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

/**** 
* Classes
****/ 
var FastZombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('fastZombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 1;
	self.maxHealth = 1;
	self.speed = 3;
	self.points = 15;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		if (player) {
			self.lastX = self.x;
			self.lastY = self.y;
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Chase player
				self.x += dx / distance * self.speed * zombieSpeedMultiplier;
				self.y += dy / distance * self.speed * zombieSpeedMultiplier;
			}
		}
	};
	return self;
});
var Menu = Container.expand(function () {
	var self = Container.call(this);
	self.interactive = true;
	var playButton = self.attachAsset('menuButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -100,
		scaleX: 1.5,
		scaleY: 1.5
	});
	var playText = new Text2('PLAY', {
		size: 60,
		fill: 0xFFFFFF
	});
	playText.anchor.set(0.5, 0.5);
	playText.y = -100;
	self.addChild(playText);
	var settingsButton = self.attachAsset('settingButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: 50,
		scaleX: 1.8,
		scaleY: 1.8
	});
	var settingsText = new Text2('SETTINGS', {
		size: 40,
		fill: 0xFFFFFF
	});
	settingsText.anchor.set(0.5, 0.5);
	settingsText.y = 50;
	self.addChild(settingsText);
	self.down = function (x, y, obj) {
		// Use the x,y parameters directly instead of obj.parent.toGlobal
		var localPos = self.toLocal({
			x: x,
			y: y
		});
		if (localPos.y > -175 && localPos.y < -25) {
			LK.getSound('menuClick').play();
			startGame();
		} else if (localPos.y > -22 && localPos.y < 122) {
			LK.getSound('menuClick').play();
			showSettings();
		}
	};
	return self;
});
var Particle = Container.expand(function () {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.vx = 0;
	self.vy = 0;
	self.life = 60;
	self.maxLife = 60;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
		self.life--;
		self.alpha = self.life / self.maxLife;
		if (self.life <= 0) {
			self.destroy();
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.lastCollidedZombies = [];
	return self;
});
var SettingsMenu = Container.expand(function () {
	var self = Container.call(this);
	self.interactive = true;
	var titleText = new Text2('SETTINGS', {
		size: 80,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.y = -300;
	self.addChild(titleText);
	var musicVolumeText = new Text2('Music Volume: ' + Math.round(musicVolume * 100) + '%', {
		size: 50,
		fill: 0xFFFFFF
	});
	musicVolumeText.anchor.set(0.5, 0.5);
	musicVolumeText.y = -200;
	self.addChild(musicVolumeText);
	var volumeUpButton = self.attachAsset('settingButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -200,
		y: -150,
		scaleX: 1.4,
		scaleY: 1.4
	});
	var volumeUpText = new Text2('+', {
		size: 60,
		fill: 0xFFFFFF
	});
	volumeUpText.anchor.set(0.5, 0.5);
	volumeUpText.x = -200;
	volumeUpText.y = -150;
	self.addChild(volumeUpText);
	var volumeDownButton = self.attachAsset('settingButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 200,
		y: -150,
		scaleX: 1.4,
		scaleY: 1.4
	});
	var volumeDownText = new Text2('-', {
		size: 60,
		fill: 0xFFFFFF
	});
	volumeDownText.anchor.set(0.5, 0.5);
	volumeDownText.x = 200;
	volumeDownText.y = -150;
	self.addChild(volumeDownText);
	var zombieSpeedText = new Text2('Zombie Speed: ' + zombieSpeedMultiplier, {
		size: 50,
		fill: 0xFFFFFF
	});
	zombieSpeedText.anchor.set(0.5, 0.5);
	zombieSpeedText.y = -50;
	self.addChild(zombieSpeedText);
	var speedUpButton = self.attachAsset('settingButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -200,
		y: 0,
		scaleX: 1.4,
		scaleY: 1.4
	});
	var speedUpText = new Text2('+', {
		size: 60,
