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

/**** 
* Classes
****/ 
var AmmoBox = Container.expand(function () {
	var self = Container.call(this);
	var ammoGraphics = self.attachAsset('ammoBox', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.ammoAmount = 15;
	self.lifetime = 600; // 10 seconds at 60fps
	self.update = function () {
		self.lifetime--;
		// Pulsing effect
		ammoGraphics.alpha = 0.7 + Math.sin(self.lifetime * 0.2) * 0.3;
		if (self.lifetime <= 0) {
			return true; // Should be removed
		}
		return false;
	};
	return self;
});
var Bazooka = Container.expand(function () {
	var self = Container.call(this);
	var bazookaGraphics = self.attachAsset('bazooka', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.ammo = 5;
	self.maxAmmo = 5;
	self.cooldown = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Reset bazooka usage flag 
		usingBazooka = false;
		// Always ready to fire pulsing effect
		bazookaGraphics.alpha = 0.8 + Math.sin(LK.ticks * 0.2) * 0.2;
	};
	self.down = function (x, y, obj) {
		self.fireBazooka();
	};
	self.fireBazooka = function () {
		// Get difficulty-based bazooka chances
		var bazookaChances = [{
			target: 0.85,
			blank: 0.12,
			explode: 0.03
		},
		// Easy: 85% target, 12% blank, 3% explode
		{
			target: 0.75,
			blank: 0.15,
			explode: 0.10
		},
		// Normal: 75% target, 15% blank, 10% explode
		{
			target: 0.65,
			blank: 0.20,
			explode: 0.15
		},
		// Hard: 65% target, 20% blank, 15% explode
		{
			target: 0.50,
			blank: 0.25,
			explode: 0.25
		} // Nightmare: 50% target, 25% blank, 25% explode
		];
		var chances = bazookaChances[selectedDifficulty - 1];
		// Random outcome based on difficulty
		var randomOutcome = Math.random();
		if (randomOutcome < chances.explode) {
			// 10% chance: Self-explosion and death
			// Create explosion at bazooka position
			var explosion = LK.getAsset('explosion', {
				anchorX: 0.5,
				anchorY: 0.5
			});
			explosion.x = self.x;
			explosion.y = self.y;
			explosion.alpha = 0.8;
			game.addChild(explosion);
			// Animate explosion
			tween(explosion, {
				alpha: 0,
				scaleX: 2,
				scaleY: 2
			}, {
				duration: 500,
				onFinish: function onFinish() {
					explosion.destroy();
				}
			});
			// Play explosion sound
			LK.getSound('explosion').play();
			// Kill player
			if (player) {
				player.takeDamage(player.health); // Deal enough damage to kill
			}
			// Flash effect
			LK.effects.flashObject(self, 0xff0000, 300);
			// Set bazooka usage flag
			usingBazooka = true;
			return;
		} else if (randomOutcome < chances.explode + chances.blank) {
			// 15% chance: Blank ammo (do nothing)
			// Play a different sound or visual effect for blank
			LK.getSound('bazookaShoot').play();
			// Flash effect with different color
			LK.effects.flashObject(self, 0x888888, 300);
			// Create blank ammo text
			var blankText = new Text2('blank ammo, try again', {
				size: 40,
				fill: 0xffffff
			});
			blankText.anchor.set(0.5, 0.5);
			blankText.x = self.x;
			blankText.y = self.y - 60;
			game.addChild(blankText);
			// Fade out blank text after 2 seconds
			tween(blankText, {
				alpha: 0
			}, {
				duration: 2000,
				onFinish: function onFinish() {
					blankText.destroy();
				}
			});
			// Set bazooka usage flag
			usingBazooka = true;
			return;
		}
		// 75% chance: Normal behavior - target enemy
		// Find nearest enemy to target
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - self.x;
			var dy = enemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				nearestEnemy = enemy;
			}
		}
		// Target boss if no enemies or boss is closer
		if (boss) {
			var dx = boss.x - self.x;
			var dy = boss.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (!nearestEnemy || distance < nearestDistance) {
				nearestEnemy = boss;
				nearestDistance = distance;
			}
		}
		if (nearestEnemy) {
			var bullet = new BazookaBullet();
			bullet.x = self.x;
			bullet.y = self.y;
			var dx = nearestEnemy.x - self.x;
			var dy = nearestEnemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				bullet.directionX = dx / distance;
				bullet.directionY = dy / distance;
			}
			bazookaBullets.push(bullet);
			game.addChild(bullet);
			// Play bazooka sound
			LK.getSound('bazookaShoot').play();
			// Flash effect
			LK.effects.flashObject(self, 0xff8800, 300);
			// Set bazooka usage flag
			usingBazooka = true;
		}
	};
	self.addAmmo = function (amount) {
		self.ammo = Math.min(self.maxAmmo, self.ammo + amount);
	};
	return self;
});
var BazookaBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bazookaBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.damage = 200;
	self.explosionRadius = 300;
	self.directionX = 0;
	self.directionY = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
		// Remove if out of bounds
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			return true; // Should be removed
		}
		return false;
	};
	self.explode = function () {
		// Create explosion visual effect
		var explosion = LK.getAsset('explosion', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		explosion.x = self.x;
		explosion.y = self.y;
		explosion.alpha = 0.8;
		game.addChild(explosion);
		// Animate explosion
		tween(explosion, {
			alpha: 0,
			scaleX: 2,
			scaleY: 2
		}, {
			duration: 500,
			onFinish: function onFinish() {
				explosion.destroy();
			}
		});
		// Play explosion sound
		LK.getSound('explosion').play();
