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

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var FallingObject = Container.expand(function (type) {
	var self = Container.call(this);
	var objectGraphics = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = (Math.random() * 3 + 2) * 2;
	self.type = type;
	self.update = function () {
		self.y += self.speed;
		self.rotation += 0.05;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.shootCooldown = 0;
	self.update = function () {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 200;
var bullets = [];
var fallingObjects = [];
var lives = 3;
var objectTypes = ['knife', 'sword', 'bat', 'stick'];
var spawnTimer = 0;
var spawnRate = 60;
var difficultyTimer = 0;
var maxBullets = 3;
// Timer challenge variables
var challengeTimer = 0;
var challengeDuration = 900; // 15 seconds at 60 FPS
var objectsDestroyed = 0;
var challengeTarget = 5;
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
scoreText.x = 150;
scoreText.y = 50;
LK.gui.topLeft.addChild(scoreText);
var livesText = new Text2('Lives: 3', {
	size: 60,
	fill: 0xFF4444
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
var timerText = new Text2('Time: 15s | Target: 5', {
	size: 50,
	fill: 0xFFFF00
});
timerText.anchor.set(0.5, 0);
timerText.x = 0;
timerText.y = 50;
LK.gui.top.addChild(timerText);
var dragActive = false;
var lastTouchX = 0;
var lastTouchY = 0;
function updateScore() {
	scoreText.setText('Score: ' + LK.getScore());
}
function updateLives() {
	livesText.setText('Lives: ' + lives);
}
function updateTimer() {
	var timeLeft = Math.ceil((challengeDuration - challengeTimer) / 60);
	var remaining = Math.max(0, challengeTarget - objectsDestroyed);
	timerText.setText('Time: ' + timeLeft + 's | Need: ' + remaining);
}
function spawnFallingObject() {
	var type = objectTypes[Math.floor(Math.random() * objectTypes.length)];
	var obj = new FallingObject(type);
	obj.x = Math.random() * (2048 - 100) + 50;
	obj.y = -50;
	fallingObjects.push(obj);
	game.addChild(obj);
}
function shootBullet() {
	if (player.shootCooldown <= 0 && bullets.length < maxBullets) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y - 40;
		bullets.push(bullet);
		game.addChild(bullet);
		player.shootCooldown = 15;
		LK.getSound('shoot').play();
	}
}
function handleChallengeEnd() {
	if (objectsDestroyed >= challengeTarget) {
		// Challenge completed successfully
		challengeTimer = 0;
		objectsDestroyed = 0;
	} else {
		// Challenge failed - apply penalty
		var currentScore = LK.getScore();
		if (currentScore < 20) {
			// Game over if score would go below 0
			LK.showGameOver();
			return;
		} else {
			// Subtract 20 points
			LK.setScore(currentScore - 20);
			updateScore();
			challengeTimer = 0;
			objectsDestroyed = 0;
		}
	}
	updateTimer();
}
game.down = function (x, y, obj) {
	dragActive = true;
	lastTouchX = x;
	lastTouchY = y;
	shootBullet();
};
game.move = function (x, y, obj) {
	if (dragActive) {
		var deltaX = x - lastTouchX;
		var deltaY = y - lastTouchY;
		player.x += deltaX;
		player.y += deltaY;
		// Keep player within screen bounds
		if (player.x < 40) player.x = 40;
		if (player.x > 2048 - 40) player.x = 2048 - 40;
		if (player.y < 40) player.y = 40;
		if (player.y > 2732 - 40) player.y = 2732 - 40;
		lastTouchX = x;
		lastTouchY = y;
	}
};
game.up = function (x, y, obj) {
	dragActive = false;
};
game.update = function () {
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer % 400 === 0 && spawnRate > 20) {
		spawnRate -= 3;
	}
	// Spawn falling objects with random timing
	spawnTimer++;
	var randomSpawnDelay = spawnRate + Math.floor(Math.random() * 30) - 15;
	if (spawnTimer >= randomSpawnDelay) {
		spawnFallingObject();
		spawnTimer = 0;
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove bullets that go off screen
		if (bullet.lastY >= -50 && bullet.y < -50) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet collision with falling objects
		for (var j = fallingObjects.length - 1; j >= 0; j--) {
			var obj = fallingObjects[j];
			if (bullet.intersects(obj)) {
				// Destroy both bullet and object
				LK.setScore(LK.getScore() + 1);
				objectsDestroyed++;
				updateScore();
				updateTimer();
				LK.getSound('destroy').play();
				// Check if challenge is completed
				if (objectsDestroyed >= challengeTarget) {
					challengeTimer = 0;
					objectsDestroyed = 0;
					updateTimer();
				}
				bullet.destroy();
				bullets.splice(i, 1);
				obj.destroy();
				fallingObjects.splice(j, 1);
				break;
			}
		}
		if (bullets[i]) {
			bullet.lastY = bullet.y;
		}
	}
	// Update falling objects
	for (var k = fallingObjects.length - 1; k >= 0; k--) {
		var fallingObj = fallingObjects[k];
		if (fallingObj.lastY === undefined) fallingObj.lastY = fallingObj.y;
		// Remove objects that fall off screen
		if (fallingObj.lastY <= 2732 + 50 && fallingObj.y > 2732 + 50) {
			fallingObj.destroy();
			fallingObjects.splice(k, 1);
			continue;
		}
		// Check collision with player
		if (fallingObj.intersects(player)) {
			lives--;
			updateLives();
			LK.getSound('hit').play();
			// Flash player red
			tween(player, {
				tint: 0xff0000
			}, {
				duration: 200,
				onFinish: function onFinish() {
					tween(player, {
						tint: 0xffffff
					}, {
						duration: 200
					});
				}
			});
			fallingObj.destroy();
			fallingObjects.splice(k, 1);
			if (lives <= 0) {
				LK.showGameOver();
				return;
			}
			continue;
		}
		fallingObj.lastY = fallingObj.y;
	}
	// Update challenge timer
	challengeTimer++;
	updateTimer();
	if (challengeTimer >= challengeDuration) {
		handleChallengeEnd();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -70,9 +70,9 @@
 var difficultyTimer = 0;
 var maxBullets = 3;
 // Timer challenge variables
 var challengeTimer = 0;
-var challengeDuration = 600; // 10 seconds at 60 FPS
+var challengeDuration = 900; // 15 seconds at 60 FPS
 var objectsDestroyed = 0;
 var challengeTarget = 5;
 // UI Elements
 var scoreText = new Text2('Score: 0', {
@@ -88,9 +88,9 @@
 	fill: 0xFF4444
 });
 livesText.anchor.set(1, 0);
 LK.gui.topRight.addChild(livesText);
-var timerText = new Text2('Time: 10s | Target: 5', {
+var timerText = new Text2('Time: 15s | Target: 5', {
 	size: 50,
 	fill: 0xFFFF00
 });
 timerText.anchor.set(0.5, 0);