		fill: 0xFFFFFF
	});
	speedUpText.anchor.set(0.5, 0.5);
	speedUpText.x = -200;
	speedUpText.y = 0;
	self.addChild(speedUpText);
	var speedDownButton = self.attachAsset('settingButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 200,
		y: 0,
		scaleX: 1.4,
		scaleY: 1.4
	});
	var speedDownText = new Text2('-', {
		size: 60,
		fill: 0xFFFFFF
	});
	speedDownText.anchor.set(0.5, 0.5);
	speedDownText.x = 200;
	speedDownText.y = 0;
	self.addChild(speedDownText);
	var backButton = self.attachAsset('menuButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: 200,
		scaleX: 1.5,
		scaleY: 1.5
	});
	var backText = new Text2('BACK', {
		size: 60,
		fill: 0xFFFFFF
	});
	backText.anchor.set(0.5, 0.5);
	backText.y = 200;
	self.addChild(backText);
	self.down = function (x, y, obj) {
		// Use the x,y parameters directly instead of obj.parent.toGlobal
		var localPos = self.toLocal({
			x: x,
			y: y
		});
		if (localPos.x > -410 && localPos.x < 10 && localPos.y > -206 && localPos.y < -94) {
			// Volume up
			musicVolume = Math.min(1, musicVolume + 0.1);
			musicVolumeText.setText('Music Volume: ' + Math.round(musicVolume * 100) + '%');
			storage.musicVolume = musicVolume;
			LK.getSound('menuClick').play();
		} else if (localPos.x > -10 && localPos.x < 410 && localPos.y > -206 && localPos.y < -94) {
			// Volume down
			musicVolume = Math.max(0, musicVolume - 0.1);
			musicVolumeText.setText('Music Volume: ' + Math.round(musicVolume * 100) + '%');
			storage.musicVolume = musicVolume;
			LK.getSound('menuClick').play();
		} else if (localPos.x > -410 && localPos.x < 10 && localPos.y > -56 && localPos.y < 56) {
			// Speed up
			zombieSpeedMultiplier = Math.min(3, zombieSpeedMultiplier + 0.2);
			zombieSpeedText.setText('Zombie Speed: ' + zombieSpeedMultiplier.toFixed(1));
			LK.getSound('menuClick').play();
		} else if (localPos.x > -10 && localPos.x < 410 && localPos.y > -56 && localPos.y < 56) {
			// Speed down
			zombieSpeedMultiplier = Math.max(0.2, zombieSpeedMultiplier - 0.2);
			zombieSpeedText.setText('Zombie Speed: ' + zombieSpeedMultiplier.toFixed(1));
			LK.getSound('menuClick').play();
		} else if (localPos.y > 125 && localPos.y < 275) {
			// Back
			LK.getSound('menuClick').play();
			showMenu();
		}
	};
	return self;
});
var TankZombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('tankZombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 3;
	self.maxHealth = 3;
	self.speed = 1;
	self.points = 25;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		if (player) {
			self.lastX = self.x;
			self.lastY = self.y;
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Chase player
				self.x += dx / distance * self.speed * zombieSpeedMultiplier;
				self.y += dy / distance * self.speed * zombieSpeedMultiplier;
			}
		}
	};
	return self;
});
var TrailParticle = Container.expand(function () {
	var self = Container.call(this);
	var trailGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.life = 30;
	self.maxLife = 30;
	self.update = function () {
		self.life--;
		self.alpha = self.life / self.maxLife;
		self.scaleX = self.alpha * trailSize;
		self.scaleY = self.alpha * trailSize;
		if (self.life <= 0) {
			self.destroy();
		}
	};
	return self;
});
var Zombie = Container.expand(function () {
	var self = Container.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 1;
	self.maxHealth = 1;
	self.speed = 1.5;
	self.points = 10;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		if (player) {
			self.lastX = self.x;
			self.lastY = self.y;
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Chase player
				self.x += dx / distance * self.speed * zombieSpeedMultiplier;
