var GiftDecoration = Container.expand(function () {
	var self = Container.call(this);
	var giftDecorationGraphics = self.createAsset('giftDecoration', 'Gift Decoration Graphics', .5, .5);
	self.update = function () {};
});
var ChristmasTree = Container.expand(function () {
	var self = Container.call(this);
	var treeGraphics = self.createAsset('christmasTree', 'Christmas Tree Graphics', .5, .5);
	self.update = function () {};
});
var Gift = Container.expand(function () {
	var self = Container.call(this);
	var giftGraphics = self.createAsset('gift', 'Gift Graphics', .5, .5);
	self.move = function () {};
	self.update = function () {};
});
var Santa = Container.expand(function () {
	var self = Container.call(this);
	var santaGraphics = self.createAsset('santa', 'Santa Graphics', .5, .5);
	self.move = function () {};
	self.update = function () {};
});
var Factory = Container.expand(function () {
	var self = Container.call(this);
	var factoryGraphics = self.createAsset('factory', 'Factory Graphics', .5, .5);
	self.productionValue = 5;
	self.upgradeCost = 1000;
	self.produceGift = function () {
		LK.setInterval(function () {
			LK.setScore(LK.getScore() + 5);
		}, 1000);
	};
	self.upgradeFactory = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.productionValue *= 2;
			self.upgradeCost *= 2;
		}
	};
	self.terrainUpgrades = [];
	self.upgradeTerrain = function () {
		self.terrainUpgradeCost = self.terrainUpgradeCost || 50;
		if (LK.getScore() >= self.terrainUpgradeCost) {
			LK.setScore(LK.getScore() - self.terrainUpgradeCost);
			var newUpgrade;
			if (Math.random() < 0.5) {
				newUpgrade = new ChristmasTree();
			} else {
				newUpgrade = new GiftDecoration();
			}
			newUpgrade.x = Math.random() * 2048;
			newUpgrade.y = Math.random() * 2732;
			self.terrainUpgrades.push(newUpgrade);
			LK.stage.addChild(newUpgrade);
			self.terrainUpgradeCost *= 2;
		}
	};
	self.update = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var gifts = [];
	var factories = [];
	var santa = self.addChild(new Santa());
	santa.x = 2048 / 2;
	santa.y = 2732 / 2;
	var factory = self.addChild(new Factory());
	factory.x = 2048 / 4;
	factory.y = 2732 / 4;
	factories.push(factory);
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	var purchaseFactoryButton = self.createAsset('purchaseFactoryButton', 'Purchase Factory Button', 0.5, 1);
	var upgradeTerrainButton = self.createAsset('upgradeTerrainButton', 'Upgrade Terrain Button', 0.5, 1);
	purchaseFactoryButton.x = 2048 / 2 - purchaseFactoryButton.width;
	purchaseFactoryButton.y = 2732 - purchaseFactoryButton.height / 2;
	upgradeTerrainButton.x = 2048 / 2 + upgradeTerrainButton.width;
	upgradeTerrainButton.y = 2732 - upgradeTerrainButton.height / 2;
	self.addChild(purchaseFactoryButton);
	self.addChild(upgradeTerrainButton);
	purchaseFactoryButton.on('down', function () {
		var factoryCost = 100;
		if (LK.getScore() >= factoryCost) {
			LK.setScore(LK.getScore() - factoryCost);
			var newFactory = self.addChild(new Factory());
			newFactory.x = 2048 / 4;
			newFactory.y = 2732 / 4 * factories.length;
			factories.push(newFactory);
			newFactory.produceGift();
			scoreTxt.setText(LK.getScore());
		}
	});
	upgradeTerrainButton.on('down', function () {
		factory.upgradeTerrain();
		scoreTxt.setText(LK.getScore());
	});
	LK.setScore(5);
	scoreTxt.setText(0);
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	santa.on('down', function (obj) {
		console.log('Santa was pressed');
	});
	factory.on('down', function (obj) {
		var upgradeButton = self.createAsset('upgradeButton', 'Upgrade Factory Button', 0.5, 1);
		upgradeButton.x = factory.x + factory.getChildAt(0).width / 2 + 20;
		upgradeButton.y = factory.y;
		self.addChild(upgradeButton);
		upgradeButton.on('down', function () {
			self.upgradeFactory();
			scoreTxt.setText(LK.getScore());
			upgradeButton.destroy();
		});
		factory.produceGift();
		scoreTxt.setText(LK.getScore());
	});
	LK.on('tick', function () {
		santa.update();
		for (var i = 0; i < factories.length; i++) {
			factories[i].update();
		}
		for (var i = 0; i < gifts.length; i++) {
			gifts[i].move();
			if (gifts[i].y < -50) {
				gifts[i].destroy();
				gifts.splice(i, 1);
			}
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -38,11 +38,11 @@
 		}
 	};
 	self.terrainUpgrades = [];
 	self.upgradeTerrain = function () {
-		var cost = 500;
-		if (LK.getScore() >= cost) {
-			LK.setScore(LK.getScore() - cost);
+		self.terrainUpgradeCost = self.terrainUpgradeCost || 50;
+		if (LK.getScore() >= self.terrainUpgradeCost) {
+			LK.setScore(LK.getScore() - self.terrainUpgradeCost);
 			var newUpgrade;
 			if (Math.random() < 0.5) {
 				newUpgrade = new ChristmasTree();
 			} else {
@@ -51,8 +51,9 @@
 			newUpgrade.x = Math.random() * 2048;
 			newUpgrade.y = Math.random() * 2732;
 			self.terrainUpgrades.push(newUpgrade);
 			LK.stage.addChild(newUpgrade);
+			self.terrainUpgradeCost *= 2;
 		}
 	};
 	self.update = function () {};
 });