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

/**** 
* Classes
****/ 
// Enemy: Drone
var Drone = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('drone', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 1;
	self.shootCooldown = 0;
	self.update = function () {
		self.x -= 8;
	};
	return self;
});
// Enemy bullet
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet_enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -18;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Explosion effect
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 1
	});
	// Animate fade out
	tween(gfx, {
		alpha: 0
	}, {
		duration: 400,
		easing: tween.linear,
		onFinish: function onFinish() {
			self.destroy();
		}
	});
	return self;
});
// Squad member: Medic
var Medic = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('medic', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 3;
	self.role = 'medic';
	self.update = function () {};
	return self;
});
// Player bullet
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('bullet_player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 32;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// Powerup: Ammo
var PowerupAmmo = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('powerup_ammo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= 6;
	};
	return self;
});
// Powerup: Health
var PowerupHealth = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('powerup_health', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= 6;
	};
	return self;
});
// Captain Rhea Morgan (player)
var Rhea = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('rhea', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 5;
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Squad member: Sniper
var Sniper = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('sniper', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 2;
	self.role = 'sniper';
	self.shootCooldown = 0;
	self.update = function () {};
	return self;
});
// Enemy: Tank (mini-boss)
var Tank = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('tank', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 10;
	self.shootCooldown = 0;
	self.update = function () {
		self.x -= 4;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222831
});

/**** 
* Game Code
****/ 
// Futuristic tank
// Futuristic sniper
// Rhea in high-tech armor
// Futuristic medic
// Advanced drone
// Chapter 2: Futuristic intense battlefield background
var battlefieldBg = LK.getAsset('chapter2_bg', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 2732,
	alpha: 1
});
game.addChild(battlefieldBg);
// Add destroyed futuristic vehicles, burning debris, and glowing lights (decorative background elements)
var burningTank = LK.getAsset('burning_tank', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1200,
	y: 2100,
	alpha: 0.85
});
game.addChild(burningTank);
var burningDebris = LK.getAsset('burning_debris', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 700,
	y: 1700,
	alpha: 0.8
});
game.addChild(burningDebris);
var glowLight1 = LK.getAsset('glow_light', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1500,
	y: 800,
	alpha: 0.7
});
game.addChild(glowLight1);
var glowLight2 = LK.getAsset('glow_light', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 400,
	y: 2200,
	alpha: 0.5
});
game.addChild(glowLight2);
// Animate glowing lights for a more dynamic effect
tween(glowLight1, {
	alpha: 0.2
}, {
	duration: 1200,
	yoyo: true,
	repeat: Infinity,
	easing: tween.sineInOut
});
tween(glowLight2, {
	alpha: 0.8
}, {
	duration: 900,
	yoyo: true,
	repeat: Infinity,
	easing: tween.sineInOut
});
// Add dark, cloudy sky overlay
var cloudySky = LK.getAsset('cloudy_sky', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 800,