				self.y += dy / distance * self.speed * zombieSpeedMultiplier;
			}
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2F4F2F
});

/**** 
* Game Code
****/ 
// Game state variables
var gameState = 'playing'; // Always playing now
var particles = [];
var zombieSpeedMultiplier = 1.0;
var musicVolume = storage.musicVolume || 1.0;
// Game variables
var player;
var zombies = [];
var trailParticles = [];
var playerLastX = 0;
var playerLastY = 0;
var trailTimer = 0;
var currentWave = 1;
var zombiesSpawned = 0;
var zombiesKilled = 0;
var gameTime = 0;
var waveTime = 0;
var spawnTimer = 0;
var dragNode = null;
var killStreak = 0;
var killStreakTimer = 0;
var combo = 0;
var comboTimer = 0;
var maxCombo = 0;
var trailSize = 1.5; // Make trail bigger
// Wave configuration
var waveConfigs = [{
	zombieCount: 8,
	spawnDelay: 90,
	zombieTypes: ['zombie']
}, {
	zombieCount: 12,
	spawnDelay: 75,
	zombieTypes: ['zombie', 'fastZombie']
}, {
	zombieCount: 16,
	spawnDelay: 60,
	zombieTypes: ['zombie', 'fastZombie']
}, {
	zombieCount: 20,
	spawnDelay: 50,
	zombieTypes: ['zombie', 'fastZombie', 'tankZombie']
}, {
	zombieCount: 25,
	spawnDelay: 45,
	zombieTypes: ['zombie', 'fastZombie', 'tankZombie']
}, {
	zombieCount: 30,
	spawnDelay: 40,
	zombieTypes: ['zombie', 'fastZombie', 'tankZombie']
}, {
	zombieCount: 35,
	spawnDelay: 35,
	zombieTypes: ['zombie', 'fastZombie', 'tankZombie']
}, {
	zombieCount: 40,
	spawnDelay: 30,
	zombieTypes: ['zombie', 'fastZombie', 'tankZombie']
}];
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
scoreText.x = 120;
scoreText.y = 20;
LK.gui.topLeft.addChild(scoreText);
var waveText = new Text2('Wave: 1', {
	size: 60,
	fill: 0xFFFFFF
});
waveText.anchor.set(0.5, 0);
LK.gui.top.addChild(waveText);
var timerText = new Text2('Time: 90', {
	size: 60,
	fill: 0xFFFFFF
});
timerText.anchor.set(1, 0);
timerText.x = -20;
timerText.y = 20;
LK.gui.topRight.addChild(timerText);
var instructionText = new Text2('Tap the cubes to get points', {
	size: 50,
	fill: 0xFFFFFF
});
instructionText.anchor.set(0.5, 1);
instructionText.y = -20;
LK.gui.bottom.addChild(instructionText);
var comboText = new Text2('Combo: 0', {
	size: 60,
	fill: 0xFFD700
});
comboText.anchor.set(1, 0);
comboText.x = -20;
comboText.y = 100;
LK.gui.topRight.addChild(comboText);
// Initialize game function
function initializeGame() {
	// Initialize player
	if (!player) {
		player = game.addChild(new Player());
		player.x = 1024;
		player.y = 1366;
		playerLastX = player.x;
		playerLastY = player.y;
	}
	// Start background music
	LK.playMusic('backgroundMusic', {
		loop: true,
		volume: musicVolume
	});
}
function createParticles(x, y, count, color) {
	for (var i = 0; i < count; i++) {
		var particle = new Particle();
		particle.x = x;
		particle.y = y;
		particle.vx = (Math.random() - 0.5) * 10;
		particle.vy = (Math.random() - 0.5) * 10;
		if (color) {
			tween(particle, {
				tint: color
			}, {
				duration: 0
			});
		}
		particles.push(particle);
		game.addChild(particle);
	}
}
// Create volume slider at bottom left
var volumeSliderBg = LK.getAsset('settingButton', {
	anchorX: 0,
	anchorY: 1,
	x: 20,
	y: 0,
	scaleX: 0.5,
	scaleY: 2
});
LK.gui.bottomLeft.addChild(volumeSliderBg);
var volumeSliderHandle = LK.getAsset('player', {
	anchorX: 0.5,
	anchorY: 0.5,
	scaleX: 0.6,
	scaleY: 0.6
});
volumeSliderBg.addChild(volumeSliderHandle);
var volumeText = new Text2(Math.round(musicVolume * 100) + '%', {
	size: 30,
	fill: 0xFFFFFF
});
volumeText.anchor.set(0.5, 0.5);
volumeText.x = 75;
volumeText.y = 0;
volumeSliderBg.addChild(volumeText);
// Position handle based on volume (0 = bottom, 1 = top)
volumeSliderHandle.x = 75;
volumeSliderHandle.y = -20 - musicVolume * 120;
