/**** 
* Classes
****/ 
var Business = Container.expand(function () {
	var self = Container.call(this);
	var businessGraphics = self.attachAsset('business', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.level = 1; // Level of the business
	self.earning = 1; // Money earned per second
	self.upgradeCost = 10; // Cost to upgrade the business
	self.update = function () {
		// Earn money every second
		if (LK.ticks % 60 == 0) {
			LK.setScore(LK.getScore() + self.earning);
			scoreTxt.setText('Money: ' + LK.getScore());
		}
	};
	// Upgrade the business to earn more money
	self.upgrade = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.earning *= 2;
			self.upgradeCost *= 2;
			levelTxt.setText('Money: ' + LK.getScore());
		}
	};
	// Buy a business
	self.buy = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			var newBusiness = new Business();
			newBusiness.x = businesses.length * 200;
			newBusiness.y = 0;
			businesses.push(newBusiness);
			square.addChild(newBusiness);
		}
	};
	// Event handler called when a press happens on element.
	self.down = function (x, y, obj) {
		self.upgrade();
	};
});
var Commercial = Container.expand(function () {
	var self = Container.call(this);
	var commercialGraphics = self.attachAsset('commercial', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.level = 1; // Level of the commercial building
	self.earning = 1; // Money earned per second
	self.upgradeCost = 10; // Cost to upgrade the commercial building
	self.update = function () {
		// Earn money every second
		if (LK.ticks % 60 == 0) {
			LK.setScore(LK.getScore() + self.earning);
			scoreTxt.setText(LK.getScore());
		}
	};
	// Upgrade the commercial building to earn more money
	self.upgrade = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.level += 1;
			self.earning *= 2;
			self.upgradeCost *= 2;
			levelTxt.setText('Level: ' + self.level);
		}
	};
	// Buy a residential building
	self.buy = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			var newResidential = new Residential();
			newResidential.x = residentials.length * 200;
			newResidential.y = 0;
			residentials.push(newResidential);
			square.addChild(newResidential);
		}
	};
	// Buy an industrial building
	self.buy = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			var newIndustrial = new Industrial();
			newIndustrial.x = industrials.length * 200;
			newIndustrial.y = 0;
			industrials.push(newIndustrial);
			square.addChild(newIndustrial);
		}
	};
	// Buy a commercial building
	self.buy = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			var newCommercial = new Commercial();
			newCommercial.x = commercials.length * 200;
			newCommercial.y = 0;
			commercials.push(newCommercial);
			square.addChild(newCommercial);
		}
	};
	// Event handler called when a press happens on element.
	self.down = function (x, y, obj) {
		self.upgrade();
	};
});
// Earn money every second
var Industrial = Container.expand(function () {
	var self = Container.call(this);
	var industrialGraphics = self.attachAsset('industrial', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.level = 1; // Level of the industrial building
	self.production = 1; // Production of the industrial building
	self.upgradeCost = 10; // Cost to upgrade the industrial building
	self.update = function () {
		// Industrial logic goes here
		// Increase production every second
		if (LK.ticks % 60 == 0) {
			self.production += self.level;
			productionTxt.setText('Production: ' + self.production);
		}
	};
	// Upgrade the industrial building to increase production
	self.upgrade = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.level += 1;
			self.upgradeCost *= 2;
			levelTxt.setText('Level: ' + self.level);
		}
	};
	// Event handler called when a press happens on element.
	self.down = function (x, y, obj) {
		self.upgrade();
	};
});
// Earn money every second
var Residential = Container.expand(function () {
	var self = Container.call(this);
	var residentialGraphics = self.attachAsset('residential', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.level = 1; // Level of the residential building
	self.population = 1; // Population of the residential building
	self.upgradeCost = 10; // Cost to upgrade the residential building
	self.update = function () {
		// Residential logic goes here
		// Increase population every second
		if (LK.ticks % 60 == 0) {
			self.population += self.level;
			populationTxt.setText('Population: ' + self.population);
		}
	};
	// Upgrade the residential building to increase population
	self.upgrade = function () {
		if (LK.getScore() >= self.upgradeCost) {
			LK.setScore(LK.getScore() - self.upgradeCost);
			self.level += 1;
			self.upgradeCost *= 2;
			levelTxt.setText('Level: ' + self.level);
		}
	};
	// Event handler called when a press happens on element.
	self.down = function (x, y, obj) {
		self.upgrade();
	};
});

