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

/**** 
* Classes
****/ 
var Aircraft = Container.expand(function () {
	var self = Container.call(this);
	var aircraftGraphics = self.attachAsset('aircraft', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxAircraft', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.targetX = 0;
	self.targetY = 0;
	self.velocityX = 0;
	self.velocityY = 0;
	self.banking = 0;
	self.maxSpeed = 8;
	self.acceleration = 0.3;
	self.friction = 0.85;
	self.update = function () {
		// Calculate movement towards target
		var deltaX = self.targetX - self.x;
		var deltaY = self.targetY - self.y;
		// Apply acceleration towards target
		self.velocityX += deltaX * self.acceleration * 0.01;
		self.velocityY += deltaY * self.acceleration * 0.01;
		// Apply friction
		self.velocityX *= self.friction;
		self.velocityY *= self.friction;
		// Limit max speed
		var speed = Math.sqrt(self.velocityX * self.velocityX + self.velocityY * self.velocityY);
		if (speed > self.maxSpeed) {
			self.velocityX = self.velocityX / speed * self.maxSpeed;
			self.velocityY = self.velocityY / speed * self.maxSpeed;
		}
		// Update position
		self.x += self.velocityX;
		self.y += self.velocityY;
		// Banking animation based on horizontal movement
		var targetBanking = self.velocityX * 0.1;
		self.banking += (targetBanking - self.banking) * 0.1;
		aircraftGraphics.rotation = self.banking;
		// Keep aircraft within screen bounds
		if (self.x < 60) self.x = 60;
		if (self.x > 1988) self.x = 1988;
		if (self.y < 100) self.y = 100;
		if (self.y > 2632) self.y = 2632;
		// Create engine smoke trail
		if (LK.ticks % 3 == 0) {
			var smoke = new Smoke();
			// Position smoke at aircraft engine (behind aircraft)
			smoke.x = self.x + Math.sin(self.banking) * 30 - Math.cos(self.banking) * 50;
			smoke.y = self.y - Math.sin(self.banking) * 50 + Math.cos(self.banking) * 30;
			game.addChild(smoke);
			smokes.push(smoke);
		}
	};
	return self;
});
var Bonus = Container.expand(function () {
	var self = Container.call(this);
	var bonusGraphics = self.attachAsset('bonus', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxBonus', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.speed = 2.5;
	self.rotationSpeed = 0.1;
	self.update = function () {
		self.y += self.speed;
		bonusGraphics.rotation += self.rotationSpeed;
	};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.speed = -8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var FastObstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('fastObstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxFastObstacle', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.speed = 5;
	self.zigzagSpeed = 3;
	self.zigzagOffset = 0;
	self.initialX = 0;
	self.update = function () {
		self.y += self.speed;
		self.zigzagOffset += 0.15;
		self.x = self.initialX + Math.sin(self.zigzagOffset) * 150;
		obstacleGraphics.rotation += 0.1;
	};
	return self;
});
var Fuel = Container.expand(function () {
	var self = Container.call(this);
	var fuelGraphics = self.attachAsset('fuel', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxFuel', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.speed = 2;
	self.bobOffset = 0;
	self.update = function () {
		self.y += self.speed;
		self.bobOffset += 0.2;
		fuelGraphics.y = Math.sin(self.bobOffset) * 5;
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var hitboxGraphics = self.attachAsset('hitboxObstacle', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.speed = 3;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Smoke = Container.expand(function () {
	var self = Container.call(this);
	var smokeGraphics = self.attachAsset('smoke', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.life = 60;
	self.maxLife = 60;
	self.velocityX = (Math.random() - 0.5) * 2;
	self.velocityY = Math.random() * 2 + 1;
	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
	self.initialScale = 0.3 + Math.random() * 0.4;
	self.scaleX = self.initialScale;
	self.scaleY = self.initialScale;
	self.update = function () {
		self.life--;
