/**** 
* Plugins
****/ 
var storage = LK.import("@upit/storage.v1");

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a simple ellipse as the bird
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bird physics
	self.y = 1200;
	self.x = 600;
	self.velocityY = 0;
	self.gravity = 2.5;
	self.flapStrength = -38;
	// Track lastY for possible future use
	self.lastY = self.y;
	// Update method: apply gravity and move bird
	self.update = function () {
		self.lastY = self.y;
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Prevent bird from going above the screen
		if (self.y < birdAsset.height / 2) {
			self.y = birdAsset.height / 2;
			self.velocityY = 0;
		}
		// Prevent bird from falling below the screen
		if (self.y > 2732 - birdAsset.height / 2) {
			self.y = 2732 - birdAsset.height / 2;
			self.velocityY = 0;
		}
	};
	// Flap method: called on tap
	self.flap = function () {
		self.velocityY = self.flapStrength;
	};
	return self;
});
// Cloud class for moving clouds across the screen
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	// Attach cloud asset
	var cloudAsset = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set initial position and speed
	self.x = 2048 + 200; // Start just off the right edge
	// Allow clouds to spawn anywhere vertically, including near the top and bottom
	self.y = Math.random() * (2732 - cloudAsset.height) + cloudAsset.height / 2;
	// 40% chance to be a fast cloud
	if (Math.random() < 0.4) {
		self.speed = 5 + Math.random() * 2; // Fast cloud
	} else {
		self.speed = 2 + Math.random() * 2; // Normal cloud
	}
	self.lastX = self.x;
	self.update = function () {
		self.lastX = self.x;
		self.x -= self.speed;
		// If cloud moves off left edge, reset to right
		if (self.x < -cloudAsset.width / 2) {
			self.x = 2048 + cloudAsset.width / 2;
			// Allow clouds to respawn anywhere vertically, including near the top and bottom
			self.y = Math.random() * (2732 - cloudAsset.height) + cloudAsset.height / 2;
			// 40% chance to be a fast cloud
			if (Math.random() < 0.4) {
				self.speed = 5 + Math.random() * 2; // Fast cloud
			} else {
				self.speed = 2 + Math.random() * 2; // Normal cloud
			}
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Add background image behind the bird
var background = LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(background);
// Score variables
var survivalTime = 0; // in seconds
// Import storage plugin for persistent best score
// Best score persistent storage
var bestScore = storage.get('bestScore') || 0;
// Best score text at top center
var bestScoreText = new Text2('BEST: ' + bestScore, {
	size: 100,
	fill: "#fff"
});
bestScoreText.anchor.set(0.5, 0); // center-top
LK.gui.top.addChild(bestScoreText);
// Current score at top right
var scoreText = new Text2('0', {
	size: 100,
	fill: "#fff"
});
scoreText.anchor.set(1, 0); // right-top
LK.gui.topRight.addChild(scoreText);
// Add clouds behind the bird
var clouds = [];
for (var i = 0; i < 4; i++) {
	var cloud = new Cloud();
	// Stagger clouds horizontally, with more overlap for denser effect
	cloud.x = 400 + i * 480;
	clouds.push(cloud);
	game.addChild(cloud);
}
// Create the bird and add to the game
var bird = new Bird();
game.addChild(bird);
// Timer to update score every second
var scoreTimer = LK.setInterval(function () {
	survivalTime += 1;
	LK.setScore(survivalTime);
	scoreText.setText(survivalTime);
}, 1000);
// Tap anywhere to make the bird flap
game.down = function (x, y, obj) {
	bird.flap();
};
// Update clouds every frame
game.update = function () {
	for (var i = 0; i < clouds.length; i++) {
		clouds[i].update();
		// Check for collision between bird and cloud
		if (clouds[i].lastWasIntersecting === undefined) clouds[i].lastWasIntersecting = false;
		var nowIntersecting = bird.intersects(clouds[i]);
		if (!clouds[i].lastWasIntersecting && nowIntersecting) {
			// Stop score timer
			LK.clearInterval(scoreTimer);
			// Update best score if needed
			if (survivalTime > bestScore) {
				bestScore = survivalTime;
				storage.set('bestScore', bestScore);
				bestScoreText.setText('BEST: ' + bestScore);
			}
			// Set score to survival time for game over screen
			LK.setScore(survivalTime);
			// Show game over screen
			LK.showGameOver();
			return;
		}
		clouds[i].lastWasIntersecting = nowIntersecting;
	}
	// Check for collision with top or bottom of the screen
	var birdAssetHeight = 200; // matches bird asset height
	if (bird.lastY > birdAssetHeight / 2 && bird.y <= birdAssetHeight / 2 || bird.lastY < 2732 - birdAssetHeight / 2 && bird.y >= 2732 - birdAssetHeight / 2) {
		LK.clearInterval(scoreTimer);
		// Update best score if needed
		if (survivalTime > bestScore) {
			bestScore = survivalTime;
			storage.set('bestScore', bestScore);
			bestScoreText.setText('BEST: ' + bestScore);
		}
		LK.setScore(survivalTime);
		LK.showGameOver();
		return;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -1,5 +1,10 @@
 /**** 
+* Plugins
+****/ 
+var storage = LK.import("@upit/storage.v1");
+
+/**** 
 * Classes
 ****/ 
 var Bird = Container.expand(function () {
 	var self = Container.call(this);
@@ -95,8 +100,9 @@
 });
 game.addChild(background);
 // Score variables
 var survivalTime = 0; // in seconds
+// Import storage plugin for persistent best score
 // Best score persistent storage
 var bestScore = storage.get('bestScore') || 0;
 // Best score text at top center
 var bestScoreText = new Text2('BEST: ' + bestScore, {