		// Damage all enemies in radius
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - self.x;
			var dy = enemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance <= self.explosionRadius) {
				enemy.takeDamage(self.damage);
			}
		}
		// Damage boss if in radius
		if (boss) {
			var dx = boss.x - self.x;
			var dy = boss.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance <= self.explosionRadius) {
				boss.takeDamage(self.damage);
			}
		}
	};
	return self;
});
var Boss = Container.expand(function () {
	var self = Container.call(this);
	var bossGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3,
		scaleY: 3,
		tint: 0x800080
	});
	// Apply difficulty-based boss health values
	var difficultyBossHealth = [50000, 100000, 150000, 200000]; // Easy, Normal, Hard, Nightmare
	var bossHealth = difficultyBossHealth[selectedDifficulty - 1];
	self.health = bossHealth;
	self.maxHealth = bossHealth;
	self.speed = 4;
	self.damage = 50;
	self.attackCooldown = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.lastPlayerDistance = 1000;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
		// Find nearest NPC first, then player
		var targetEntity = null;
		var nearestDistance = Infinity;
		// Check NPCs first (priority targets)
		for (var k = 0; k < npcs.length; k++) {
			var npc = npcs[k];
			var dx = npc.x - self.x;
			var dy = npc.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				targetEntity = npc;
			}
		}
		// If no NPCs found or player is closer, target player
		if (player) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (!targetEntity || distance < nearestDistance) {
				nearestDistance = distance;
				targetEntity = player;
			}
		}
		// Move towards target entity
		if (targetEntity) {
			var dx = targetEntity.x - self.x;
			var dy = targetEntity.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				self.x += dx / distance * self.speed;
				self.y += dy / distance * self.speed;
			}
			// Attack if close enough
			var currentDistance = distance;
			if (currentDistance < 100 && self.attackCooldown <= 0) {
				targetEntity.takeDamage(self.damage);
				self.attackCooldown = 60;
			}
			self.lastPlayerDistance = currentDistance;
		}
	};
	self.takeDamage = function (amount) {
		self.health -= amount;
		LK.effects.flashObject(self, 0xffffff, 200);
		if (self.health <= 0) {
			return true; // Boss died
		}
		return false;
	};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 12;
	self.damage = 100; // Ensure one-hit kills
	self.directionX = 0;
	self.directionY = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
		// Remove if out of bounds
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			return true; // Should be removed
		}
		return false;
	};
	return self;
});
var DifficultySelectionScreen = Container.expand(function () {
	var self = Container.call(this);
	// Dark background
	var background = self.attachAsset('menuBackground', {
		x: 0,
		y: 0
	});
	// Blood moon effect in top right
	var moon = self.attachAsset('moonGlow', {
		x: 1600,
		y: 300,
		alpha: 0.7,
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Main title
	var titleText = new Text2('CHOOSE DIFFICULTY', {
		size: 80,
		fill: 0xFF4444,
		align: 'center'
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 600;
	self.addChild(titleText);
	// Easy
	var easyText = new Text2('EASY', {
		size: 60,
		fill: 0x00FF00,
		align: 'center'
	});
	easyText.anchor.set(0.5, 0.5);
	easyText.x = 1024;
	easyText.y = 900;
	self.addChild(easyText);
	var easyDesc = new Text2('Slower enemies, more resources', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	easyDesc.anchor.set(0.5, 0.5);
	easyDesc.x = 1024;
	easyDesc.y = 980;
	self.addChild(easyDesc);
	// Normal
	var normalText = new Text2('NORMAL', {
		size: 60,
		fill: 0xFFFF00,
		align: 'center'
	});
	normalText.anchor.set(0.5, 0.5);
	normalText.x = 1024;
	normalText.y = 1200;
	self.addChild(normalText);
	var normalDesc = new Text2('Balanced challenge', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	normalDesc.anchor.set(0.5, 0.5);
	normalDesc.x = 1024;
	normalDesc.y = 1280;
	self.addChild(normalDesc);
	// Hard
	var hardText = new Text2('HARD', {
		size: 60,
		fill: 0xFF8800,
		align: 'center'
	});
	hardText.anchor.set(0.5, 0.5);
	hardText.x = 1024;
	hardText.y = 1500;
	self.addChild(hardText);
	var hardDesc = new Text2('Faster enemies, less resources', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	hardDesc.anchor.set(0.5, 0.5);
	hardDesc.x = 1024;
	hardDesc.y = 1580;
	self.addChild(hardDesc);
	// Nightmare
	var nightmareText = new Text2('NIGHTMARE', {
		size: 60,
		fill: 0xFF0000,
		align: 'center'
	});
	nightmareText.anchor.set(0.5, 0.5);
	nightmareText.x = 1024;
	nightmareText.y = 1800;
	self.addChild(nightmareText);
	var nightmareDesc = new Text2('For the truly insane', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	nightmareDesc.anchor.set(0.5, 0.5);
	nightmareDesc.x = 1024;
	nightmareDesc.y = 1880;
	self.addChild(nightmareDesc);
	// Selection instruction
	var selectText = new Text2('TAP TO SELECT DIFFICULTY', {
		size: 40,
		fill: 0xFF6666,
		align: 'center'
	});
	selectText.anchor.set(0.5, 0.5);
	selectText.x = 1024;
	selectText.y = 2100;
	self.addChild(selectText);
	// Pulsing effect
	self.pulseTimer = 0;
	self.update = function () {
		self.pulseTimer += 0.1;
		selectText.alpha = 0.5 + Math.sin(self.pulseTimer) * 0.3;