// Make slider interactive
volumeSliderBg.interactive = true;
volumeSliderBg.down = function (x, y, obj) {
	var localPos = volumeSliderBg.toLocal({
		x: x,
		y: y
	});
	// Calculate volume based on Y position (inverted since 0,0 is top-left)
	var newVolume = Math.max(0, Math.min(1, (-localPos.y + 20) / 120));
	musicVolume = newVolume;
	storage.musicVolume = musicVolume;
	// Update handle position
	tween(volumeSliderHandle, {
		y: -20 - musicVolume * 120
	}, {
		duration: 200
	});
	volumeText.setText(Math.round(musicVolume * 100) + '%');
	LK.getSound('menuClick').play();
};
// Start game after 2 seconds
LK.setTimeout(function () {
	initializeGame();
}, 2000);
// Spawn zombie function
function spawnZombie() {
	var config = waveConfigs[Math.min(currentWave - 1, waveConfigs.length - 1)];
	var zombieTypes = config.zombieTypes;
	var randomType = zombieTypes[Math.floor(Math.random() * zombieTypes.length)];
	var zombie;
	if (randomType === 'fastZombie') {
		zombie = new FastZombie();
	} else if (randomType === 'tankZombie') {
		zombie = new TankZombie();
	} else {
		zombie = new Zombie();
	}
	// Apply speed multiplier
	zombie.speed *= zombieSpeedMultiplier;
	// Spawn from random edge
	var edge = Math.floor(Math.random() * 4);
	if (edge === 0) {
		// Top
		zombie.x = Math.random() * 2048;
		zombie.y = -30;
	} else if (edge === 1) {
		// Right
		zombie.x = 2078;
		zombie.y = Math.random() * 2732;
	} else if (edge === 2) {
		// Bottom
		zombie.x = Math.random() * 2048;
		zombie.y = 2762;
	} else {
		// Left
		zombie.x = -30;
		zombie.y = Math.random() * 2732;
	}
	zombie.lastX = zombie.x;
	zombie.lastY = zombie.y;
	// Create spawn particles
	createParticles(zombie.x, zombie.y, 6, 0x8b4513);
	zombies.push(zombie);
	game.addChild(zombie);
	zombiesSpawned++;
}
// Update UI function
function updateUI() {
	scoreText.setText('Score: ' + LK.getScore());
	waveText.setText('Wave: ' + currentWave);
	timerText.setText('Time: ' + Math.max(0, Math.ceil((150 * 60 - gameTime) / 60)));
	comboText.setText('Combo: ' + combo + (maxCombo > 0 ? ' (Best: ' + maxCombo + ')' : ''));
}
// Handle move events
function handleMove(x, y, obj) {
	if (dragNode) {
		// Keep target position within bounds
		var targetX = Math.max(40, Math.min(2008, x));
		var targetY = Math.max(40, Math.min(2692, y));
		// Stop any existing movement tween
		tween.stop(dragNode, {
			x: true,
			y: true
		});
		// Smoothly move to target position
		tween(dragNode, {
			x: targetX,
			y: targetY
		}, {
			duration: 300,
			easing: tween.easeOut
		});
	}
}
// Game event handlers
game.move = handleMove;
game.down = function (x, y, obj) {
	if (player) {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game update loop
game.update = function () {
	// Update particles
	for (var p = particles.length - 1; p >= 0; p--) {
		var particle = particles[p];
		if (particle.life <= 0) {
			particles.splice(p, 1);
		}
	}
	// Update trail particles
	for (var t = trailParticles.length - 1; t >= 0; t--) {
		var trailParticle = trailParticles[t];
		if (trailParticle.life <= 0) {
			trailParticles.splice(t, 1);
		}
	}
	// Create player trail when moving
	if (player) {
		var playerMoved = Math.abs(player.x - playerLastX) > 5 || Math.abs(player.y - playerLastY) > 5;
		if (playerMoved) {
			trailTimer++;
			if (trailTimer >= 3) {
				// Create trail every 3 frames when moving
				var trail = new TrailParticle();
				trail.x = playerLastX;
				trail.y = playerLastY;
				tween(trail, {
					tint: 0x4caf50
				}, {
					duration: 0
				});
				trailParticles.push(trail);
				game.addChild(trail);
				trailTimer = 0;
			}
		}
		playerLastX = player.x;
		playerLastY = player.y;
	}
	// Only run game logic when player exists
