/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('enemy_dino', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.vx = -2;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Simple left-right movement
		self.x += self.vx;
	};
	return self;
});
// LevelGate class
var LevelGate = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('level_gate', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.active = false;
	return self;
});
// Initialize player
// Meteor class
var Meteor = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('meteor', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.vy = 8;
	self.lastY = 0;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.vy;
	};
	return self;
});
// Mushroom class
var Mushroom = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('mushroom', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.collected = false;
	return self;
});
// Platform class
var Platform = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('dino_player', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.vx = 0;
	self.vy = 0;
	self.isJumping = false;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Movement and gravity will be handled in game.update
		// Player position is updated in game.update, so nothing to do here
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Start menu overlay
var startMenuContainer = new Container();
var startBg = new Container();
var bgRect = LK.getAsset('platform', {
	anchorX: 0.5,
	anchorY: 0.5
});
bgRect.width = 900;
bgRect.height = 600;
bgRect.x = 2048 / 2;
bgRect.y = 2732 / 2;
bgRect.alpha = 0.92;
startBg.addChild(bgRect);
var startText = new Text2('Oyunu Başlat', {
	size: 160,
	fill: "#222"
});
startText.anchor.set(0.5, 0.5);
startText.x = 2048 / 2;
startText.y = 2732 / 2;
startMenuContainer.addChild(startBg);
startMenuContainer.addChild(startText);
LK.gui.center.addChild(startMenuContainer);
var gameStarted = false;
function startGame() {
	if (gameStarted) return;
	gameStarted = true;
	LK.gui.center.removeChild(startMenuContainer);
	// Play background music at game start
	LK.playMusic('musicId');
	// Global game objects and state
	player = new Player();
	player.x = 300;
	player.y = 2200;
	// Create a seamless row of platforms spanning the screen horizontally
	var platformAsset = LK.getAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var platformWidth = platformAsset.width;
	var yBase = 2300;
	for (var px = 0; px < 2048; px += platformWidth) {
		var plat = new Platform();
		plat.x = px + platformWidth / 2;
		plat.y = yBase;
		game.addChild(plat);
		platforms.push(plat);
	}
	// Add player after platforms so player is in front of platforms
	game.addChild(player);
	// Example mushrooms
	for (var i = 0; i < mushroomsToNextLevel; i++) {
		var mush = new Mushroom();
		mush.x = 400 + i * 150;
		mush.y = 2200 - i % 3 * 200;
		game.addChild(mush);
		mushrooms.push(mush);
	}
	// Example enemy
	var enemy1 = new Enemy();
	enemy1.x = 1200;
	enemy1.y = 2300;
	// Add enemy after player so enemy is in front of player
	game.addChild(enemy1);
	enemies.push(enemy1);
}
startMenuContainer.down = function (x, y, obj) {
	startGame();
};
var player = null;
var platforms = [];
var mushrooms = [];
var enemies = [];
var meteors = [];
var levelGate = null;
var score = 0;
var mushroomsToNextLevel = 10;
var canLevelUp = false;
// Example meteor (will be dropped randomly in game.update)
// Touch controls
var jumpQueued = false;
var isTouching = false;
game.down = function (x, y, obj) {
	isTouching = true;
	game.lastTouchX = x;
};
game.up = function (x, y, obj) {
	isTouching = false;
	game.lastTouchX = undefined;
};
// Swipe up to queue a jump
var swipeStartY = null;
game.down = function (x, y, obj) {
	isTouching = true;
	game.lastTouchX = x;
	swipeStartY = y;
};
game.up = function (x, y, obj) {
	isTouching = false;
	game.lastTouchX = undefined;
	if (typeof swipeStartY === "number" && swipeStartY - y > 80) {
		// Detected upward swipe