		moon.alpha = 0.5 + Math.sin(self.pulseTimer * 0.5) * 0.2;
	};
	// Handle difficulty selection
	self.down = function (x, y, obj) {
		var selectedDifficulty = 2; // Default to normal
		if (y > 800 && y < 1100) {
			selectedDifficulty = 1; // Easy
		} else if (y > 1100 && y < 1400) {
			selectedDifficulty = 2; // Normal
		} else if (y > 1400 && y < 1700) {
			selectedDifficulty = 3; // Hard
		} else if (y > 1700 && y < 2000) {
			selectedDifficulty = 4; // Nightmare
		}
		self.destroy();
		startGameWithModeAndDifficulty(selectedGameMode, selectedDifficulty);
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 50; // Will be one-shot by 100 damage bullets
	self.speed = 8;
	self.damage = 20;
	self.attackCooldown = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.lastPlayerDistance = 1000;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
		// Find nearest NPC first, then player
		var targetEntity = null;
		var nearestDistance = Infinity;
		// Check NPCs first (priority targets)
		for (var k = 0; k < npcs.length; k++) {
			var npc = npcs[k];
			var dx = npc.x - self.x;
			var dy = npc.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				targetEntity = npc;
			}
		}
		// If no NPCs found or player is closer, target player
		if (player) {
			var dx = player.x - self.x;
			var dy = player.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (!targetEntity || distance < nearestDistance) {
				nearestDistance = distance;
				targetEntity = player;
			}
		}
		// Move towards target entity
		if (targetEntity) {
			var dx = targetEntity.x - self.x;
			var dy = targetEntity.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				self.x += dx / distance * self.speed;
				self.y += dy / distance * self.speed;
			}
			// Attack if close enough
			var currentDistance = distance;
			if (currentDistance < 50 && self.attackCooldown <= 0) {
				targetEntity.takeDamage(self.damage);
				self.attackCooldown = 60;
			}
			self.lastPlayerDistance = currentDistance;
		}
	};
	self.takeDamage = function (amount) {
		self.health -= amount;
		LK.effects.flashObject(self, 0xffffff, 200);
		if (self.health <= 0) {
			return true; // Enemy died
		}
		return false;
	};
	return self;
});
var HealthPack = Container.expand(function () {
	var self = Container.call(this);
	var healthGraphics = self.attachAsset('healthPack', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.healAmount = 30;
	self.lifetime = 600; // 10 seconds at 60fps
	self.update = function () {
		self.lifetime--;
		// Pulsing effect
		healthGraphics.alpha = 0.7 + Math.sin(self.lifetime * 0.2) * 0.3;
		if (self.lifetime <= 0) {
			return true; // Should be removed
		}
		return false;
	};
	return self;
});
var MenuScreen = Container.expand(function () {
	var self = Container.call(this);
	// Dark background
	var background = self.attachAsset('menuBackground', {
		x: 0,
		y: 0
	});
	// Blood moon effect in top right
	var moon = self.attachAsset('moonGlow', {
		x: 1600,
		y: 300,
		alpha: 0.7,
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Blood splatter decorations
	var splatter1 = self.attachAsset('bloodSplatter', {
		x: 200,
		y: 500,
		alpha: 0.6,
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.8,
		scaleY: 1.2
	});
	var splatter2 = self.attachAsset('bloodSplatter', {
		x: 1700,
		y: 1800,
		alpha: 0.4,
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.5,
		scaleY: 0.7
	});
	// Main title
	var titleText = new Text2('NIGHT OF THE\nMASSACRE 3', {
		size: 120,
		fill: 0xFF4444,
		align: 'center'
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 800;
	self.addChild(titleText);
	// Subtitle
	var subtitleText = new Text2('BLOOD MOON RISING', {
		size: 60,
		fill: 0xFFFFFF,
		align: 'center'
	});
	subtitleText.anchor.set(0.5, 0.5);
	subtitleText.x = 1024;
	subtitleText.y = 1000;
	self.addChild(subtitleText);
	// Start instruction
	var startText = new Text2('TAP ANYWHERE TO BEGIN', {
		size: 40,
		fill: 0xCCCCCC,
		align: 'center'
	});
	startText.anchor.set(0.5, 0.5);
	startText.x = 1024;
	startText.y = 1800;
	self.addChild(startText);
	// Pulsing effect for start text
	self.pulseTimer = 0;
	self.update = function () {
		self.pulseTimer += 0.1;
		startText.alpha = 0.5 + Math.sin(self.pulseTimer) * 0.3;
		// Subtle moon glow animation
		moon.alpha = 0.5 + Math.sin(self.pulseTimer * 0.5) * 0.2;
	};
	// Handle tap to start
	self.down = function (x, y, obj) {
		// Transition to game (this will be handled by destroying menu and starting game)
		self.destroy();
		startGame();
	};
	return self;
});
var ModeSelectionScreen = Container.expand(function () {
	var self = Container.call(this);
	// Dark background
	var background = self.attachAsset('menuBackground', {
		x: 0,
		y: 0
	});
	// Blood moon effect in top right
	var moon = self.attachAsset('moonGlow', {
		x: 1600,
		y: 300,
		alpha: 0.7,
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Main title
	var titleText = new Text2('CHOOSE YOUR NIGHTMARE', {
		size: 80,
		fill: 0xFF4444,
		align: 'center'
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 600;
	self.addChild(titleText);
	// Mode 1 - Classic Survival
	var mode1Text = new Text2('CLASSIC SURVIVAL', {
		size: 60,
		fill: 0xFFFFFF,
		align: 'center'
	});
	mode1Text.anchor.set(0.5, 0.5);
	mode1Text.x = 1024;
	mode1Text.y = 1000;
	self.addChild(mode1Text);
	var mode1Desc = new Text2('Survive until dawn with limited resources', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	mode1Desc.anchor.set(0.5, 0.5);
