===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,296 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Car class
+var Car = Container.expand(function () {
+	var self = Container.call(this);
+	var carGfx = self.attachAsset('car', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = carGfx.width;
+	self.height = carGfx.height;
+	self.speed = 6 + Math.random() * 2; // px per tick
+	self.state = 'arriving'; // arriving, refueling, leaving
+	self.refuelTicks = 0;
+	self.refuelTime = 60 + Math.floor(Math.random() * 60); // 1-2 seconds
+	self.pumpX = 0;
+	self.pumpY = 0;
+	self.update = function () {
+		if (self.state === 'arriving') {
+			// Move car towards pump
+			var dx = self.pumpX - self.x;
+			var dy = self.pumpY - self.y;
+			var dist = Math.sqrt(dx * dx + dy * dy);
+			if (dist < 10) {
+				self.x = self.pumpX;
+				self.y = self.pumpY;
+				self.state = 'refueling';
+				self.refuelTicks = 0;
+			} else {
+				self.x += dx / dist * self.speed;
+				self.y += dy / dist * self.speed;
+			}
+		} else if (self.state === 'refueling') {
+			self.refuelTicks++;
+			if (self.refuelTicks >= self.refuelTime) {
+				self.state = 'leaving';
+				self.leaveTargetX = 2200; // off screen right
+				self.leaveTargetY = self.y;
+			}
+		} else if (self.state === 'leaving') {
+			self.x += self.speed * 1.2;
+			if (self.x > 2200) {
+				self.destroyed = true;
+			}
+		}
+	};
+	return self;
+});
+// Pump class
+var Pump = Container.expand(function () {
+	var self = Container.call(this);
+	var pumpGfx = self.attachAsset('pump', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	self.width = pumpGfx.width;
+	self.height = pumpGfx.height;
+	self.car = null; // Car currently at this pump
+	self.isBusy = function () {
+		return !!self.car;
+	};
+	return self;
+});
+// Gas Station Floor class
+var StationFloor = Container.expand(function () {
+	var self = Container.call(this);
+	self.floorNum = 1; // 1 = base, 2,3,4 = upgrades
+	self.pumps = [];
+	// Floor graphics
+	var floorAsset = self.attachAsset(self.floorNum === 1 ? 'stationBase' : 'stationFloor', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	self.width = floorAsset.width;
+	self.height = floorAsset.height;
+	// Place pumps
+	self.initPumps = function () {
+		// 2 pumps per floor
+		for (var i = 0; i < 2; i++) {
+			var pump = new Pump();
+			pump.x = -200 + i * 400;
+			pump.y = -10;
+			self.addChild(pump);
+			self.pumps.push(pump);
+		}
+	};
+	self.initPumps();
+	return self;
+});
+// Upgrade Button class
+var UpgradeButton = Container.expand(function () {
+	var self = Container.call(this);
+	var btnGfx = self.attachAsset('upgradeBtn', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var icon = self.attachAsset('upgradeIcon', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		x: -160,
+		y: 0
+	});
+	self.label = new Text2('Upgrade\n$100', {
+		size: 60,
+		fill: 0x333333,
+		align: "center"
+	});
+	self.label.anchor.set(0.5, 0.5);
+	self.label.x = 60;
+	self.label.y = 0;
+	self.addChild(self.label);
+	self.setEnabled = function (enabled) {
+		btnGfx.alpha = enabled ? 1 : 0.5;
+		self.interactive = enabled;
+		self.buttonMode = enabled;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x1a2a3a
+});
+
+/**** 
+* Game Code
+****/ 
+// Upgrade icon
+// Upgrade button
+// Car
+// Pump
+// Gas station floor (for floors 2-4)
+// Gas station base (floor 1)
+// Game state variables
+var money = 0;
+var floors = [];
+var cars = [];
+var maxFloors = 4;
+var floorCount = 2; // Start with 2 floors
+var carSpawnTimer = 0;
+var carSpawnInterval = 90; // ticks between car spawns
