var Santa = Container.expand(function () {
	var self = Container.call(this);
	var santaGraphics = self.createAsset('santa', 'Santa character', .5, .5);
	self.speed = 5;
	self.jump = function () {};
	self.move = function () {};
});
var House = Container.expand(function () {
	var self = Container.call(this);
	var houseGraphics = self.createAsset('house', 'House object', .5, .5);
	self.speed = -5;
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	LK.stageContainer.setBackgroundColor(0x000000);
	var gameContainer = new Container();
	self.addChild(gameContainer);
	var santa = gameContainer.addChild(new Santa());
	santa.x = 2048 / 2;
	santa.y = 2732 / 2;
	var houses = [];
	self.spawnHouse = function () {
		var newHouse = new House();
		newHouse.x = 2048;
		var lastHouseY = houses.length > 0 ? houses[houses.length - 1].y : 2732 / 2;
		var gameHeightThird = 2732 / 3;
		newHouse.y = lastHouseY - (Math.random() * (gameHeightThird * 2) + gameHeightThird);
		houses.push(newHouse);
		gameContainer.addChild(newHouse);
	};
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	for (var i = 0; i < 8; i++) {
		self.spawnHouse();
	}
	var tickOffset = 0;
	LK.on('tick', function () {
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		for (var a = houses.length - 1; a >= 0; a--) {
			if (houses[a].x < -50) {
				houses[a].destroy();
				houses.splice(a, 1);
			}
		}
	});
	santa.on('down', function (obj) {
		santa.jump();
	});
});

===================================================================
--- original.js
+++ change.js
@@ -8,11 +8,8 @@
 var House = Container.expand(function () {
 	var self = Container.call(this);
 	var houseGraphics = self.createAsset('house', 'House object', .5, .5);
 	self.speed = -5;
-	self.move = function () {
-		self.x += self.speed;
-	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	LK.stageContainer.setBackgroundColor(0x000000);
@@ -47,9 +44,8 @@
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.showGameOver();
 		}
 		for (var a = houses.length - 1; a >= 0; a--) {
-			houses[a].move();
 			if (houses[a].x < -50) {
 				houses[a].destroy();
 				houses.splice(a, 1);
 			}