	mode1Desc.x = 1024;
	mode1Desc.y = 1080;
	self.addChild(mode1Desc);
	// Mode 2 - Endless Nightmare
	var mode2Text = new Text2('ENDLESS NIGHTMARE', {
		size: 60,
		fill: 0xFFFFFF,
		align: 'center'
	});
	mode2Text.anchor.set(0.5, 0.5);
	mode2Text.x = 1024;
	mode2Text.y = 1300;
	self.addChild(mode2Text);
	var mode2Desc = new Text2('Face endless waves of increasing horror', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	mode2Desc.anchor.set(0.5, 0.5);
	mode2Desc.x = 1024;
	mode2Desc.y = 1380;
	self.addChild(mode2Desc);
	// Mode 3 - Blood Eclipse
	var mode3Text = new Text2('BLOOD ECLIPSE', {
		size: 60,
		fill: 0xFFFFFF,
		align: 'center'
	});
	mode3Text.anchor.set(0.5, 0.5);
	mode3Text.x = 1024;
	mode3Text.y = 1600;
	self.addChild(mode3Text);
	var mode3Desc = new Text2('Ultimate challenge with eclipse phases', {
		size: 50,
		fill: 0xCCCCCC,
		align: 'center'
	});
	mode3Desc.anchor.set(0.5, 0.5);
	mode3Desc.x = 1024;
	mode3Desc.y = 1680;
	self.addChild(mode3Desc);
	// Back instruction
	var backText = new Text2('TAP TO SELECT MODE', {
		size: 40,
		fill: 0xFF6666,
		align: 'center'
	});
	backText.anchor.set(0.5, 0.5);
	backText.x = 1024;
	backText.y = 2000;
	self.addChild(backText);
	// Pulsing effect
	self.pulseTimer = 0;
	self.update = function () {
		self.pulseTimer += 0.1;
		backText.alpha = 0.5 + Math.sin(self.pulseTimer) * 0.3;
		moon.alpha = 0.5 + Math.sin(self.pulseTimer * 0.5) * 0.2;
	};
	// Handle mode selection
	self.down = function (x, y, obj) {
		selectedGameMode = 1;
		if (y > 1200 && y < 1400) {
			selectedGameMode = 2; // Endless Nightmare
		} else if (y > 1500 && y < 1700) {
			selectedGameMode = 3; // Blood Eclipse
		}
		self.destroy();
		showDifficultySelection();
	};
	return self;
});
var NPC = Container.expand(function () {
	var self = Container.call(this);
	var npcGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5,
		tint: 0x00ff00
	});
	// Apply difficulty-based health values
	var difficultyHealthValues = [120, 80, 60, 40]; // Easy, Normal, Hard, Nightmare
	var baseHealth = difficultyHealthValues[selectedDifficulty - 1];
	self.health = baseHealth;
	self.maxHealth = baseHealth;
	// Apply difficulty-based speed values - more difficult = slower NPCs
	var difficultySpeedValues = [8, 6, 4, 3]; // Easy, Normal, Hard, Nightmare
	self.speed = difficultySpeedValues[selectedDifficulty - 1];
	self.ammo = 20; // NPCs start with limited ammo
	self.maxAmmo = 25; // Maximum ammo NPCs can carry
	self.shootCooldown = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.lastPlayerDistance = 1000;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
		// Find nearest enemy to move towards
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - self.x;
			var dy = enemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				nearestEnemy = enemy;
			}
		}
		// Also consider boss
		if (boss) {
			var dx = boss.x - self.x;
			var dy = boss.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (!nearestEnemy || distance < nearestDistance) {
				nearestEnemy = boss;
				nearestDistance = distance;
			}
		}
		// Calculate repulsion force from other NPCs to maintain distance
		var repulsionX = 0;
		var repulsionY = 0;
		var minNPCDistance = 80; // Minimum distance to maintain from other NPCs
		for (var k = 0; k < npcs.length; k++) {
			var otherNPC = npcs[k];
			if (otherNPC !== self) {
				var dx = self.x - otherNPC.x;
				var dy = self.y - otherNPC.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				if (distance < minNPCDistance && distance > 0) {
					// Apply repulsion force (stronger when closer)
					var repulsionStrength = (minNPCDistance - distance) / minNPCDistance;
					repulsionX += dx / distance * repulsionStrength * 3;
					repulsionY += dy / distance * repulsionStrength * 3;
				}
			}
		}
		// Move towards nearest enemy
		if (nearestEnemy && nearestDistance > 100) {
			var dx = nearestEnemy.x - self.x;
			var dy = nearestEnemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Combine enemy attraction with NPC repulsion
				var moveX = dx / distance * self.speed + repulsionX;
				var moveY = dy / distance * self.speed + repulsionY;
				self.x += moveX;
				self.y += moveY;
			}
		} else if (repulsionX !== 0 || repulsionY !== 0) {
			// If no enemy target, just apply repulsion
			self.x += repulsionX;
			self.y += repulsionY;
		}
		// Keep NPC in bounds
		if (self.x < 40) self.x = 40;
		if (self.x > 2008) self.x = 2008;
		if (self.y < 40) self.y = 40;
		if (self.y > 2692) self.y = 2692;
		// Auto-shoot at enemies
		if (self.shootCooldown <= 0) {
			self.shootAtEnemies();
		}
	};
	self.shootAtEnemies = function () {
		// Difficulty-based shooting ranges
		var difficultyShootingRanges = [300, 400, 500, 600]; // Easy, Normal, Hard, Nightmare
		var shootingRange = difficultyShootingRanges[selectedDifficulty - 1];
		// Find nearest enemy
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - self.x;
			var dy = enemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance && distance < shootingRange) {
				// Only shoot at enemies within difficulty-based shooting range
				nearestDistance = distance;
				nearestEnemy = enemy;
			}
		}
		// Also consider boss
		if (boss) {
			var dx = boss.x - self.x;
			var dy = boss.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if ((!nearestEnemy || distance < nearestDistance) && distance < shootingRange) {