		self.alpha = self.life / self.maxLife;
		// Smoke expands as it ages
		var ageRatio = 1 - self.life / self.maxLife;
		var scale = self.initialScale + ageRatio * 1.5;
		self.scaleX = scale;
		self.scaleY = scale;
		// Smoke drifts and rises
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.velocityY += 0.1; // Slight upward acceleration
		smokeGraphics.rotation += self.rotationSpeed;
		// Fade to lighter gray as it ages
		var grayValue = Math.floor(0x88 + ageRatio * 0x44);
		smokeGraphics.tint = grayValue << 16 | grayValue << 8 | grayValue;
	};
	return self;
});
var Trail = Container.expand(function () {
	var self = Container.call(this);
	var trailGraphics = self.attachAsset('trail', {
		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;
		self.scaleY = self.alpha;
		self.y += 1;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var aircraft = game.addChild(new Aircraft());
aircraft.x = 1024;
aircraft.y = 2000;
aircraft.targetX = aircraft.x;
aircraft.targetY = aircraft.y;
var obstacles = [];
var fastObstacles = [];
var fuels = [];
var bonuses = [];
var trails = [];
var smokes = [];
var bullets = [];
var isShootingMode = false;
var shootingEndTime = 0;
var lastBulletSpawn = 0;
var fuelLevel = 100;
var maxFuel = 100;
var gameSpeed = 1;
var distance = 0;
var lastObstacleSpawn = 0;
var lastFastObstacleSpawn = 0;
var lastFuelSpawn = 0;
var lastBonusSpawn = 0;
var isDragging = false;
// UI Elements
var scoreText = new Text2('Distance: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
var fuelText = new Text2('Fuel: 100%', {
	size: 50,
	fill: 0xFFFFFF
});
fuelText.anchor.set(1, 0);
LK.gui.topRight.addChild(fuelText);
// Event handlers
game.down = function (x, y, obj) {
	isDragging = true;
	aircraft.targetX = x;
	aircraft.targetY = y;
};
game.move = function (x, y, obj) {
	if (isDragging) {
		aircraft.targetX = x;
		aircraft.targetY = y;
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
game.update = function () {
	// Update distance and speed
	distance += gameSpeed;
	gameSpeed += 0.001;
	// Fuel consumption
	fuelLevel -= 0.075;
	if (fuelLevel <= 0) {
		LK.showGameOver();
		return;
	}
	// Spawn obstacles
	if (LK.ticks - lastObstacleSpawn > 60 - gameSpeed * 5) {
		var obstacle = new Obstacle();
		obstacle.x = Math.random() * 1800 + 100;
		obstacle.y = -50;
		obstacle.speed = 2 + gameSpeed;
		obstacles.push(obstacle);
		game.addChild(obstacle);
		lastObstacleSpawn = LK.ticks;
	}
	// Spawn fast obstacles
	if (LK.ticks - lastFastObstacleSpawn > 120 - gameSpeed * 8) {
		var fastObstacle = new FastObstacle();
		fastObstacle.x = Math.random() * 1400 + 300;
		fastObstacle.initialX = fastObstacle.x;
		fastObstacle.y = -50;
		fastObstacle.speed = 4 + gameSpeed * 1.5;
		fastObstacles.push(fastObstacle);
		game.addChild(fastObstacle);
		lastFastObstacleSpawn = LK.ticks;
	}
	// Spawn fuel
	if (LK.ticks - lastFuelSpawn > 180) {
		var fuel = new Fuel();
		fuel.x = Math.random() * 1800 + 100;
		fuel.y = -50;
		fuel.speed = 2 + gameSpeed * 0.5;
		fuels.push(fuel);
		game.addChild(fuel);
		lastFuelSpawn = LK.ticks;
	}
	// Spawn bonus
	if (LK.ticks - lastBonusSpawn > 300) {
		var bonus = new Bonus();
		bonus.x = Math.random() * 1800 + 100;
		bonus.y = -50;
		bonus.speed = 2 + gameSpeed * 0.5;
		bonuses.push(bonus);
		game.addChild(bonus);
		lastBonusSpawn = LK.ticks;
	}
	// Update and check obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		if (obstacle.lastY === undefined) obstacle.lastY = obstacle.y;
		if (obstacle.lastIntersecting === undefined) obstacle.lastIntersecting = false;
		// Remove off-screen obstacles
		if (obstacle.lastY < 2800 && obstacle.y >= 2800) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check pixel-perfect collision with aircraft
		var deltaX = Math.abs(aircraft.x - obstacle.x);
		var deltaY = Math.abs(aircraft.y - obstacle.y);
		var currentIntersecting = deltaX < 75 && deltaY < 40; // Tight pixel collision bounds
		if (!obstacle.lastIntersecting && currentIntersecting) {
			LK.getSound('explosion').play();
			LK.effects.flashScreen(0xff0000, 1000);
			// Aircraft explosion animation
			tween(aircraft, {
