var ColorButton = Container.expand(function (color) {
	var self = Container.call(this);
	var buttonGraphics = self.createAsset('colorButton' + color, 'Color Button ' + color, .5, .5);
	if (color === 'blu') buttonGraphics.destroy();
	if (color === 'red') buttonGraphics.destroy();
	if (color === 'yellow') buttonGraphics.destroy();
	if (color === 'green') buttonGraphics.destroy();
	self.color = color;
});
var Pencil = Container.expand(function () {
	var self = Container.call(this);
	var pencilGraphics = self.createAsset('pencil', 'Pencil for drawing', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.x += self.speed;
	};
});
var Drawing = Container.expand(function (color) {
	var self = Container.call(this);
	var drawingGraphics = self.createAsset('drawing', 'Drawing by pencil', .5, .5);
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var pencil = self.addChild(new Pencil());
	pencil.x = 1024;
	pencil.y = 1366;
	var drawings = [];
	var isDrawing = false;
	var resetButton = self.createAsset('resetButton', 'Reset Button', 0, 0);
	resetButton.x = 0;
	resetButton.y = 0;
	LK.gui.topLeft.addChild(resetButton);
	resetButton.on('down', function () {
		LK.showGameOver();
	});
	var timer = LK.setInterval(function () {
		if (isDrawing) {
			var newDrawing = new Drawing();
			newDrawing.x = pencil.x;
			newDrawing.y = pencil.y;
			drawings.push(newDrawing);
			self.addChild(newDrawing);
		}
	}, 1000 / 60);
	pencil.on('down', function (obj) {
		isDrawing = true;
	});
	stage.on('up', function (obj) {
		isDrawing = false;
	});
	stage.on('move', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		pencil.x = pos.x;
		pencil.y = pos.y;
	});
	LK.on('tick', function () {
		pencil.move();
		if (pencil.x < 0 || pencil.x > 2048 || pencil.y < 0 || pencil.y > 2732) {
			LK.clearInterval(timer);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,11 @@
 var ColorButton = Container.expand(function (color) {
 	var self = Container.call(this);
 	var buttonGraphics = self.createAsset('colorButton' + color, 'Color Button ' + color, .5, .5);
+	if (color === 'blu') buttonGraphics.destroy();
+	if (color === 'red') buttonGraphics.destroy();
+	if (color === 'yellow') buttonGraphics.destroy();
+	if (color === 'green') buttonGraphics.destroy();
 	self.color = color;
 });
 var Pencil = Container.expand(function () {
 	var self = Container.call(this);