/**** 
* Classes
****/
var UpgradeCostDisplay = Container.expand(function () {
	var self = Container.call(this);
	self.text = new Text2('', {
		size: 50,
		fill: "#ffffff"
	});
	self.text.anchor.set(0.5, 0);
	self.addChild(self.text);
	self.updateCost = function (cost) {
		self.text.setText('Cost: ' + (cost ? cost : 'Max'));
	};
});
var Peach = Container.expand(function () {
	var self = Container.call(this);
	var peachGraphics = self.attachAsset('peach', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.interactive = true;
	self.on('down', function () {
		game.peachClicked();
	});
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.vx = Math.random() * 10 - 5;
	self.vy = Math.random() * -10 - 5;
	self.gravity = 0.5;
	self.move = function () {
		self.x += self.vx;
		self.y += self.vy;
		self.vy += self.gravity;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
var UpgradeButton = Container.expand(function () {
	var self = Container.call(this);
	var buttonGraphics = self.attachAsset('upgradeButton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.interactive = true;
	self.on('down', function () {
		game.purchaseUpgrade();
	});
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background
});

/**** 
* Game Code
****/
game.coins = 0;
game.upgradeCosts = [100, 200, 500, 1000, 1500, 2000];
game.currentUpgradeIndex = 0;
game.upgradeCost = game.upgradeCosts[game.currentUpgradeIndex];
game.upgradeLevel = 1;
game.peach = game.addChild(new Peach());
game.peach.x = 2048 / 2;
game.peach.y = 2732 / 2;
game.upgradeButton = game.addChild(new UpgradeButton());
game.upgradeButton.x = 2048 / 2;
game.upgradeButton.y = 2732 - 200;
game.upgradeCostDisplay = game.addChild(new UpgradeCostDisplay());
game.upgradeCostDisplay.x = game.upgradeButton.x + 250;
game.upgradeCostDisplay.y = game.upgradeButton.y;
game.upgradeCostDisplay.updateCost(game.upgradeCost);
game.coinsText = new Text2('Coins: 0', {
	size: 100,
	fill: "#ffffff"
});
game.coinsText.anchor.set(0.5, 0);
LK.gui.top.addChild(game.coinsText);
game.peachClicked = function () {
	var coin = game.addChild(new Coin());
	coin.x = game.peach.x;
	coin.y = game.peach.y;
	game.coins += game.upgradeLevel;
	game.updateCoinsText();
};
game.purchaseUpgrade = function () {
	if (game.coins >= game.upgradeCost) {
		game.coins -= game.upgradeCost;
		game.upgradeLevel++;
		game.currentUpgradeIndex++;
		if (game.currentUpgradeIndex < game.upgradeCosts.length) {
			game.upgradeCost = game.upgradeCosts[game.currentUpgradeIndex];
		} else {
			game.upgradeCost = null; // No more upgrades available
		}
		game.updateCoinsText();
	}
};
game.updateCoinsText = function () {
	game.coinsText.setText('Coins: ' + game.coins);
	game.upgradeCostDisplay.updateCost(game.upgradeCost);
};
LK.on('tick', function () {
	var children = game.children;
	for (var i = children.length - 1; i >= 0; i--) {
		if (children[i] instanceof Coin) {
			children[i].move();
		}
	}
});

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,19 @@
 /**** 
 * Classes
 ****/
+var UpgradeCostDisplay = Container.expand(function () {
+	var self = Container.call(this);
+	self.text = new Text2('', {
+		size: 50,
+		fill: "#ffffff"
+	});
+	self.text.anchor.set(0.5, 0);
+	self.addChild(self.text);
+	self.updateCost = function (cost) {
+		self.text.setText('Cost: ' + (cost ? cost : 'Max'));
+	};
+});
 var Peach = Container.expand(function () {
 	var self = Container.call(this);
 	var peachGraphics = self.attachAsset('peach', {
 		anchorX: 0.5,
@@ -52,26 +64,22 @@
 /**** 
 * Game Code
 ****/
 game.coins = 0;
-game.upgradeCost = 10;
+game.upgradeCosts = [100, 200, 500, 1000, 1500, 2000];
+game.currentUpgradeIndex = 0;
+game.upgradeCost = game.upgradeCosts[game.currentUpgradeIndex];
 game.upgradeLevel = 1;
 game.peach = game.addChild(new Peach());
 game.peach.x = 2048 / 2;
 game.peach.y = 2732 / 2;
 game.upgradeButton = game.addChild(new UpgradeButton());
 game.upgradeButton.x = 2048 / 2;
 game.upgradeButton.y = 2732 - 200;
-// Create and position the upgrade cost text
-var upgradeCostText = new Text2('Cost: ' + game.upgradeCost, {
-	size: 50,
-	fill: "#ffffff"
-});
-upgradeCostText.anchor.set(0.5, 0);
-upgradeCostText.x = game.upgradeButton.x;
-upgradeCostText.y = game.upgradeButton.y + 250;
-LK.gui.top.addChild(upgradeCostText);
-game.upgradeCostText = upgradeCostText;
+game.upgradeCostDisplay = game.addChild(new UpgradeCostDisplay());
+game.upgradeCostDisplay.x = game.upgradeButton.x + 250;
+game.upgradeCostDisplay.y = game.upgradeButton.y;
+game.upgradeCostDisplay.updateCost(game.upgradeCost);
 game.coinsText = new Text2('Coins: 0', {
 	size: 100,
 	fill: "#ffffff"
 });
@@ -87,18 +95,20 @@
 game.purchaseUpgrade = function () {
 	if (game.coins >= game.upgradeCost) {
 		game.coins -= game.upgradeCost;
 		game.upgradeLevel++;
-		game.upgradeCost *= 2;
-		game.updateCoinsText();
-		// Update the upgrade cost text
-		if (game.upgradeCostText) {
-			game.upgradeCostText.setText('Cost: ' + game.upgradeCost);
+		game.currentUpgradeIndex++;
+		if (game.currentUpgradeIndex < game.upgradeCosts.length) {
+			game.upgradeCost = game.upgradeCosts[game.currentUpgradeIndex];
+		} else {
+			game.upgradeCost = null; // No more upgrades available
 		}
+		game.updateCoinsText();
 	}
 };
 game.updateCoinsText = function () {
 	game.coinsText.setText('Coins: ' + game.coins);
+	game.upgradeCostDisplay.updateCost(game.upgradeCost);
 };
 LK.on('tick', function () {
 	var children = game.children;
 	for (var i = children.length - 1; i >= 0; i--) {