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

/**** 
* Classes
****/ 
var Coin = Container.expand(function () {
	var self = Container.call(this);
	self.coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.collected = false;
	// Floating animation
	self.animationOffset = Math.random() * Math.PI * 2;
	self.floatAmount = 20;
	self.update = function () {
		if (self.collected) {
			return;
		}
		self.x -= self.speed;
		// Floating animation
		self.y += Math.sin(LK.ticks * 0.1 + self.animationOffset) * 0.5;
		// Rotation animation
		self.rotation += 0.05;
		// Check collision with drone
		if (self.intersects(drone)) {
			self.collected = true;
			LK.setScore(LK.getScore() + 49);
			LK.getSound('score').play();
			scoreTxt.setText(LK.getScore());
			// Collection animation with tween
			tween(self, {
				scaleX: 2,
				scaleY: 2,
				alpha: 0
			}, {
				duration: 300,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					self.destroy();
				}
			});
			// Check if section should change
			updateGameSection();
		}
	};
	return self;
});
var Drone = Container.expand(function () {
	var self = Container.call(this);
	// Current drone graphics
	self.droneGraphics = null;
	self.velocity = 0;
	self.gravity = 1;
	self.jumpPower = -12;
	// Set drone type based on current section
	self.setDroneType = function (section) {
		if (self.droneGraphics) {
			self.removeChild(self.droneGraphics);
		}
		var droneType = 'natureDrone';
		if (section === 1) {
			droneType = 'militaryDrone';
		} else if (section === 2) {
			droneType = 'futuristicDrone';
		} else if (section === 3) {
			droneType = 'archeologicalDrone';
		}
		self.droneGraphics = self.attachAsset(droneType, {
			anchorX: 0.5,
			anchorY: 0.5
		});
	};
	self.flap = function () {
		self.velocity = self.jumpPower;
		LK.getSound('flap').play();
		// Flap animation
		tween(self, {
			rotation: -0.3
		}, {
			duration: 200
		});
		tween(self, {
			rotation: 0.3
		}, {
			duration: 300,
			onFinish: function onFinish() {
				tween(self, {
					rotation: 0
				}, {
					duration: 200
				});
			}
		});
	};
	self.update = function () {
		// Only apply physics if game has started
		if (gameStarted) {
			self.velocity += self.gravity;
			self.y += self.velocity;
			// Rotation based on velocity
			self.rotation = Math.min(Math.max(self.velocity * 0.05, -0.5), 0.8);
		}
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	self.topObstacle = null;
	self.bottomObstacle = null;
	self.gapHeight = 440;
	self.speed = 12;
	self.scored = false;
	self.createObstacle = function (section, gapY) {
		var obstacleType = 'treeObstacle';
		if (section === 1) {
			obstacleType = 'barbedWireObstacle';
		} else if (section === 2) {
			obstacleType = 'neonPoleObstacle';
		} else if (section === 3) {
			obstacleType = 'stoneColumnObstacle';
		}
		// Top obstacle
		self.topObstacle = self.attachAsset(obstacleType, {
			anchorX: 0.5,
			anchorY: 1
		});
		self.topObstacle.x = 0;
		self.topObstacle.y = gapY - self.gapHeight / 2;
		// Bottom obstacle
		self.bottomObstacle = self.attachAsset(obstacleType, {
			anchorX: 0.5,
			anchorY: 0
		});
		self.bottomObstacle.x = 0;
		self.bottomObstacle.y = gapY + self.gapHeight / 2;
	};
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb
});

