===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,197 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Airplane = Container.expand(function () {
+	var self = Container.call(this);
+	var airplaneGraphics = self.attachAsset('airplane', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.velocity = 0;
+	self.gravity = 0.8;
+	self.jumpPower = -12;
+	self.maxVelocity = 15;
+	self.update = function () {
+		// Apply gravity
+		self.velocity += self.gravity;
+		// Limit velocity
+		if (self.velocity > self.maxVelocity) {
+			self.velocity = self.maxVelocity;
+		}
+		if (self.velocity < -self.maxVelocity) {
+			self.velocity = -self.maxVelocity;
+		}
+		// Update position
+		self.y += self.velocity;
+		// Rotate airplane based on velocity for visual effect
+		airplaneGraphics.rotation = Math.max(-0.5, Math.min(0.5, self.velocity * 0.05));
+		// Keep airplane within screen bounds
+		if (self.y < 0) {
+			self.y = 0;
+			self.velocity = 0;
+		}
+		if (self.y > 2732) {
+			self.y = 2732;
+			self.velocity = 0;
+		}
+	};
+	self.jump = function () {
+		self.velocity = self.jumpPower;
+		LK.getSound('fly').play();
+	};
+	return self;
+});
+var Building = Container.expand(function (topHeight, bottomHeight, gapY) {
+	var self = Container.call(this);
+	// Top building
+	var topBuilding = self.attachAsset('building', {
+		anchorX: 0,
+		anchorY: 1,
+		scaleY: topHeight / 800
+	});
+	topBuilding.y = gapY - 150; // Gap size of 300px
+	// Bottom building
+	var bottomBuilding = self.attachAsset('building', {
+		anchorX: 0,
+		anchorY: 0,
+		scaleY: bottomHeight / 800
+	});
+	bottomBuilding.y = gapY + 150;
+	self.speed = -4;
+	self.passed = false;
+	self.update = function () {
+		self.x += self.speed;
+	};
+	self.checkCollision = function (airplane) {
+		var airplaneLeft = airplane.x - 60;
+		var airplaneRight = airplane.x + 60;
+		var airplaneTop = airplane.y - 30;
+		var airplaneBottom = airplane.y + 30;
+		var buildingLeft = self.x;
+		var buildingRight = self.x + 200;
+		// Check if airplane is within building's x range
+		if (airplaneRight > buildingLeft && airplaneLeft < buildingRight) {
+			// Check collision with top building
+			if (airplaneTop < topBuilding.y) {
+				return true;
+			}
+			// Check collision with bottom building
+			if (airplaneBottom > bottomBuilding.y) {
+				return true;
+			}
+		}
+		return false;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87CEEB
+});
+
+/**** 
+* Game Code
+****/ 
+// Game variables
+var airplane;
+var buildings = [];
+var gameSpeed = 4;
+var buildingSpawnTimer = 0;
+var buildingSpawnInterval = 90; // frames between buildings
+var gameStarted = false;
+// UI Elements
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+var instructionTxt = new Text2('TAP TO FLY', {
+	size: 80,
+	fill: 0xFFFFFF
+});
+instructionTxt.anchor.set(0.5, 0.5);
+instructionTxt.x = 1024;
+instructionTxt.y = 1366;
+game.addChild(instructionTxt);
+// Initialize airplane
+airplane = game.addChild(new Airplane());
+airplane.x = 400;
+airplane.y = 1366;
+// Update score display
+function updateScore() {
+	scoreTxt.setText(LK.getScore());
+}
+// Spawn new building
+function spawnBuilding() {
+	var gapY = Math.random() * (2000 - 700) + 700; // Gap between y=700 and y=2000
+	var topHeight = gapY - 150;
+	var bottomHeight = 2732 - (gapY + 150);
+	var building = new Building(topHeight, bottomHeight, gapY);
+	building.x = 2048 + 200; // Start off-screen to the right
+	buildings.push(building);
+	game.addChild(building);
+}
+// Game input handling
+game.down = function (x, y, obj) {
+	if (!gameStarted) {
+		gameStarted = true;
+		instructionTxt.visible = false;
+		// Spawn first building
+		spawnBuilding();
+	}
+	airplane.jump();
+};
+// Main game loop
+game.update = function () {
+	if (!gameStarted) return;
+	// Update building spawn timer
+	buildingSpawnTimer++;
+	if (buildingSpawnTimer >= buildingSpawnInterval) {
+		buildingSpawnTimer = 0;
+		spawnBuilding();
+		// Gradually increase difficulty
+		if (buildingSpawnInterval > 60) {
+			buildingSpawnInterval -= 0.2;
+		}
+	}
+	// Check collisions and update buildings
+	for (var i = buildings.length - 1; i >= 0; i--) {
+		var building = buildings[i];
+		// Check collision
+		if (building.checkCollision(airplane)) {
+			LK.getSound('crash').play();
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+			return;
+		}
+		// Check if airplane passed building (score)
+		if (!building.passed && building.x + 200 < airplane.x) {
+			building.passed = true;
+			LK.setScore(LK.getScore() + 1);
+			updateScore();
+		}
+		// Remove buildings that are off-screen
+		if (building.x < -400) {
+			building.destroy();
+			buildings.splice(i, 1);
+		}
+	}
+	// Check ground and ceiling collision
+	if (airplane.y <= 30 || airplane.y >= 2702) {
+		LK.getSound('crash').play();
+		LK.effects.flashScreen(0xff0000, 1000);
+		LK.showGameOver();
+		return;
+	}
+};
+// Initialize score display
+updateScore();
\ No newline at end of file