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

/**** 
* Game Code
****/ 
// Create a square where all the buildings will be placed
var square = new Container();
game.addChild(square);
square.x = 1024;
square.y = 1366;
// Initialize buildings as empty arrays
var businesses = [];
var commercials = [];
var industrials = [];
var residentials = [];
var scoreTxt = new Text2('Money: 0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var levelTxt = new Text2('Level: 1', {
	size: 100,
	fill: 0xFFFFFF
});
levelTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(levelTxt);
var productionTxt = new Text2('Production: 1', {
	size: 100,
	fill: 0xFFFFFF
});
productionTxt.anchor.set(0.5, 0);
LK.gui.bottomLeft.addChild(productionTxt);
var populationTxt = new Text2('Population: 1', {
	size: 100,
	fill: 0xFFFFFF
});
populationTxt.anchor.set(0.5, 0);
LK.gui.bottomRight.addChild(populationTxt);

===================================================================
--- original.js
+++ change.js
@@ -25,8 +25,19 @@
 			self.upgradeCost *= 2;
 			levelTxt.setText('Money: ' + LK.getScore());
 		}
 	};
+	// Buy a business
+	self.buy = function () {
+		if (LK.getScore() >= self.upgradeCost) {
+			LK.setScore(LK.getScore() - self.upgradeCost);
+			var newBusiness = new Business();
+			newBusiness.x = businesses.length * 200;
+			newBusiness.y = 0;
+			businesses.push(newBusiness);
+			square.addChild(newBusiness);
+		}
+	};
 	// Event handler called when a press happens on element.
 	self.down = function (x, y, obj) {
 		self.upgrade();
 	};
@@ -56,8 +67,41 @@
 			self.upgradeCost *= 2;
 			levelTxt.setText('Level: ' + self.level);
 		}
 	};
+	// Buy a residential building
+	self.buy = function () {
+		if (LK.getScore() >= self.upgradeCost) {
+			LK.setScore(LK.getScore() - self.upgradeCost);
+			var newResidential = new Residential();
+			newResidential.x = residentials.length * 200;
+			newResidential.y = 0;
+			residentials.push(newResidential);
+			square.addChild(newResidential);
+		}
+	};
+	// Buy an industrial building
+	self.buy = function () {
+		if (LK.getScore() >= self.upgradeCost) {
+			LK.setScore(LK.getScore() - self.upgradeCost);
+			var newIndustrial = new Industrial();
+			newIndustrial.x = industrials.length * 200;
+			newIndustrial.y = 0;
+			industrials.push(newIndustrial);
+			square.addChild(newIndustrial);
+		}
+	};
+	// Buy a commercial building
+	self.buy = function () {
+		if (LK.getScore() >= self.upgradeCost) {
+			LK.setScore(LK.getScore() - self.upgradeCost);
+			var newCommercial = new Commercial();
+			newCommercial.x = commercials.length * 200;
+			newCommercial.y = 0;
+			commercials.push(newCommercial);
+			square.addChild(newCommercial);
+		}
+	};
 	// Event handler called when a press happens on element.
 	self.down = function (x, y, obj) {
 		self.upgrade();
 	};
@@ -141,24 +185,13 @@
 var square = new Container();
 game.addChild(square);
 square.x = 1024;
 square.y = 1366;
-// Add the business to the square
-var business = square.addChild(new Business());
-business.x = 0;
-business.y = 0;
-// Add the commercial building to the square
-var commercial = square.addChild(new Commercial());
-commercial.x = 200;
-commercial.y = 0;
-// Add the industrial building to the square
-var industrial = square.addChild(new Industrial());
-industrial.x = 400;
-industrial.y = 0;
-// Add the residential building to the square
-var residential = square.addChild(new Residential());
-residential.x = 600;
-residential.y = 0;
+// Initialize buildings as empty arrays
+var businesses = [];
+var commercials = [];
+var industrials = [];
+var residentials = [];
 var scoreTxt = new Text2('Money: 0', {
 	size: 150,
 	fill: 0xFFFFFF
 });