				nearestEnemy = boss;
				nearestDistance = distance;
			}
		}
		// Shoot at nearest enemy only if we have ammo
		if (nearestEnemy && self.ammo > 0) {
			var bullet = new NPCBullet();
			bullet.x = self.x;
			bullet.y = self.y;
			var dx = nearestEnemy.x - self.x;
			var dy = nearestEnemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				bullet.directionX = dx / distance;
				bullet.directionY = dy / distance;
			}
			npcBullets.push(bullet);
			game.addChild(bullet);
			self.ammo--; // Consume ammo
			self.shootCooldown = 30; // Slower than player
			LK.getSound('shoot').play();
		}
	};
	self.addAmmo = function (amount) {
		self.ammo = Math.min(self.maxAmmo, self.ammo + amount);
	};
	self.takeDamage = function (amount) {
		self.health -= amount;
		LK.effects.flashObject(self, 0xff0000, 300);
		if (self.health <= 0) {
			return true; // NPC died
		}
		return false;
	};
	return self;
});
var NPCBullet = Container.expand(function () {
	var self = Container.call(this);
	// Difficulty-based bullet properties
	var difficultyAssets = ['npcBulletEasy', 'npcBulletNormal', 'npcBulletHard', 'npcBulletNightmare'];
	var difficultyProps = [{
		speed: 10,
		damage: 80,
		color: 0x00ff88
	},
	// Easy: slower, less damage
	{
		speed: 12,
		damage: 100,
		color: 0x88ff00
	},
	// Normal: standard
	{
		speed: 14,
		damage: 120,
		color: 0xffaa00
	},
	// Hard: faster, more damage
	{
		speed: 16,
		damage: 140,
		color: 0xff4400
	} // Nightmare: fastest, most damage
	];
	var props = difficultyProps[selectedDifficulty - 1];
	var assetId = difficultyAssets[selectedDifficulty - 1];
	var bulletGraphics = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = props.speed;
	self.damage = props.damage;
	self.directionX = 0;
	self.directionY = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		self.x += self.directionX * self.speed;
		self.y += self.directionY * self.speed;
		// Remove if out of bounds
		if (self.x < -50 || self.x > 2098 || self.y < -50 || self.y > 2782) {
			return true; // Should be removed
		}
		return false;
	};
	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.ammo = 30;
	self.maxAmmo = 30;
	self.speed = 8;
	self.shootCooldown = 0;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
		// Keep player in bounds
		if (self.x < 40) self.x = 40;
		if (self.x > 2008) self.x = 2008;
		if (self.y < 40) self.y = 40;
		if (self.y > 2692) self.y = 2692;
	};
	self.takeDamage = function (amount) {
		self.health -= amount;
		if (self.health <= 0) {
			self.health = 0;
			LK.showGameOver();
		}
		LK.effects.flashObject(self, 0xff0000, 500);
	};
	self.heal = function (amount) {
		self.health = Math.min(self.maxHealth, self.health + amount);
	};
	self.addAmmo = function (amount) {
		self.ammo = Math.min(self.maxAmmo, self.ammo + amount);
	};
	self.canShoot = function () {
		return self.ammo > 0 && self.shootCooldown <= 0;
	};
	self.shoot = function () {
		if (self.canShoot()) {
			self.ammo--;
			self.shootCooldown = 15;
			return true;
		}
		return false;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0400ff
});

/**** 
* Game Code
****/ 
var menuScreen = null;
var modeSelectionScreen = null;
var difficultySelectionScreen = null;
var gameStarted = false;
var selectedGameMode = 1;
var selectedDifficulty = 2; // 1=easy, 2=normal, 3=hard, 4=nightmare 
// Game variables
var player = null;
var enemies = [];
var bullets = [];
var npcBullets = [];
var bazookaBullets = [];
var bazooka = null;
var healthPacks = [];
var ammoBoxes = [];
var boss = null;
var bossSpawned = false;
var npcs = [];
var gameTimer = 0;
var enemySpawnTimer = 0;
var waveNumber = 1;
var enemiesKilled = 0;
var survivalTime = 0;
var eclipsePhase = 0; // 0=normal, 1=blood moon, 2=eclipse
var eclipseTimer = 0;
var usingBazooka = false;
// UI elements
var healthText = null;
var ammoText = null;
var waveText = null;
var timeText = null;
var eclipseText = null;
var bossHealthText = null;
var bazookaInstructionText = null;
function startGame() {
	// Show mode selection screen instead of starting game directly
	showModeSelection();
}
function showMenu() {
	if (!menuScreen) {
		menuScreen = new MenuScreen();
		game.addChild(menuScreen);
		LK.playMusic('menumusic');
	}
}
function showModeSelection() {
	if (!modeSelectionScreen) {
		modeSelectionScreen = new ModeSelectionScreen();
		game.addChild(modeSelectionScreen);
		LK.playMusic('menumusic');
	}
}
function showDifficultySelection() {
	if (!difficultySelectionScreen) {
		difficultySelectionScreen = new DifficultySelectionScreen();
		game.addChild(difficultySelectionScreen);
		LK.playMusic('menumusic');
	}
}
function startGameWithMode(mode) {
	selectedGameMode = mode;
	gameStarted = true;
	initializeGame();
}
function startGameWithModeAndDifficulty(mode, difficulty) {
	selectedGameMode = mode;
	selectedDifficulty = difficulty;
	gameStarted = true;
	initializeGame();
}
function initializeGame() {
	// Clear game state
	enemies = [];
	bullets = [];
	npcBullets = [];
	bazookaBullets = [];
	healthPacks = [];
	ammoBoxes = [];
	npcs = [];
	boss = null;
	bossSpawned = false;
	gameTimer = 0;
	enemySpawnTimer = 0;
	waveNumber = 1;
	enemiesKilled = 0;
	survivalTime = 0;
	eclipsePhase = 0;
	eclipseTimer = 0;
	// Create player
	player = new Player();
	player.x = 1024;
	player.y = 1366;
	game.addChild(player);
	// Create bazooka
	bazooka = new Bazooka();
	bazooka.x = 1024;
	bazooka.y = 2000;
	game.addChild(bazooka);
	// Create UI