+var upgradeCost = 100;
+var upgradeBtn;
+var moneyTxt;
+var floorYStart = 2200; // y position of base floor
+var floorSpacing = 260; // vertical space between floors
+// Money display
+moneyTxt = new Text2('$0', {
+	size: 100,
+	fill: 0xFFFFFF
+});
+moneyTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(moneyTxt);
+// Place floors
+function placeFloors() {
+	// Remove all floors
+	for (var i = 0; i < floors.length; i++) {
+		floors[i].destroy();
+	}
+	floors = [];
+	for (var f = 0; f < floorCount; f++) {
+		var floor = new StationFloor();
+		floor.floorNum = f + 1;
+		// Set correct asset for base or upper floors
+		var assetId = f === 0 ? 'stationBase' : 'stationFloor';
+		floor.children[0].setAsset(assetId);
+		floor.x = 2048 / 2;
+		floor.y = floorYStart - f * floorSpacing;
+		game.addChild(floor);
+		floors.push(floor);
+	}
+}
+placeFloors();
+// Upgrade button
+upgradeBtn = new UpgradeButton();
+upgradeBtn.x = 2048 / 2;
+upgradeBtn.y = 2732 - 180;
+upgradeBtn.setEnabled(true);
+LK.gui.bottom.addChild(upgradeBtn);
+// Update upgrade button label
+function updateUpgradeBtn() {
+	if (floorCount < maxFloors) {
+		upgradeBtn.label.setText('Upgrade\n$' + upgradeCost);
+		upgradeBtn.setEnabled(money >= upgradeCost);
+	} else {
+		upgradeBtn.label.setText('Maxed');
+		upgradeBtn.setEnabled(false);
+	}
+}
+updateUpgradeBtn();
+// Handle upgrade button press
+upgradeBtn.down = function (x, y, obj) {
+	if (money >= upgradeCost && floorCount < maxFloors) {
+		money -= upgradeCost;
+		floorCount++;
+		upgradeCost = Math.floor(upgradeCost * 2.2);
+		placeFloors();
+		updateUpgradeBtn();
+		updateMoneyTxt();
+		// Animate button
+		tween(upgradeBtn, {
+			scaleX: 1.15,
+			scaleY: 1.15
+		}, {
+			duration: 120,
+			easing: tween.easeOut,
+			onFinish: function onFinish() {
+				tween(upgradeBtn, {
+					scaleX: 1,
+					scaleY: 1
+				}, {
+					duration: 120,
+					easing: tween.easeIn
+				});
+			}
+		});
+	}
+};
+// Update money text
+function updateMoneyTxt() {
+	moneyTxt.setText('$' + money);
+}
+// Find a free pump, returns {floor, pump} or null
+function findFreePump() {
+	for (var f = 0; f < floors.length; f++) {
+		var floor = floors[f];
+		for (var p = 0; p < floor.pumps.length; p++) {
+			if (!floor.pumps[p].isBusy()) {
+				return {
+					floor: floor,
+					pump: floor.pumps[p],
+					floorIndex: f,
+					pumpIndex: p
+				};
+			}
+		}
+	}
+	return null;
+}
+// Spawn a car at a free pump
+function spawnCar() {
+	var spot = findFreePump();
+	if (!spot) return;
+	var car = new Car();
+	// Start off screen left
+	car.x = -200;
+	car.y = spot.floor.y - 60;
+	car.pumpX = spot.floor.x - 200 + spot.pumpIndex * 400;
+	car.pumpY = spot.floor.y - 60;
+	spot.pump.car = car;
+	game.addChild(car);
+	cars.push({
+		car: car,
+		pump: spot.pump
+	});
+}
+// Game update loop
+game.update = function () {
+	// Spawn cars
+	carSpawnTimer++;
+	if (carSpawnTimer >= carSpawnInterval) {
+		carSpawnTimer = 0;
+		spawnCar();
+	}
+	// Update cars
+	for (var i = cars.length - 1; i >= 0; i--) {
+		var carObj = cars[i];
+		var car = carObj.car;
+		car.update();
+		// If car finished refueling, give money and set pump free
+		if (car.state === 'leaving' && !carObj.paid) {
+			money += 10 + 5 * (carObj.pump.parent.floorNum - 1);
+			updateMoneyTxt();
+			carObj.paid = true;
+			carObj.pump.car = null;
+			updateUpgradeBtn();
+		}
+		// Remove car if destroyed
+		if (car.destroyed) {
+			car.destroy();
+			cars.splice(i, 1);
+		}
+	}
+};
+// Initial money
+money = 50;
+updateMoneyTxt();
+updateUpgradeBtn();
\ No newline at end of file