				scaleX: 2,
				scaleY: 2,
				alpha: 0,
				rotation: Math.PI * 2
			}, {
				duration: 800,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					LK.showGameOver();
				}
			});
			return;
		}
		obstacle.lastY = obstacle.y;
		obstacle.lastIntersecting = currentIntersecting;
	}
	// Update and check fast obstacles
	for (var i = fastObstacles.length - 1; i >= 0; i--) {
		var fastObstacle = fastObstacles[i];
		if (fastObstacle.lastY === undefined) fastObstacle.lastY = fastObstacle.y;
		if (fastObstacle.lastIntersecting === undefined) fastObstacle.lastIntersecting = false;
		// Remove off-screen fast obstacles
		if (fastObstacle.lastY < 2800 && fastObstacle.y >= 2800) {
			fastObstacle.destroy();
			fastObstacles.splice(i, 1);
			continue;
		}
		// Check pixel-perfect collision with aircraft
		var deltaX = Math.abs(aircraft.x - fastObstacle.x);
		var deltaY = Math.abs(aircraft.y - fastObstacle.y);
		var currentIntersecting = deltaX < 65 && deltaY < 60; // Tight pixel collision bounds for fast obstacle
		if (!fastObstacle.lastIntersecting && currentIntersecting) {
			LK.getSound('explosion').play();
			LK.effects.flashScreen(0xff0000, 1000);
			// Aircraft explosion animation
			tween(aircraft, {
				scaleX: 2,
				scaleY: 2,
				alpha: 0,
				rotation: Math.PI * 2
			}, {
				duration: 800,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					LK.showGameOver();
				}
			});
			return;
		}
		fastObstacle.lastY = fastObstacle.y;
		fastObstacle.lastIntersecting = currentIntersecting;
	}
	// Update and check fuel pickups
	for (var i = fuels.length - 1; i >= 0; i--) {
		var fuel = fuels[i];
		if (fuel.lastY === undefined) fuel.lastY = fuel.y;
		if (fuel.lastIntersecting === undefined) fuel.lastIntersecting = false;
		// Remove off-screen fuel
		if (fuel.lastY < 2800 && fuel.y >= 2800) {
			fuel.destroy();
			fuels.splice(i, 1);
			continue;
		}
		// Check collection
		var currentIntersecting = fuel.intersects(aircraft);
		if (!fuel.lastIntersecting && currentIntersecting) {
			LK.getSound('collect').play();
			fuelLevel = Math.min(fuelLevel + 25, maxFuel);
			LK.setScore(LK.getScore() + 10);
			fuel.destroy();
			fuels.splice(i, 1);
			continue;
		}
		fuel.lastY = fuel.y;
		fuel.lastIntersecting = currentIntersecting;
	}
	// Update and check bonus items
	for (var i = bonuses.length - 1; i >= 0; i--) {
		var bonus = bonuses[i];
		if (bonus.lastY === undefined) bonus.lastY = bonus.y;
		if (bonus.lastIntersecting === undefined) bonus.lastIntersecting = false;
		// Remove off-screen bonus
		if (bonus.lastY < 2800 && bonus.y >= 2800) {
			bonus.destroy();
			bonuses.splice(i, 1);
			continue;
		}
		// Check collection
		var currentIntersecting = bonus.intersects(aircraft);
		if (!bonus.lastIntersecting && currentIntersecting) {
			LK.getSound('collect').play();
			LK.setScore(LK.getScore() + 50);
			// Activate shooting mode for 3 seconds
			isShootingMode = true;
			shootingEndTime = LK.ticks + 180; // 3 seconds at 60 FPS
			// Flash aircraft to indicate power-up
			tween(aircraft, {
				tint: 0xff0000
			}, {
				duration: 200,
				onFinish: function onFinish() {
					tween(aircraft, {
						tint: 0xffffff
					}, {
						duration: 200
					});
				}
			});
			bonus.destroy();
			bonuses.splice(i, 1);
			continue;
		}
		bonus.lastY = bonus.y;
		bonus.lastIntersecting = currentIntersecting;
	}
	// Handle shooting mode
	if (isShootingMode) {
		if (LK.ticks >= shootingEndTime) {
			isShootingMode = false;
		}
		// Spawn bullets
		if (LK.ticks - lastBulletSpawn > 10) {
			// Shoot every 10 ticks
			var bullet = new Bullet();
			bullet.x = aircraft.x;
			bullet.y = aircraft.y - 50;
			bullets.push(bullet);
			game.addChild(bullet);
			lastBulletSpawn = LK.ticks;
		}
	}
	// Update and check bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove off-screen bullets
		if (bullet.lastY >= -50 && bullet.y < -50) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet collision with obstacles
		for (var j = obstacles.length - 1; j >= 0; j--) {
			var obstacle = obstacles[j];
			if (bullet.intersects(obstacle)) {