	healthText = new Text2('Health: 100', {
		size: 40,
		fill: 0x00ff00
	});
	healthText.x = 150;
	healthText.y = 150;
	LK.gui.topLeft.addChild(healthText);
	ammoText = new Text2('Ammo: 30', {
		size: 40,
		fill: 0xffff00
	});
	ammoText.x = 150;
	ammoText.y = 200;
	LK.gui.topLeft.addChild(ammoText);
	timeText = new Text2('Time: 0:00', {
		size: 40,
		fill: 0xffffff
	});
	timeText.anchor.set(1, 0);
	timeText.x = -50;
	timeText.y = 150;
	LK.gui.topRight.addChild(timeText);
	if (selectedGameMode === 3) {
		eclipseText = new Text2('Phase: Normal', {
			size: 40,
			fill: 0xff6666
		});
		eclipseText.anchor.set(1, 0);
		eclipseText.x = -50;
		eclipseText.y = 200;
		LK.gui.topRight.addChild(eclipseText);
	}
	// Spawn 10 NPCs at game start
	for (var i = 0; i < 10; i++) {
		spawnNPC();
	}
	// Create bazooka instruction text
	bazookaInstructionText = new Text2('BAZOOKA, CLICK TO LAUNCH', {
		size: 50,
		fill: 0xffaa00
	});
	bazookaInstructionText.anchor.set(0.5, 0);
	bazookaInstructionText.x = bazooka.x;
	bazookaInstructionText.y = bazooka.y + 30;
	game.addChild(bazookaInstructionText);
	// Create bazooka description text with difficulty-based percentages
	var bazookaChances = [{
		target: 85,
		blank: 12,
		explode: 3
	},
	// Easy
	{
		target: 75,
		blank: 15,
		explode: 10
	},
	// Normal
	{
		target: 65,
		blank: 20,
		explode: 15
	},
	// Hard
	{
		target: 50,
		blank: 25,
		explode: 25
	} // Nightmare
	];
	var chances = bazookaChances[selectedDifficulty - 1];
	var bazookaDescriptionText = new Text2(chances.target + '% target enemy, ' + chances.blank + '% blank ammo, ' + chances.explode + '% self explode', {
		size: 40,
		fill: 0xffcc66
	});
	bazookaDescriptionText.anchor.set(0.5, 0);
	bazookaDescriptionText.x = bazooka.x;
	bazookaDescriptionText.y = bazooka.y + 80;
	game.addChild(bazookaDescriptionText);
	// Fade out instruction text after 3 seconds
	tween(bazookaInstructionText, {
		alpha: 0
	}, {
		duration: 3000,
		onFinish: function onFinish() {
			if (bazookaInstructionText) {
				bazookaInstructionText.destroy();
				bazookaInstructionText = null;
			}
		}
	});
	// Fade out description text after 3 seconds
	tween(bazookaDescriptionText, {
		alpha: 0
	}, {
		duration: 3000,
		onFinish: function onFinish() {
			if (bazookaDescriptionText) {
				bazookaDescriptionText.destroy();
				bazookaDescriptionText = null;
			}
		}
	});
	// Start background music
	LK.playMusic('bgmusic');
}
function spawnEnemy() {
	var enemy = new Enemy();
	// Spawn from random edge
	var edge = Math.floor(Math.random() * 4);
	switch (edge) {
		case 0:
			// Top
			enemy.x = Math.random() * 2048;
			enemy.y = -30;
			break;
		case 1:
			// Right
			enemy.x = 2078;
			enemy.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			enemy.x = Math.random() * 2048;
			enemy.y = 2762;
			break;
		case 3:
			// Left
			enemy.x = -30;
			enemy.y = Math.random() * 2732;
			break;
	}
	// Apply difficulty-based health, speed and damage values
	var difficultyMultipliers = [{
		health: 35,
		// Easy: 35 health
		speed: 0.8,
		damage: 0.7
	},
	// Easy
	{
		health: 50,
		// Normal: 50 health (default)
		speed: 1.0,
		damage: 1.0
	},
	// Normal
	{
		health: 75,
		// Hard: 75 health
		speed: 1.2,
		damage: 1.3
	},
	// Hard
	{
		health: 100,
		// Nightmare: 100 health
		speed: 1.4,
		damage: 1.6
	} // Nightmare
	];
	var multiplier = difficultyMultipliers[selectedDifficulty - 1];
	enemy.health = multiplier.health;
	enemy.speed *= multiplier.speed;
	enemy.damage = Math.floor(enemy.damage * multiplier.damage);
	// Adjust enemy stats based on mode and wave
	if (selectedGameMode === 2) {
		// Endless Nightmare 
		enemy.health += waveNumber * 10;
		enemy.speed += waveNumber * 0.3;
		enemy.damage += waveNumber * 5;
	} else if (selectedGameMode === 3) {
		// Blood Eclipse 
		enemy.health += waveNumber * 15;
		enemy.speed += waveNumber * 0.5;
		enemy.damage += waveNumber * 8;
		if (eclipsePhase === 1) {
			// Blood moon
			enemy.health *= 1.5;
			enemy.speed *= 1.3;
		} else if (eclipsePhase === 2) {
			// Eclipse
			enemy.health *= 2;
			enemy.speed *= 1.5;
			enemy.damage *= 1.5;
		}
	}
	enemies.push(enemy);
	game.addChild(enemy);
}
function spawnHealthPack() {
	var healthPack = new HealthPack();
	healthPack.x = 100 + Math.random() * 1848;
	healthPack.y = 100 + Math.random() * 2532;
	healthPacks.push(healthPack);
	game.addChild(healthPack);
}
function spawnAmmoBox() {
	var ammoBox = new AmmoBox();
	ammoBox.x = 100 + Math.random() * 1848;
	ammoBox.y = 100 + Math.random() * 2532;
	ammoBoxes.push(ammoBox);
	game.addChild(ammoBox);
}
function spawnNPC() {
	var npc = new NPC();
	// Spawn near player but not too close
	var angle = Math.random() * Math.PI * 2;
	var distance = 150 + Math.random() * 100; // 150-250 pixels from player
	npc.x = player.x + Math.cos(angle) * distance;
	npc.y = player.y + Math.sin(angle) * distance;
	// Keep in bounds
	if (npc.x < 40) npc.x = 40;
	if (npc.x > 2008) npc.x = 2008;
	if (npc.y < 40) npc.y = 40;
	if (npc.y > 2692) npc.y = 2692;
	npcs.push(npc);
	game.addChild(npc);
}
function spawnBoss() {
	boss = new Boss();
	boss.x = 1024;
	boss.y = 100;
	bossSpawned = true;
	game.addChild(boss);
	// Create boss health UI
	bossHealthText = new Text2('BOSS: 100000 / 100000', {
		size: 50,
		fill: 0xff0000
	});
	bossHealthText.anchor.set(0.5, 0);
	LK.gui.top.addChild(bossHealthText);
}
function fireBullet(targetX, targetY) {