	if (!player) {
		return;
	}
	gameTime++;
	waveTime++;
	// Update kill streak timer
	if (killStreakTimer > 0) {
		killStreakTimer--;
		if (killStreakTimer <= 0) {
			killStreak = 0;
		}
	}
	// Update combo timer
	if (comboTimer > 0) {
		comboTimer--;
		if (comboTimer <= 0) {
			combo = 0;
		}
	}
	// Wave management
	var config = waveConfigs[Math.min(currentWave - 1, waveConfigs.length - 1)];
	// Spawn zombies
	if (zombiesSpawned < config.zombieCount) {
		spawnTimer++;
		if (spawnTimer >= config.spawnDelay) {
			spawnZombie();
			spawnTimer = 0;
		}
	}
	// Check wave completion
	if (zombiesSpawned >= config.zombieCount && zombies.length === 0) {
		currentWave++;
		zombiesSpawned = 0;
		waveTime = 0;
		// Bonus points for wave completion
		LK.setScore(LK.getScore() + currentWave * 50);
		LK.getSound('waveStart').play();
		// Restore some health
		player.health = Math.min(player.maxHealth, player.health + 20);
		// Create celebration particles
		createParticles(player.x, player.y, 15, 0x00ff00);
	}
	// Update zombies and check player collision for combat
	for (var k = zombies.length - 1; k >= 0; k--) {
		var zombie = zombies[k];
		// Initialize collision tracking if not exists
		if (zombie.lastCollidingWithPlayer === undefined) {
			zombie.lastCollidingWithPlayer = false;
		}
		// Check current collision state
		var currentlyColliding = zombie.intersects(player);
		// If collision just started (transition from false to true)
		if (!zombie.lastCollidingWithPlayer && currentlyColliding) {
			// Player kills zombie by running into it
			zombie.health--;
			// Flash zombie when hit
			LK.effects.flashObject(zombie, 0xff0000, 200);
			LK.getSound('playerAttack').play();
			// Create hit particles
			createParticles(zombie.x, zombie.y, 8, 0xff0000);
			if (zombie.health <= 0) {
				// Update combo system
				combo++;
				comboTimer = 120; // 2 seconds to maintain combo
				if (combo > maxCombo) {
					maxCombo = combo;
				}
				// Add score with kill streak and combo multiplier
				var basePoints = zombie.points;
				var killStreakMultiplier = 1 + killStreak * 0.1;
				var comboMultiplier = 1 + Math.min(combo - 1, 10) * 0.2; // Max 3x from combo
				var points = basePoints * killStreakMultiplier * comboMultiplier;
				LK.setScore(LK.getScore() + Math.floor(points));
				killStreak++;
				killStreakTimer = 180; // 3 seconds
				// Flash combo text when combo increases
				if (combo > 1) {
					tween(comboText, {
						tint: 0xFFFFFF
					}, {
						duration: 100,
						onFinish: function onFinish() {
							tween(comboText, {
								tint: 0xFFD700
							}, {
								duration: 100
							});
						}
					});
				}
				// Create death particles
				createParticles(zombie.x, zombie.y, 12, 0xffff00);
				LK.getSound('zombieDeath').play();
				zombie.destroy();
				zombies.splice(k, 1);
				zombiesKilled++;
			} else {
				// If zombie survives, player takes damage
				player.health -= 5;
				LK.effects.flashScreen(0xff0000, 300);
				LK.getSound('playerHurt').play();
				if (player.health <= 0) {
					LK.showGameOver();
					return;
				}
			}
		}
		// Update collision tracking
		zombie.lastCollidingWithPlayer = currentlyColliding;
	}
	// Check win condition (150 seconds = 9000 frames at 60fps)
	if (gameTime >= 9000) {
		LK.showYouWin();
		return;
	}
	// Update UI
	updateUI();
};

===================================================================
--- original.js
+++ change.js
@@ -293,10 +293,10 @@
 	self.maxLife = 30;
 	self.update = function () {
 		self.life--;
 		self.alpha = self.life / self.maxLife;
-		self.scaleX = self.alpha * 0.8;
-		self.scaleY = self.alpha * 0.8;
+		self.scaleX = self.alpha * trailSize;