				// Destroy both bullet and obstacle
				LK.getSound('explosion').play();
				LK.setScore(LK.getScore() + 20);
				bullet.destroy();
				bullets.splice(i, 1);
				obstacle.destroy();
				obstacles.splice(j, 1);
				break;
			}
		}
		// Check bullet collision with fast obstacles
		for (var j = fastObstacles.length - 1; j >= 0; j--) {
			var fastObstacle = fastObstacles[j];
			if (bullet.intersects(fastObstacle)) {
				// Destroy both bullet and fast obstacle (worth more points)
				LK.getSound('explosion').play();
				LK.setScore(LK.getScore() + 30);
				bullet.destroy();
				bullets.splice(i, 1);
				fastObstacle.destroy();
				fastObstacles.splice(j, 1);
				break;
			}
		}
		bullet.lastY = bullet.y;
	}
	// Update and clean up trails
	for (var i = trails.length - 1; i >= 0; i--) {
		var trail = trails[i];
		if (trail.life <= 0) {
			trail.destroy();
			trails.splice(i, 1);
		}
	}
	// Update and clean up smoke particles
	for (var i = smokes.length - 1; i >= 0; i--) {
		var smoke = smokes[i];
		if (smoke.life <= 0) {
			smoke.destroy();
			smokes.splice(i, 1);
		}
	}
	// Update UI
	scoreText.setText('Distance: ' + Math.floor(distance));
	fuelText.setText('Fuel: ' + Math.floor(fuelLevel) + '%');
	// Update score based on distance
	LK.setScore(Math.floor(distance / 10));
};
// Start background music
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -52,15 +52,16 @@
 		if (self.x < 60) self.x = 60;
 		if (self.x > 1988) self.x = 1988;
 		if (self.y < 100) self.y = 100;
 		if (self.y > 2632) self.y = 2632;
-		// Create engine trail
-		if (LK.ticks % 5 == 0) {
-			var trail = new Trail();
-			trail.x = self.x - 40;
-			trail.y = self.y;
-			game.addChild(trail);
-			trails.push(trail);
+		// Create engine smoke trail
+		if (LK.ticks % 3 == 0) {
+			var smoke = new Smoke();
+			// Position smoke at aircraft engine (behind aircraft)
+			smoke.x = self.x + Math.sin(self.banking) * 30 - Math.cos(self.banking) * 50;
+			smoke.y = self.y - Math.sin(self.banking) * 50 + Math.cos(self.banking) * 30;
+			game.addChild(smoke);
+			smokes.push(smoke);
 		}
 	};
 	return self;
 });
@@ -159,8 +160,41 @@
 		self.y += self.speed;
 	};
 	return self;
 });
+var Smoke = Container.expand(function () {
+	var self = Container.call(this);
+	var smokeGraphics = self.attachAsset('smoke', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.life = 60;
+	self.maxLife = 60;
+	self.velocityX = (Math.random() - 0.5) * 2;
+	self.velocityY = Math.random() * 2 + 1;
+	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
+	self.initialScale = 0.3 + Math.random() * 0.4;
+	self.scaleX = self.initialScale;
+	self.scaleY = self.initialScale;
+	self.update = function () {
+		self.life--;
+		self.alpha = self.life / self.maxLife;
+		// Smoke expands as it ages
+		var ageRatio = 1 - self.life / self.maxLife;
+		var scale = self.initialScale + ageRatio * 1.5;
+		self.scaleX = scale;
+		self.scaleY = scale;
+		// Smoke drifts and rises
+		self.x += self.velocityX;
+		self.y += self.velocityY;
+		self.velocityY += 0.1; // Slight upward acceleration
+		smokeGraphics.rotation += self.rotationSpeed;
+		// Fade to lighter gray as it ages
+		var grayValue = Math.floor(0x88 + ageRatio * 0x44);
+		smokeGraphics.tint = grayValue << 16 | grayValue << 8 | grayValue;
+	};
+	return self;
+});
 var Trail = Container.expand(function () {
 	var self = Container.call(this);
 	var trailGraphics = self.attachAsset('trail', {
 		anchorX: 0.5,
@@ -197,8 +231,9 @@
 var fastObstacles = [];
 var fuels = [];
 var bonuses = [];
 var trails = [];
+var smokes = [];
 var bullets = [];
 var isShootingMode = false;
 var shootingEndTime = 0;
 var lastBulletSpawn = 0;
@@ -488,8 +523,16 @@
 			trail.destroy();
 			trails.splice(i, 1);
 		}
 	}
+	// Update and clean up smoke particles
+	for (var i = smokes.length - 1; i >= 0; i--) {
+		var smoke = smokes[i];
+		if (smoke.life <= 0) {
+			smoke.destroy();
+			smokes.splice(i, 1);
+		}
+	}
 	// Update UI
 	scoreText.setText('Distance: ' + Math.floor(distance));
 	fuelText.setText('Fuel: ' + Math.floor(fuelLevel) + '%');
 	// Update score based on distance