	if (player && player.shoot() && !usingBazooka) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		// Find nearest enemy to target
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			var enemy = enemies[i];
			var dx = enemy.x - player.x;
			var dy = enemy.y - player.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				nearestEnemy = enemy;
			}
		}
		// If we found an enemy, target it; otherwise use tap location
		var dx, dy, distance;
		if (nearestEnemy) {
			dx = nearestEnemy.x - player.x;
			dy = nearestEnemy.y - player.y;
		} else {
			dx = targetX - player.x;
			dy = targetY - player.y;
		}
		distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			bullet.directionX = dx / distance;
			bullet.directionY = dy / distance;
		}
		bullets.push(bullet);
		game.addChild(bullet);
		// Play shooting sound
		LK.getSound('shoot').play();
	}
}
function updateGameMode() {
	gameTimer++;
	survivalTime = Math.floor(gameTimer / 60);
	// Spawn boss at 06:00 (360 seconds) - but not in endless nightmare mode
	if (survivalTime >= 360 && !bossSpawned && selectedGameMode !== 2) {
		spawnBoss();
	}
	// Mode specific logic
	if (selectedGameMode === 1) {
		// Classic Survival
		// Win condition: survive 5 minutes
		if (survivalTime >= 300) {
			LK.showYouWin();
			return;
		}
		// Spawn enemies based on time
		if (gameTimer % Math.max(30, 120 - survivalTime) === 0) {
			spawnEnemy();
		}
		// Spawn resources occasionally (adjusted by difficulty)
		var resourceMultipliers = [0.7, 1.0, 1.4, 2.0]; // Easy, Normal, Hard, Nightmare
		var resourceDelay = resourceMultipliers[selectedDifficulty - 1];
		if (gameTimer % Math.floor(600 * resourceDelay) === 0) spawnHealthPack();
		if (gameTimer % Math.floor(900 * resourceDelay) === 0) spawnAmmoBox();
		// NPCs already spawned at game start - no additional spawning needed
	} else if (selectedGameMode === 2) {
		// Endless Nightmare
		// New wave every 30 seconds
		var newWave = Math.floor(survivalTime / 30) + 1;
		if (newWave > waveNumber) {
			waveNumber = newWave;
		}
		// Spawn enemies more frequently as waves progress
		var spawnRate = Math.max(10, 60 - waveNumber * 3);
		if (gameTimer % spawnRate === 0) {
			spawnEnemy();
		}
		// Spawn resources based on wave (adjusted by difficulty)
		var resourceMultipliers = [0.7, 1.0, 1.4, 2.0]; // Easy, Normal, Hard, Nightmare
		var resourceDelay = resourceMultipliers[selectedDifficulty - 1];
		if (gameTimer % Math.floor((600 - waveNumber * 20) * resourceDelay) === 0) spawnHealthPack();
		if (gameTimer % Math.floor((900 - waveNumber * 30) * resourceDelay) === 0) spawnAmmoBox();
		// NPCs already spawned at game start - no additional spawning needed
	} else if (selectedGameMode === 3) {
		// Blood Eclipse
		eclipseTimer++;
		// Eclipse phases: 90s normal, 60s blood moon, 30s eclipse, repeat
		var cycleTime = eclipseTimer % (180 * 60); // 3 minutes cycle
		if (cycleTime < 90 * 60) {
			eclipsePhase = 0; // Normal
		} else if (cycleTime < 150 * 60) {
			eclipsePhase = 1; // Blood moon
		} else {
			eclipsePhase = 2; // Eclipse
		}
		// Spawn rate increases with phase
		var spawnRate = [60, 30, 15][eclipsePhase];
		if (gameTimer % spawnRate === 0) {
			spawnEnemy();
		}
		// Resources spawn less during eclipse phases (adjusted by difficulty)
		var resourceRate = [600, 800, 1200][eclipsePhase];
		var resourceMultipliers = [0.7, 1.0, 1.4, 2.0]; // Easy, Normal, Hard, Nightmare
		var adjustedRate = Math.floor(resourceRate * resourceMultipliers[selectedDifficulty - 1]);
		if (gameTimer % adjustedRate === 0) spawnHealthPack();
		if (gameTimer % Math.floor(adjustedRate * 1.5) === 0) spawnAmmoBox();
		// NPCs already spawned at game start - no additional spawning needed
	}
}
function updateUI() {
	if (healthText) {
		healthText.setText('Health: ' + player.health);
		healthText.fill = player.health > 30 ? 0x00ff00 : 0xff0000;
	}
	if (ammoText) {
		ammoText.setText('Ammo: ' + player.ammo);
		ammoText.fill = player.ammo > 5 ? 0xffff00 : 0xff0000;
	}
	if (timeText) {
		var minutes = Math.floor(survivalTime / 60);
		var seconds = survivalTime % 60;
		timeText.setText('Time: ' + minutes + ':' + (seconds < 10 ? '0' : '') + seconds);
	}
	if (eclipseText && selectedGameMode === 3) {
		var phases = ['Normal', 'Blood Moon', 'Eclipse'];
		eclipseText.setText('Phase: ' + phases[eclipsePhase]);
		eclipseText.fill = [0xffffff, 0xff6666, 0x660000][eclipsePhase];
	}
	if (bossHealthText && boss) {
		bossHealthText.setText('BOSS: ' + boss.health + ' / ' + boss.maxHealth);
	}
}
// Show menu on game start
showMenu();
game.down = function (x, y, obj) {
	if (gameStarted && player) {
		fireBullet(x, y);
	}
};
game.move = function (x, y, obj) {
	if (gameStarted && player) {
		player.x = x;
		player.y = y;
	}
};
game.update = function () {
	if (!gameStarted) {
		return;
	}
	if (!player) return;
	// Update game mode logic
	updateGameMode();
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].update();
		// Check if enemy should be removed
		if (enemies[i].health <= 0) {
			enemies[i].destroy();
			enemies.splice(i, 1);
			enemiesKilled++;
		}
	}
	// Update NPCs
	for (var i = npcs.length - 1; i >= 0; i--) {
		var npc = npcs[i];
		npc.update();
		// Check if NPC died
		if (npc.health <= 0) {
			npc.destroy();
			npcs.splice(i, 1);
			continue;
		}
		// Check NPC-enemy collisions (enemies can attack NPCs)
		for (var j = 0; j < enemies.length; j++) {
			var enemy = enemies[j];
			var dx = enemy.x - npc.x;