	alpha: 0.7
});
game.addChild(cloudySky);
// Add burning embers (animated, semi-randomly drifting)
var embers = [];
for (var i = 0; i < 8; i++) {
	var ember = LK.getAsset('ember', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: Math.random() * 2048,
		y: 200 + Math.random() * 1800,
		alpha: 0.5 + Math.random() * 0.3
	});
	embers.push(ember);
	game.addChild(ember);
}
// Animate embers to drift upward and sideways, loop when off screen
game.update = function (origUpdate) {
	return function () {
		if (typeof origUpdate === "function") origUpdate.apply(this, arguments);
		for (var i = 0; i < embers.length; i++) {
			var e = embers[i];
			e.y -= 2 + Math.random() * 1.5;
			e.x += Math.sin(LK.ticks / 30 + i) * 0.7;
			if (e.y < 0) {
				e.y = 2200 + Math.random() * 400;
				e.x = Math.random() * 2048;
			}
		}
	};
}(game.update);
// Play music
// Main character: Captain Rhea Morgan
// Squad member: Medic
// Squad member: Sniper
// Enemy: Drone
// Enemy: Tank
// Bullet: Player
// Bullet: Enemy
// Powerup: Health
// Powerup: Ammo
// Explosion effect
// Sound effects
// Music
LK.playMusic('battle_theme');
// Game state variables
var rhea, medic, sniper;
var squad = [];
var playerBullets = [];
var enemyBullets = [];
var enemies = [];
var powerups = [];
var explosions = [];
var score = 0;
var resources = 0;
var gameOver = false;
var youWin = false;
var dragNode = null;
var lastTouchX = 0,
	lastTouchY = 0;
// Weapon/enemy upgrade flags
var weaponUpgraded = false;
var enemyUpgraded = false;
// UI
var scoreTxt = new Text2('0', {
	size: 100,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var hpTxt = new Text2('HP: 5', {
	size: 70,
	fill: 0xFF5252
});
// Move HP text to the upper left, avoiding the top left 100x100 px reserved area
hpTxt.anchor.set(0, 0);
hpTxt.x = 110; // 10px right of reserved area
hpTxt.y = 10;
LK.gui.topLeft.addChild(hpTxt);
var resourceTxt = new Text2('Res: 0', {
	size: 70,
	fill: 0xFFD600
});
resourceTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(resourceTxt);
// Initialize player and squad
rhea = new Rhea();
rhea.x = 400;
rhea.y = 2732 / 2;
game.addChild(rhea);
medic = new Medic();
medic.x = rhea.x - 120;
medic.y = rhea.y + 120;
game.addChild(medic);
sniper = new Sniper();
sniper.x = rhea.x - 120;
sniper.y = rhea.y - 120;
game.addChild(sniper);
squad = [rhea, medic, sniper];
// Helper: spawn enemy
function spawnEnemy() {
	var type = LK.ticks % 300 === 0 ? 'tank' : 'drone';
	var enemy;
	if (type === 'drone') {
		enemy = new Drone();
		enemy.x = 2048 + 60;
		enemy.y = 300 + Math.floor(Math.random() * (2732 - 600));
		if (enemyUpgraded) {
			enemy.hp = 3;
		}
	} else {
		enemy = new Tank();
		enemy.x = 2048 + 120;
		enemy.y = 400 + Math.floor(Math.random() * (2732 - 800));
		if (enemyUpgraded) {
			enemy.hp = 20;
		}
	}
	enemies.push(enemy);
	game.addChild(enemy);
}
// Helper: spawn powerup
function spawnPowerup() {
	var type = Math.random() < 0.5 ? 'health' : 'ammo';
	var powerup;
	if (type === 'health') {
		powerup = new PowerupHealth();
	} else {
		powerup = new PowerupAmmo();
	}
	powerup.x = 2048 + 60;
	powerup.y = 300 + Math.floor(Math.random() * (2732 - 600));
	powerups.push(powerup);
	game.addChild(powerup);
}
// Helper: fire player bullet
function firePlayerBullet(from) {
	var bullet = new PlayerBullet();
	bullet.x = from.x + 70;
	bullet.y = from.y;
	// Stronger sniper: sniper bullets do more damage
	if (from.role === 'sniper') {
		bullet.damage = weaponUpgraded ? 12 : 6;
	} else {
		bullet.damage = weaponUpgraded ? 7 : 3;
	}
	playerBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot_player').play();
}
// Helper: fire enemy bullet
function fireEnemyBullet(from) {
	var bullet = new EnemyBullet();
	bullet.x = from.x - 70;
	bullet.y = from.y;
	enemyBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot_enemy').play();
}
// Helper: show explosion
function showExplosion(x, y) {
	var exp = new Explosion();
	exp.x = x;
	exp.y = y;
	explosions.push(exp);
	game.addChild(exp);
	LK.getSound('explosion').play();
}
// Helper: update UI
function updateUI() {
	scoreTxt.setText(score);
	hpTxt.setText('HP: ' + rhea.hp);
	resourceTxt.setText('Res: ' + resources);
}
// Handle dragging Rhea (player)
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp to game area
		var minY = 120,
			maxY = 2732 - 120;
		dragNode.y = Math.max(minY, Math.min(maxY, y));
		lastTouchX = x;
		lastTouchY = y;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only allow dragging Rhea
	if (!gameOver && !youWin) {
		if (Math.abs(x - rhea.x) < 120 && Math.abs(y - rhea.y) < 120) {
			dragNode = rhea;
			handleMove(x, y, obj);
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game update loop
game.update = function () {
	if (gameOver || youWin) return;
	// Player auto-fire
	if (rhea.shootCooldown > 0) rhea.shootCooldown--;
	if (rhea.shootCooldown === 0) {
		firePlayerBullet(rhea);
		rhea.shootCooldown = 10;
	}
	// Sniper auto-fire (slower)
	if (sniper.shootCooldown > 0) sniper.shootCooldown--;
	if (sniper.shootCooldown === 0) {
		firePlayerBullet(sniper);
		sniper.shootCooldown = 30;
	}
	// Medic follows Rhea
	medic.x += (rhea.x - 120 - medic.x) * 0.15;
	medic.y += (rhea.y + 120 - medic.y) * 0.15;
	// Sniper follows Rhea
	sniper.x += (rhea.x - 120 - sniper.x) * 0.15;
	sniper.y += (rhea.y - 120 - sniper.y) * 0.15;
	// Spawn enemies
	if (LK.ticks % 120 === 0) {
		spawnEnemy();
	}
	// Spawn powerups
	if (LK.ticks % 180 === 0) {
		spawnPowerup();
	}
	// Update player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		// Remove if off screen
		if (b.x > 2048 + 60) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Hit enemy
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (b.intersects(e)) {
				var dmg = typeof b.damage === "number" ? b.damage : 3;
				e.hp -= dmg;
				showExplosion(b.x, b.y);
				b.destroy();
				playerBullets.splice(i, 1);
				if (e.hp <= 0) {
					showExplosion(e.x, e.y);
					score += e instanceof Tank ? 10 : 2;
					resources += e instanceof Tank ? 5 : 1;
					e.destroy();
					enemies.splice(j, 1);
				}
				updateUI();
				break;
			}
		}
	}
	// Update enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var b = enemyBullets[i];
		b.update();
		if (b.x < -60) {
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Hit squad
		for (var j = 0; j < squad.length; j++) {
			var s = squad[j];
			if (b.intersects(s)) {
				s.hp--;
				showExplosion(b.x, b.y);
				b.destroy();
				enemyBullets.splice(i, 1);
				if (s.hp <= 0) {
					showExplosion(s.x, s.y);
					if (s === rhea) {
						// Game over
						gameOver = true;
						LK.effects.flashScreen(0xff0000, 1000);
						LK.showGameOver();
						return;
					} else {
						s.destroy();
						squad.splice(j, 1);
					}
				}
				updateUI();
				break;
			}
		}
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		// Remove if off screen
		if (e.x < -200) {
			e.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// Enemy fire
		if (e.shootCooldown > 0) e.shootCooldown--;
		if (e.shootCooldown === 0) {
			// Only fire if on screen
			if (e.x < 2048 && e.x > 0) {
				fireEnemyBullet(e);
				e.shootCooldown = e instanceof Tank ? 30 : 60;
			}
		}
		// Collide with player
		if (e.intersects(rhea)) {
			rhea.hp -= 2;
			showExplosion(e.x, e.y);
			e.destroy();
			enemies.splice(i, 1);
			if (rhea.hp <= 0) {
				gameOver = true;
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
			updateUI();
		}
	}
	// Update powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		p.update();
		if (p.x < -60) {
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
