var Bowl = Container.expand(function () {
	var self = Container.call(this);
	var bowlGraphics = self.createAsset('bowl', 'Bowl Graphics', 0, 1);
	self.x = 0;
	self.y = 2732 - bowlGraphics.height;
	self.height = bowlGraphics.height;
	self.containsPoint = function (point) {
		return point.x >= this.x && point.x <= this.x + this.width && point.y >= this.y - 300 && point.y <= this.y + this.height;
	};
	self.hasEgg = false;
	self.hasSugar = false;
	self.hasButter = false;
});
var Egg = Container.expand(function () {
	var self = Container.call(this);
	var eggGraphics = self.createAsset('egg', 'Egg Graphics', .5, .5);
	self.containsPoint = function (point) {
		return point.x >= this.x - this.width / 2 && point.x <= this.x + this.width / 2 && point.y >= this.y - this.height / 2 && point.y <= this.y + this.height / 2;
	};
	self.crack = function () {
		var crackedEggGraphics = self.createAsset('cracked_egg', 'Cracked Egg Graphics', .5, .5);
		self.removeChild(eggGraphics);
		self.addChild(crackedEggGraphics);
	};
});
var Sugar = Container.expand(function () {
	var self = Container.call(this);
	var sugarGraphics = self.createAsset('sugar', 'Sugar Graphics', .5, .5);
	self.containsPoint = function (point) {
		return point.x >= this.x - this.width / 2 && point.x <= this.x + this.width / 2 && point.y >= this.y - this.height / 2 && point.y <= this.y + this.height / 2;
	};
	self.pour = function (bowl) {
		var pouredSugarGraphics = self.createAsset('poured_sugar', 'Poured Sugar Graphics', .5, .5);
		self.removeChild(sugarGraphics);
		self.addChild(pouredSugarGraphics);
	};
});
var Butter = Container.expand(function () {
	var self = Container.call(this);
	var butterGraphics = self.createAsset('butter', 'Butter Graphics', .5, .5);
	self.containsPoint = function (point) {
		return point.x >= this.x - this.width / 2 && point.x <= this.x + this.width / 2 && point.y >= this.y - this.height / 2 && point.y <= this.y + this.height / 2;
	};
	self.unpack = function (bowl) {
		var unpackedButterGraphics = self.createAsset('unpacked_butter', 'Unpacked Butter Graphics', .5, .5);
		self.removeChild(butterGraphics);
		self.addChild(unpackedButterGraphics);
	};
});
var Cookie = Container.expand(function () {
	var self = Container.call(this);
	var cookieGraphics = self.createAsset('cookie', 'Cookie Graphics', .5, .5);
	self.bake = function () {};
	self.addBiteMark = function () {
		var biteMarkGraphics = self.createAsset('bitemark', 'Bite Mark Graphics', .5, .5);
		biteMarkGraphics.x = cookieGraphics.x;
		biteMarkGraphics.y = cookieGraphics.y;
		biteMarkGraphics.blendMode = "erase";
		self.addChild(biteMarkGraphics);
	};
	self.flyToRandomPosition = function () {
		var randomX = Math.random() * 2048;
		var randomY = Math.random() * (2732 / 2);
		self.elasticTween = function (start, end, duration, callback) {
			var delta = end - start;
			var startTime = LK.ticks;
			function easeInOutElastic(t, b, c, d) {
				t /= d / 2;
				if (t < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
				t--;
				return c / 2 * (-Math.pow(2, -10 * t) + 2) + b;
			}
			var tickHandler = function () {
				var currentTime = LK.ticks - startTime;
				if (currentTime < duration) {
					var newPos = easeInOutElastic(currentTime, start, delta, duration);
					callback(newPos);
				} else {
					callback(end);
					LK.off('tick', tickHandler);
				}
			};
			LK.on('tick', tickHandler);
		};
		self.elasticTween(self.y, randomY, 120, (function (newY) {
			self.y = newY;
		}).bind(self));
		self.elasticTween(self.x, randomX, 120, (function (newX) {
			self.x = newX;
		}).bind(self));
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		bowls.forEach(function (bowl, index) {
			if (bowl.containsPoint(pos) && bowl.hasEgg && bowl.hasSugar && bowl.hasButter) {
				for (var j = 0; j < 10; j++) {
					var cookie = new Cookie();
					cookie.bake();
					cookie.x = bowl.x + bowl.width / 2;
					cookie.y = bowl.y - cookie.height / 2;
					cookie.roation = Math.random() * (Math.PI * 2);
					self.addChild(cookie);
					cookies.push(cookie);
					cookie.flyToRandomPosition();
					cookie.on('down', function () {
						this.addBiteMark();
					});
				}
				bowls[index].destroy();
				bowls.splice(index, 1);
				sugars[index].destroy();
				sugars.splice(index, 1);
				butters[index].destroy();
				butters.splice(index, 1);
				eggs[index].destroy();
				eggs.splice(index, 1);
			}
		});
		eggs.forEach(function (egg, index) {
			if (egg.containsPoint(pos)) {
				egg.crack();
				var targetBowl = bowls[index % bowls.length];
				egg.x = targetBowl.x + targetBowl.width / 2 + 60;
				egg.y = targetBowl.y - egg.height - 50;
				targetBowl.hasEgg = true;
			}
		});
		butters.forEach(function (butter, index) {
			if (butter.containsPoint(pos)) {
				var targetBowl = bowls[index % bowls.length];
				butter.unpack(targetBowl);
				butter.x = targetBowl.x + targetBowl.width / 2 - 60;
				butter.y = targetBowl.y - butter.height - 50;
				targetBowl.hasButter = true;
			}
		});
		sugars.forEach(function (sugar, index) {
			if (sugar.containsPoint(pos)) {
				var targetBowl = bowls[index % bowls.length];
				sugar.pour();
				sugar.x = targetBowl.x + targetBowl.width / 2;
				sugar.y = targetBowl.y - sugar.height;
				targetBowl.hasSugar = true;
			}
		});
	});
	var bowls = [];
	var sugars = [];
	var eggs = [];
	var butters = [];
	var cookies = [];
	for (var i = 0; i < 8; i++) {
		var bowl = new Bowl();
		bowl.x = i * (bowl.width + 10);
		bowls.push(bowl);
		self.addChild(bowl);
		var sugar = new Sugar();
		sugar.x = 200 + Math.random() * 1600;
		sugar.y = 200 + Math.random() * 2032;
		sugars.push(sugar);
		self.addChild(sugar);
		var butter = new Butter();
		butter.x = 200 + Math.random() * 1600;
		butter.y = 200 + Math.random() * 2032;
		butters.push(butter);
		self.addChild(butter);
		var egg = new Egg();
		egg.x = 200 + Math.random() * 1600;
		egg.y = 200 + Math.random() * 2032;
		self.addChild(egg);
		eggs.push(egg);
	}
});

===================================================================
--- original.js
+++ change.js
@@ -81,14 +81,14 @@
 				}
 			};
 			LK.on('tick', tickHandler);
 		};
-		self.elasticTween(self.y, randomY, 120, function (newY) {
+		self.elasticTween(self.y, randomY, 120, (function (newY) {
 			self.y = newY;
-		});
-		self.elasticTween(self.x, randomX, 120, function (newX) {
+		}).bind(self));
+		self.elasticTween(self.x, randomX, 120, (function (newX) {
 			self.x = newX;
-		});
+		}).bind(self));
 	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);