			var dy = enemy.y - npc.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < 50 && enemy.attackCooldown <= 0) {
				npc.takeDamage(enemy.damage);
				enemy.attackCooldown = 60;
				break;
			}
		}
		// Check NPC-boss collision
		if (boss) {
			var dx = boss.x - npc.x;
			var dy = boss.y - npc.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < 100 && boss.attackCooldown <= 0) {
				npc.takeDamage(boss.damage);
				boss.attackCooldown = 60;
			}
		}
	}
	// Update boss
	if (boss) {
		boss.update();
		// Check if boss died
		if (boss.health <= 0) {
			boss.destroy();
			boss = null;
			bossSpawned = false;
			if (bossHealthText) {
				bossHealthText.destroy();
				bossHealthText = null;
			}
			LK.showGameOver();
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		var shouldRemove = bullet.update();
		if (shouldRemove) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet-enemy collisions
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullet.intersects(enemies[j])) {
				var enemyDied = enemies[j].takeDamage(bullet.damage);
				bullet.destroy();
				bullets.splice(i, 1);
				if (enemyDied) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					enemiesKilled++;
				}
				break;
			}
		}
		// Check bullet-boss collision
		if (boss && bullet.intersects(boss)) {
			var bossDied = boss.takeDamage(bullet.damage);
			bullet.destroy();
			bullets.splice(i, 1);
			if (bossDied) {
				boss.destroy();
				boss = null;
				bossSpawned = false;
				if (bossHealthText) {
					bossHealthText.destroy();
					bossHealthText = null;
				}
				LK.showGameOver();
			}
			break;
		}
	}
	// Update NPC bullets
	for (var i = npcBullets.length - 1; i >= 0; i--) {
		var bullet = npcBullets[i];
		var shouldRemove = bullet.update();
		if (shouldRemove) {
			bullet.destroy();
			npcBullets.splice(i, 1);
			continue;
		}
		// Check NPC bullet-enemy collisions
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullet.intersects(enemies[j])) {
				var enemyDied = enemies[j].takeDamage(bullet.damage);
				bullet.destroy();
				npcBullets.splice(i, 1);
				if (enemyDied) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					enemiesKilled++;
				}
				break;
			}
		}
		// Check NPC bullet-boss collision
		if (boss && bullet.intersects(boss)) {
			var bossDied = boss.takeDamage(bullet.damage);
			bullet.destroy();
			npcBullets.splice(i, 1);
			if (bossDied) {
				boss.destroy();
				boss = null;
				bossSpawned = false;
				if (bossHealthText) {
					bossHealthText.destroy();
					bossHealthText = null;
				}
				LK.showGameOver();
			}
			break;
		}
	}
	// Update bazooka bullets
	for (var i = bazookaBullets.length - 1; i >= 0; i--) {
		var bullet = bazookaBullets[i];
		var shouldRemove = bullet.update();
		if (shouldRemove) {
			bullet.explode();
			bullet.destroy();
			bazookaBullets.splice(i, 1);
			continue;
		}
		// Check bazooka bullet-enemy collisions
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullet.intersects(enemies[j])) {
				bullet.explode();
				bullet.destroy();
				bazookaBullets.splice(i, 1);
				break;
			}
		}
		// Check bazooka bullet-boss collision
		if (boss && bullet.intersects(boss)) {
			bullet.explode();
			bullet.destroy();
			bazookaBullets.splice(i, 1);
			break;
		}
	}
	// Update bazooka
	if (bazooka) {
		bazooka.update();
	}
	// Update health packs
	for (var i = healthPacks.length - 1; i >= 0; i--) {
		var pack = healthPacks[i];
		var shouldRemove = pack.update();
		if (shouldRemove) {
			pack.destroy();
			healthPacks.splice(i, 1);
			continue;
		}
		// Check player collision
		if (player.intersects(pack)) {
			player.heal(pack.healAmount);
			LK.getSound('heal').play();
			pack.destroy();
			healthPacks.splice(i, 1);
		}
	}
	// Update ammo boxes
	for (var i = ammoBoxes.length - 1; i >= 0; i--) {
		var box = ammoBoxes[i];
		var shouldRemove = box.update();
		if (shouldRemove) {
			box.destroy();
			ammoBoxes.splice(i, 1);
			continue;
		}
		var collected = false;
		// Check player collision first (priority)
		if (player.intersects(box)) {
			player.addAmmo(box.ammoAmount);
			LK.getSound('ammo').play();
			box.destroy();
			ammoBoxes.splice(i, 1);
			collected = true;
		}
		// Check NPC collisions if not collected by player and NPC needs ammo
		if (!collected) {
			for (var k = 0; k < npcs.length; k++) {
				var npc = npcs[k];
				if (npc.intersects(box) && npc.ammo < npc.maxAmmo - 5) {
					// NPCs only take if they really need ammo (leave some for player)
					npc.addAmmo(Math.floor(box.ammoAmount * 0.6)); // NPCs get 60% of ammo amount
					LK.getSound('ammo').play();
					box.destroy();
					ammoBoxes.splice(i, 1);
					collected = true;
					break;
				}
			}
		}
	}
	// Update UI
	updateUI();
};

===================================================================
--- original.js
+++ change.js
@@ -787,9 +787,11 @@
 	var difficultyHealthValues = [120, 80, 60, 40]; // Easy, Normal, Hard, Nightmare
 	var baseHealth = difficultyHealthValues[selectedDifficulty - 1];
 	self.health = baseHealth;
 	self.maxHealth = baseHealth;
-	self.speed = 6;
+	// Apply difficulty-based speed values - more difficult = slower NPCs
+	var difficultySpeedValues = [8, 6, 4, 3]; // Easy, Normal, Hard, Nightmare
+	self.speed = difficultySpeedValues[selectedDifficulty - 1];
 	self.ammo = 20; // NPCs start with limited ammo
 	self.maxAmmo = 25; // Maximum ammo NPCs can carry
 	self.shootCooldown = 0;
 	self.lastX = 0;