		jumpQueued = true;
	}
	swipeStartY = null;
};
game.update = function () {
	// Player movement
	var speed = 16;
	var gravity = 11; // Even more gravity for a snappier fall
	var jumpPower = -120; // Jump higher
	// Horizontal movement: move right if touch is on right half, left if on left half
	if (isTouching && typeof game.lastTouchX === "number" && player) {
		if (game.lastTouchX < 1024) {
			player.vx = -speed;
		} else {
			player.vx = speed;
		}
		player.x += player.vx;
	} else if (player) {
		player.vx = 0;
	}
	// Gravity
	if (player) {
		player.vy += gravity;
	}
	// Platform collision (pre-check for jump)
	var onPlatform = false;
	for (var i = 0; i < platforms.length; i++) {
		var plat = platforms[i];
		// Simple AABB check for landing on top
		if (player.y + 10 >= plat.y - plat.height / 2 && player.y + 10 <= plat.y + plat.height / 2 && player.x > plat.x - plat.width / 2 && player.x < plat.x + plat.width / 2 && player.vy >= 0) {
			onPlatform = true;
			break;
		}
	}
	// Ground collision (pre-check for jump)
	var onGround = false;
	if (player.y >= 2300) {
		onGround = true;
	}
	// Jump
	if (jumpQueued && !player.isJumping && (onPlatform || onGround)) {
		player.vy = jumpPower;
		player.isJumping = true;
		jumpQueued = false;
	}
	// Apply vertical movement
	player.y += player.vy;
	// Update player lastX/lastY for event logic
	player.update();
	// Platform collision
	var landed = false;
	for (var i = 0; i < platforms.length; i++) {
		var plat = platforms[i];
		// Simple AABB check for landing on top
		if (player.y + 10 >= plat.y - plat.height / 2 && player.y + 10 <= plat.y + plat.height / 2 && player.x > plat.x - plat.width / 2 && player.x < plat.x + plat.width / 2 && player.vy >= 0) {
			player.y = plat.y - plat.height / 2 - 10;
			player.vy = 0;
			if (player.isJumping) player.isJumping = false;
			landed = true;
		}
	}
	// Ground collision
	if (player.y > 2300) {
		player.y = 2300;
		player.vy = 0;
		if (player.isJumping) player.isJumping = false;
	}
	// Mushroom collection
	for (var i = 0; i < mushrooms.length; i++) {
		var mush = mushrooms[i];
		if (!mush.collected && player.intersects(mush)) {
			mush.collected = true;
			mush.visible = false;
			score += 1;
			if (score >= mushroomsToNextLevel) {
				canLevelUp = true;
				if (levelGate) levelGate.active = true;
			}
		}
	}
	// Enemy collision
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		enemy.update();
		if (player.intersects(enemy)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Meteor drop (randomly every 120 ticks)
	if (LK.ticks % 120 === 0) {
		var meteor = new Meteor();
		meteor.x = 400 + Math.floor(Math.random() * 1200);
		meteor.y = -100;
		game.addChild(meteor);
		meteors.push(meteor);
	}
	// Meteor update and collision
	for (var i = meteors.length - 1; i >= 0; i--) {
		var meteor = meteors[i];
		meteor.update();
		if (player.intersects(meteor)) {
			LK.getSound('warn').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
		if (meteor.y > 2800) {
			meteor.destroy();
			meteors.splice(i, 1);
		}
	}
	// Level gate logic
	if (!levelGate) {
		levelGate = new LevelGate();
		levelGate.x = 1800;
		levelGate.y = 1700;
		game.addChild(levelGate);
	}
	if (player.intersects(levelGate)) {
		if (canLevelUp) {
			LK.showYouWin();
		} else {
			// Play warning sound
			LK.getSound('warn').play();
		}
	}
};
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Update score display in game.update
var oldGameUpdate = game.update;
game.update = function () {
	scoreTxt.setText(score);
	oldGameUpdate();
};

===================================================================
--- original.js
+++ change.js
@@ -217,9 +217,11 @@
 	} else if (player) {
 		player.vx = 0;
 	}
 	// Gravity
-	player.vy += gravity;
+	if (player) {
+		player.vy += gravity;
+	}
 	// Platform collision (pre-check for jump)
 	var onPlatform = false;
 	for (var i = 0; i < platforms.length; i++) {
 		var plat = platforms[i];