+		self.scaleY = self.alpha * trailSize;
 		if (self.life <= 0) {
 			self.destroy();
 		}
 	};
@@ -361,8 +361,12 @@
 var spawnTimer = 0;
 var dragNode = null;
 var killStreak = 0;
 var killStreakTimer = 0;
+var combo = 0;
+var comboTimer = 0;
+var maxCombo = 0;
+var trailSize = 1.5; // Make trail bigger
 // Wave configuration
 var waveConfigs = [{
 	zombieCount: 8,
 	spawnDelay: 90,
@@ -418,15 +422,23 @@
 timerText.anchor.set(1, 0);
 timerText.x = -20;
 timerText.y = 20;
 LK.gui.topRight.addChild(timerText);
-var healthText = new Text2('Tap or swipe into the cubes for points', {
+var instructionText = new Text2('Tap the cubes to get points', {
 	size: 50,
 	fill: 0xFFFFFF
 });
-healthText.anchor.set(0.5, 1);
-healthText.y = -20;
-LK.gui.bottom.addChild(healthText);
+instructionText.anchor.set(0.5, 1);
+instructionText.y = -20;
+LK.gui.bottom.addChild(instructionText);
+var comboText = new Text2('Combo: 0', {
+	size: 60,
+	fill: 0xFFD700
+});
+comboText.anchor.set(1, 0);
+comboText.x = -20;
+comboText.y = 100;
+LK.gui.topRight.addChild(comboText);
 // Initialize game function
 function initializeGame() {
 	// Initialize player
 	if (!player) {
@@ -557,9 +569,10 @@
 // Update UI function
 function updateUI() {
 	scoreText.setText('Score: ' + LK.getScore());
 	waveText.setText('Wave: ' + currentWave);
-	timerText.setText('Time: ' + Math.max(0, Math.ceil((90 * 60 - gameTime) / 60)));
+	timerText.setText('Time: ' + Math.max(0, Math.ceil((150 * 60 - gameTime) / 60)));
+	comboText.setText('Combo: ' + combo + (maxCombo > 0 ? ' (Best: ' + maxCombo + ')' : ''));
 }
 // Handle move events
 function handleMove(x, y, obj) {
 	if (dragNode) {
@@ -643,8 +656,15 @@
 		if (killStreakTimer <= 0) {
 			killStreak = 0;
 		}
 	}
+	// Update combo timer
+	if (comboTimer > 0) {
+		comboTimer--;
+		if (comboTimer <= 0) {
+			combo = 0;
+		}
+	}
 	// Wave management
 	var config = waveConfigs[Math.min(currentWave - 1, waveConfigs.length - 1)];
 	// Spawn zombies
 	if (zombiesSpawned < config.zombieCount) {
@@ -685,13 +705,37 @@
 			LK.getSound('playerAttack').play();
 			// Create hit particles
 			createParticles(zombie.x, zombie.y, 8, 0xff0000);
 			if (zombie.health <= 0) {
-				// Add score with kill streak multiplier
-				var points = zombie.points * (1 + killStreak * 0.1);
+				// Update combo system
+				combo++;
+				comboTimer = 120; // 2 seconds to maintain combo
+				if (combo > maxCombo) {
+					maxCombo = combo;
+				}
+				// Add score with kill streak and combo multiplier
+				var basePoints = zombie.points;
+				var killStreakMultiplier = 1 + killStreak * 0.1;
+				var comboMultiplier = 1 + Math.min(combo - 1, 10) * 0.2; // Max 3x from combo
+				var points = basePoints * killStreakMultiplier * comboMultiplier;
 				LK.setScore(LK.getScore() + Math.floor(points));
 				killStreak++;
 				killStreakTimer = 180; // 3 seconds
+				// Flash combo text when combo increases
+				if (combo > 1) {
+					tween(comboText, {
+						tint: 0xFFFFFF
+					}, {
+						duration: 100,
+						onFinish: function onFinish() {
+							tween(comboText, {
+								tint: 0xFFD700
+							}, {
+								duration: 100
+							});
+						}
+					});
+				}
 				// Create death particles
 				createParticles(zombie.x, zombie.y, 12, 0xffff00);
 				LK.getSound('zombieDeath').play();
 				zombie.destroy();
@@ -710,10 +754,10 @@
 		}
 		// Update collision tracking
 		zombie.lastCollidingWithPlayer = currentlyColliding;
 	}
-	// Check win condition (90 seconds = 5400 frames at 60fps)
-	if (gameTime >= 5400) {
+	// Check win condition (150 seconds = 9000 frames at 60fps)
+	if (gameTime >= 9000) {
 		LK.showYouWin();
 		return;
 	}
 	// Update UI