockType] = button;
+	buttonContainer.addChild(button);
+}
+// Create clear button
+var clearButton = new Container();
+var clearBg = clearButton.attachAsset('buttonBg', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	scaleX: 1.2
+});
+var clearText = new Text2('CLEAR', {
+	size: 40,
+	fill: 0xFFFFFF
+});
+clearText.anchor.set(0.5, 0.5);
+clearButton.addChild(clearText);
+clearButton.x = 2048 / 2;
+clearButton.y = 2732 - 250;
+game.addChild(clearButton);
+clearButton.down = function (x, y, obj) {
+	clearGrid();
+};
+function selectBlockType(blockType) {
+	selectedBlockType = blockType;
+	for (var type in blockButtons) {
+		blockButtons[type].setSelected(type === blockType);
+	}
+}
+function clearGrid() {
+	for (var row = 0; row < GRID_ROWS; row++) {
+		for (var col = 0; col < GRID_COLS; col++) {
+			if (grid[row][col].hasBlock) {
+				grid[row][col].removeBlock();
+			}
+		}
+	}
+}
+;
+// Initialize with stone selected
+selectBlockType('stone');
+game.update = function () {
+	// Game runs continuously for creative building
+};
\ No newline at end of file