var Player = (function () {
	var instance;
	function createInstance() {}
	return {
		getInstance: function () {
			if (!instance) {
				instance = createInstance();
			}
			return instance;
		}
	};
})();
var IceBlock = Container.expand(function () {
	var self = Container.call(this);
	var iceBlockGraphics = self.createAsset('iceBlock', 'Ice Block', .5, .5);
	self.destroyBlock = function () {
		self.destroy();
	};
});
var self = Container.expand(function () {
	self = Container.call(this);
	var playerGraphics = self.createAsset('player', 'Player character', .5, .5);
	self.move = function (direction) {
		switch (direction) {
			case 'up':
				self.y -= 10;
				break;
			case 'down':
				self.y += 10;
				break;
			case 'left':
				self.x -= 10;
				break;
			case 'right':
				self.x += 10;
				break;
		}
	};
	self.shoot = function () {};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('bullet', 'Bullet', .5, .5);
	self.move = function () {};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy character', .5, .5);
	self.move = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var player = self.addChild(Player.getInstance());
	LK.on('keydown', function (event) {
		switch (event.key) {
			case 'ArrowUp':
			case 'w':
				player.move('up');
				break;
			case 'ArrowDown':
			case 's':
				player.move('down');
				break;
			case 'ArrowLeft':
			case 'a':
				player.move('left');
				break;
			case 'ArrowRight':
			case 'd':
				player.move('right');
				break;
		}
	});
	var bullets = [];
	var enemies = [];
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	var iceBlocks = [];
	for (var i = 0; i < 20; i++) {
		var topIceBlock = new IceBlock();
		topIceBlock.x = i * 200;
		topIceBlock.y = 0;
		iceBlocks.push(topIceBlock);
		self.addChild(topIceBlock);
		var bottomIceBlock = new IceBlock();
		bottomIceBlock.x = i * 200;
		bottomIceBlock.y = 2732 - bottomIceBlock.height;
		iceBlocks.push(bottomIceBlock);
		self.addChild(bottomIceBlock);
	}
	for (var j = 1; j < 13; j++) {
		var leftIceBlock = new IceBlock();
		leftIceBlock.x = 0;
		leftIceBlock.y = j * 200;
		iceBlocks.push(leftIceBlock);
		self.addChild(leftIceBlock);
		var rightIceBlock = new IceBlock();
		rightIceBlock.x = 2048 - rightIceBlock.width;
		rightIceBlock.y = j * 200;
		iceBlocks.push(rightIceBlock);
		self.addChild(rightIceBlock);
	}
	LK.on('tick', function () {
		player.move();
		for (var i = 0; i < bullets.length; i++) {
			bullets[i].move();
		}
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].move();
		}
		for (var i = 0; i < bullets.length; i++) {
			for (var j = 0; j < iceBlocks.length; j++) {
				if (bullets[i].intersects(iceBlocks[j])) {
					iceBlocks[j].destroyBlock();
					iceBlocks.splice(j, 1);
					bullets[i].destroy();
					bullets.splice(i, 1);
					break;
				}
			}
		}
	});
	player.on('down', function (obj) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		bullets.push(bullet);
		self.addChild(bullet);
	});
	var dragNode = null;
	stage.on('down', function (obj) {
		dragNode = player;
	});
	stage.on('move', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		if (dragNode) {
			dragNode.x = pos.x;
			dragNode.y = pos.y;
		}
	});
	stage.on('up', function (obj) {
		dragNode = null;
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,13 +1,25 @@
+var Player = (function () {
+	var instance;
+	function createInstance() {}
+	return {
+		getInstance: function () {
+			if (!instance) {
+				instance = createInstance();
+			}
+			return instance;
+		}
+	};
+})();
 var IceBlock = Container.expand(function () {
 	var self = Container.call(this);
 	var iceBlockGraphics = self.createAsset('iceBlock', 'Ice Block', .5, .5);
 	self.destroyBlock = function () {
 		self.destroy();
 	};
 });
-var Player = Container.expand(function () {
-	var self = Container.call(this);
+var self = Container.expand(function () {
+	self = Container.call(this);
 	var playerGraphics = self.createAsset('player', 'Player character', .5, .5);
 	self.move = function (direction) {
 		switch (direction) {
 			case 'up':
@@ -24,8 +36,9 @@
 				break;
 		}
 	};
 	self.shoot = function () {};
+	return self;
 });
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.createAsset('bullet', 'Bullet', .5, .5);
@@ -37,9 +50,9 @@
 	self.move = function () {};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
-	var player = self.addChild(new Player());
+	var player = self.addChild(Player.getInstance());
 	LK.on('keydown', function (event) {
 		switch (event.key) {
 			case 'ArrowUp':
 			case 'w':