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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.6;
	self.flapStrength = -16;
	self.maxVelocity = 15;
	self.flap = function () {
		self.velocity = self.flapStrength;
		LK.getSound('flap').play();
		// Animation for flap
		tween(birdGraphics, {
			rotation: -0.5
		}, {
			duration: 150
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 300
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		// Limit velocity
		if (self.velocity > self.maxVelocity) {
			self.velocity = self.maxVelocity;
		}
		// Update position
		self.y += self.velocity;
		// Rotate bird based on velocity
		var targetRotation = Math.min(Math.max(self.velocity * 0.1, -0.5), 1.5);
		birdGraphics.rotation = targetRotation;
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.gapSize = 400;
	self.scored = false;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setupPipes = function (gapCenterY) {
		self.topPipe.y = gapCenterY - self.gapSize / 2;
		self.bottomPipe.y = gapCenterY + self.gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game variables
var bird;
var pipes = [];
var ground;
var gameStarted = false;
var gameOver = false;
var pipeSpawnTimer = 0;
var pipeSpawnDelay = 150; // frames between pipe spawns
var initialPipeSpawnDelay = 60; // frames until first pipe spawns
// UI elements
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var instructionTxt = new Text2('TAP TO FLAP', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 2048 / 2;
instructionTxt.y = 2732 / 2 + 200;
game.addChild(instructionTxt);
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 2732 / 2;
// Create ground - duplicated side by side for continuous ground
var groundTiles = [];
for (var i = 0; i < 3; i++) {
	var groundTile = game.addChild(LK.getAsset('ground', {
		anchorX: 0,
		anchorY: 1
	}));
	groundTile.x = i * 291; // Position tiles side by side based on ground width
	groundTile.y = 2732;
	groundTiles.push(groundTile);
}
ground = groundTiles[0]; // Keep reference to first tile for backward compatibility
function startGame() {
	gameStarted = true;
	instructionTxt.visible = false;
	bird.flap();
}
function spawnPipe() {
	var pipe = new Pipe();
	var minY = 400;
	var maxY = 2732 - 400;
	var gapCenterY = minY + Math.random() * (maxY - minY);
	pipe.x = 2048 + 60;
	pipe.setupPipes(gapCenterY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function checkCollisions() {
	// Check ground collision - check against all ground tiles
	for (var g = 0; g < groundTiles.length; g++) {
		if (bird.y + 30 >= groundTiles[g].y) {
			return true;
		}
	}
	// Check ceiling collision
	if (bird.y - 30 <= 0) {
		return true;
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Simple collision detection with pipes
		var birdLeft = bird.x - 30;
		var birdRight = bird.x + 30;
		var birdTop = bird.y - 22;
		var birdBottom = bird.y + 22;
		var pipeLeft = pipe.x - 60;
		var pipeRight = pipe.x + 60;
		if (birdRight > pipeLeft && birdLeft < pipeRight) {
			// Bird is within pipe's horizontal bounds
			var topPipeBottom = pipe.topPipe.y;
			var bottomPipeTop = pipe.bottomPipe.y;
			if (birdTop < topPipeBottom || birdBottom > bottomPipeTop) {
				return true;
			}
		}
		// Check if bird touches pipe - immediate death with resize effect
		if (bird.intersects(pipe.topPipe) || bird.intersects(pipe.bottomPipe)) {
			// Resize pipe with tween effect
			tween(pipe.topPipe, {
				scaleX: 1.2,
				scaleY: 1.2
			}, {
				duration: 200
			});
			tween(pipe.bottomPipe, {
				scaleX: 1.2,
				scaleY: 1.2
			}, {
				duration: 200
			});
			return true;
		}
	}
	return false;
}
function updateScore() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		if (!pipe.scored && bird.x > pipe.x + 60) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	}
}
function cleanupPipes() {
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
}
// Input handling
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
	} else if (!gameOver) {
		bird.flap();
	}
};
// Main game loop
game.update = function () {
	if (!gameStarted || gameOver) {
		return;
	}
	// Update bird
	bird.update();
	// Spawn pipes
	pipeSpawnTimer++;
	var currentDelay = pipes.length === 0 ? initialPipeSpawnDelay : pipeSpawnDelay;
	if (pipeSpawnTimer >= currentDelay) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Update pipes
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].update();
	}
	// Update ground tiles - scroll ground
	for (var g = 0; g < groundTiles.length; g++) {
		groundTiles[g].x -= 2; // Move ground at half pipe speed
		// Reset ground position when it goes off screen
		if (groundTiles[g].x <= -291) {
			groundTiles[g].x = (groundTiles.length - 1) * 291;
		}
	}
	// Check collisions
	if (checkCollisions()) {
		gameOver = true;
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
	// Update score
	updateScore();
	// Cleanup off-screen pipes
	cleanupPipes();
};

===================================================================
--- original.js
+++ change.js
@@ -87,9 +87,9 @@
 var ground;
 var gameStarted = false;
 var gameOver = false;
 var pipeSpawnTimer = 0;
-var pipeSpawnDelay = 200; // frames between pipe spawns
+var pipeSpawnDelay = 150; // frames between pipe spawns
 var initialPipeSpawnDelay = 60; // frames until first pipe spawns
 // UI elements
 var scoreTxt = new Text2('0', {
 	size: 80,
@@ -108,15 +108,20 @@
 // Create bird
 bird = game.addChild(new Bird());
 bird.x = 400;
 bird.y = 2732 / 2;
-// Create ground
-ground = game.addChild(LK.getAsset('ground', {
-	anchorX: 0,
-	anchorY: 1
-}));
-ground.x = 0;
-ground.y = 2732;
+// Create ground - duplicated side by side for continuous ground
+var groundTiles = [];
+for (var i = 0; i < 3; i++) {
+	var groundTile = game.addChild(LK.getAsset('ground', {
+		anchorX: 0,
+		anchorY: 1
+	}));
+	groundTile.x = i * 291; // Position tiles side by side based on ground width
+	groundTile.y = 2732;
+	groundTiles.push(groundTile);
+}
+ground = groundTiles[0]; // Keep reference to first tile for backward compatibility
 function startGame() {
 	gameStarted = true;
 	instructionTxt.visible = false;
 	bird.flap();
@@ -131,11 +136,13 @@
 	pipes.push(pipe);
 	game.addChild(pipe);
 }
 function checkCollisions() {
-	// Check ground collision
-	if (bird.y + 30 >= ground.y) {
-		return true;
+	// Check ground collision - check against all ground tiles
+	for (var g = 0; g < groundTiles.length; g++) {
+		if (bird.y + 30 >= groundTiles[g].y) {
+			return true;
+		}
 	}
 	// Check ceiling collision
 	if (bird.y - 30 <= 0) {
 		return true;
@@ -223,8 +230,16 @@
 	// Update pipes
 	for (var i = 0; i < pipes.length; i++) {
 		pipes[i].update();
 	}
+	// Update ground tiles - scroll ground
+	for (var g = 0; g < groundTiles.length; g++) {
+		groundTiles[g].x -= 2; // Move ground at half pipe speed
+		// Reset ground position when it goes off screen
+		if (groundTiles[g].x <= -291) {
+			groundTiles[g].x = (groundTiles.length - 1) * 291;
+		}
+	}
 	// Check collisions
 	if (checkCollisions()) {
 		gameOver = true;
 		LK.getSound('hit').play();