/**** 
* Game Code
****/ 
// Sounds
// Background shapes for each section
// Obstacle assets for each section
// Drone assets for each section
// Game state variables
var gameStarted = false;
var gameSection = 0; // 0-3 for the four sections
var obstacles = [];
var coins = [];
var obstacleSpawnTimer = 0;
var backgroundGraphics = null;
// Create drone
var drone = game.addChild(new Drone());
drone.x = 400;
drone.y = 1366;
drone.velocity = 0; // Start with no velocity
// Create background
function updateBackground() {
	if (backgroundGraphics) {
		game.removeChild(backgroundGraphics);
	}
	var bgType = 'mountainBg';
	if (gameSection === 1) {
		bgType = 'battlefieldBg';
	} else if (gameSection === 2) {
		bgType = 'cyberpunkBg';
	} else if (gameSection === 3) {
		bgType = 'desertBg';
	}
	backgroundGraphics = LK.getAsset(bgType, {
		anchorX: 0,
		anchorY: 0,
		x: 0,
		y: 0
	});
	game.addChildAt(backgroundGraphics, 0);
}
// Initialize background and drone
updateBackground();
drone.setDroneType(gameSection);
// Create UI
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var startPrompt = new Text2('TAP TO START', {
	size: 80,
	fill: 0xFFFFFF
});
startPrompt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(startPrompt);
// Game section management
function updateGameSection() {
	var score = LK.getScore();
	var newSection = Math.floor(score / 50) % 4;
	if (newSection !== gameSection) {
		gameSection = newSection;
		updateBackground();
		drone.setDroneType(gameSection);
		// Increase difficulty slightly
		for (var i = 0; i < obstacles.length; i++) {
			obstacles[i].speed = 4 + Math.floor(score / 100) * 0.5;
		}
	}
}
// Obstacle spawning
function spawnObstacle() {
	var obstacle = new Obstacle();
	var gapY = 400 + Math.random() * (2732 - 800);
	obstacle.createObstacle(gameSection, gapY);
	obstacle.x = 2048 + 250;
	obstacle.speed = 4 + Math.floor(LK.getScore() / 100) * 0.5;
	obstacles.push(obstacle);
	game.addChild(obstacle);
	// Spawn coin in the gap
	var coin = new Coin();
	coin.x = obstacle.x;
	coin.y = gapY;
	coin.speed = obstacle.speed;
	coins.push(coin);
	game.addChild(coin);
}
// Input handling
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		startPrompt.visible = false;
		// Start with a flap to begin movement
		drone.flap();
		return;
	}
	drone.flap();
};
// Main game loop
game.update = function () {
	if (!gameStarted) {
		return;
	}
	// Check bounds collision
	if (drone.y < 0 || drone.y > 2732) {
		LK.getSound('crash').play();
		LK.showGameOver();
		return;
	}
	// Spawn obstacles
	obstacleSpawnTimer++;
	if (obstacleSpawnTimer >= 300) {
		// Spawn every 5 seconds at 60fps
		spawnObstacle();
		obstacleSpawnTimer = 0;
	}
	// Update and check obstacle collisions
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		// Check collision with drone
		if (drone.intersects(obstacle.topObstacle) || drone.intersects(obstacle.bottomObstacle)) {
			LK.getSound('crash').play();
			LK.showGameOver();
			return;
		}
		// Remove off-screen obstacles
		if (obstacle.x < -200) {
			obstacle.destroy();
			obstacles.splice(i, 1);
		}
	}
	// Update and cleanup coins
	for (var j = coins.length - 1; j >= 0; j--) {
		var coin = coins[j];
		// Remove off-screen or collected coins
		if (coin.x < -100 || coin.collected) {
			if (!coin.collected) {
				coin.destroy();
			}
			coins.splice(j, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -111,9 +111,9 @@
 var Obstacle = Container.expand(function () {
 	var self = Container.call(this);
 	self.topObstacle = null;
 	self.bottomObstacle = null;
-	self.gapHeight = 370;
+	self.gapHeight = 440;
 	self.speed = 12;
 	self.scored = false;
 	self.createObstacle = function (section, gapY) {
 		var obstacleType = 'treeObstacle';
@@ -154,13 +154,13 @@
 
 /**** 
 * Game Code
 ****/ 
-// Game state variables
-// Drone assets for each section
-// Obstacle assets for each section
-// Background shapes for each section
 // Sounds
+// Background shapes for each section
+// Obstacle assets for each section
+// Drone assets for each section
+// Game state variables
 var gameStarted = false;
 var gameSection = 0; // 0-3 for the four sections
 var obstacles = [];
 var coins = [];