		// Pickup by player
		if (p.intersects(rhea)) {
			if (p instanceof PowerupHealth) {
				rhea.hp = Math.min(rhea.hp + 2, 7);
			} else if (p instanceof PowerupAmmo) {
				// For MVP, just increase resources
				resources += 2;
			}
			LK.getSound('pickup').play();
			p.destroy();
			powerups.splice(i, 1);
			updateUI();
		}
	}
	// Upgrade weapon and enemies at score 20
	if (!weaponUpgraded && score >= 20) {
		weaponUpgraded = true;
	}
	if (!enemyUpgraded && score >= 20) {
		enemyUpgraded = true;
	}
	// Win condition: score threshold
	if (score >= 50) {
		youWin = true;
		LK.effects.flashScreen(0x00ff00, 1000);
		// Show 'You are a Real Player' as a gesture
		var playerTxt = new Text2('You are a Real Player', {
			size: 140,
			fill: 0xFFD700,
			font: "Impact, 'Arial Black', Tahoma"
		});
		playerTxt.anchor.set(0.5, 0.5);
		playerTxt.x = 2048 / 2;
		playerTxt.y = 2732 / 2;
		game.addChild(playerTxt);
		LK.showYouWin();
		return;
	}
};
// Initial UI update
updateUI();

===================================================================
--- original.js
+++ change.js
@@ -151,19 +151,113 @@
 
 /**** 
 * Game Code
 ****/ 
-// World War I background image
-var battlefieldBg = LK.getAsset('ww1_bg', {
+// Futuristic tank
+// Futuristic sniper
+// Rhea in high-tech armor
+// Futuristic medic
+// Advanced drone
+// Chapter 2: Futuristic intense battlefield background
+var battlefieldBg = LK.getAsset('chapter2_bg', {
 	anchorX: 0,
 	anchorY: 0,
 	x: 0,
 	y: 0,
 	width: 2048,
 	height: 2732,
-	alpha: 0.35
+	alpha: 1
 });
 game.addChild(battlefieldBg);
+// Add destroyed futuristic vehicles, burning debris, and glowing lights (decorative background elements)
+var burningTank = LK.getAsset('burning_tank', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 1200,
+	y: 2100,
+	alpha: 0.85
+});
+game.addChild(burningTank);
+var burningDebris = LK.getAsset('burning_debris', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 700,
+	y: 1700,
+	alpha: 0.8
+});
+game.addChild(burningDebris);
+var glowLight1 = LK.getAsset('glow_light', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 1500,
+	y: 800,
+	alpha: 0.7
+});
+game.addChild(glowLight1);
+var glowLight2 = LK.getAsset('glow_light', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 400,
+	y: 2200,
+	alpha: 0.5
+});
+game.addChild(glowLight2);
+// Animate glowing lights for a more dynamic effect
+tween(glowLight1, {
+	alpha: 0.2
+}, {
+	duration: 1200,
+	yoyo: true,
+	repeat: Infinity,
+	easing: tween.sineInOut
+});
+tween(glowLight2, {
+	alpha: 0.8
+}, {
+	duration: 900,
+	yoyo: true,
+	repeat: Infinity,
+	easing: tween.sineInOut
+});
+// Add dark, cloudy sky overlay
+var cloudySky = LK.getAsset('cloudy_sky', {
+	anchorX: 0,
+	anchorY: 0,
+	x: 0,
+	y: 0,
+	width: 2048,
+	height: 800,
+	alpha: 0.7
+});
+game.addChild(cloudySky);
+// Add burning embers (animated, semi-randomly drifting)
+var embers = [];
+for (var i = 0; i < 8; i++) {
+	var ember = LK.getAsset('ember', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		x: Math.random() * 2048,
+		y: 200 + Math.random() * 1800,
+		alpha: 0.5 + Math.random() * 0.3
+	});
+	embers.push(ember);
+	game.addChild(ember);
+}
+// Animate embers to drift upward and sideways, loop when off screen
+game.update = function (origUpdate) {
+	return function () {
+		if (typeof origUpdate === "function") origUpdate.apply(this, arguments);
+		for (var i = 0; i < embers.length; i++) {
+			var e = embers[i];
+			e.y -= 2 + Math.random() * 1.5;
+			e.x += Math.sin(LK.ticks / 30 + i) * 0.7;
+			if (e.y < 0) {
+				e.y = 2200 + Math.random() * 400;
+				e.x = Math.random() * 2048;
+			}
+		}
+	};
+}(game.update);
 // Play music
 // Main character: Captain Rhea Morgan
 // Squad member: Medic
 // Squad member: Sniper