/**** 
* Classes
****/ 
var Block = Container.expand(function (board) {
	var self = Container.call(this);
	var hsvToRgb = function hsvToRgb(h, s, v) {
		var r, g, b;
		var i = Math.floor(h * 6);
		var f = h * 6 - i;
		var p = v * (1 - s);
		var q = v * (1 - f * s);
		var t = v * (1 - (1 - f) * s);
		switch (i % 6) {
			case 0:
				r = v, g = t, b = p;
				break;
			case 1:
				r = q, g = v, b = p;
				break;
			case 2:
				r = p, g = v, b = t;
				break;
			case 3:
				r = p, g = q, b = v;
				break;
			case 4:
				r = t, g = p, b = v;
				break;
			case 5:
				r = v, g = p, b = q;
				break;
		}
		return (Math.round(r * 255) << 16) + (Math.round(g * 255) << 8) + Math.round(b * 255);
	};
	var ShapeTypes = {
		SINGLE: [[1]],
		TRI: [[1, 1, 1]],
		QUAD: [[1, 1, 1, 1]],
		LSHAPE: [[1, 0, 0], [1, 0, 0], [1, 1, 1]],
		BLOCK: [[1, 1], [1, 1]],
		SMALLLSHAPE: [[1, 0], [1, 1]]
	};
	var shapes = Object.values(ShapeTypes);
	var offset = Math.floor(Math.random() * shapes.length);
	self.offset = offset;
	self.shape = shapes[offset];
	var hue = offset % shapes.length / shapes.length;
	self.color = hsvToRgb(hue, 0.6, 1);
	self.rotateShapeRandomly = function () {
		var rotations = Math.floor(Math.random() * 4);
		for (var r = 0; r < rotations; r++) {
			self.shape = self.shape[0].map(function (val, index) {
				return self.shape.map(function (row) {
					return row[index];
				}).reverse();
			});
		}
	};
	self.rotateShapeRandomly();
	self.blocks = [];
	var background = self.attachAsset('background', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	background.alpha = 0;
	var blockSize = 160;
	background.width = 4 * blockSize;
	background.height = 4 * blockSize;
	self.addChild(background);
	self.offsetX = 0;
	self.offsetY = 0;
	var blockOffsetX = (background.width / 2 - self.shape[0].length * blockSize) / 2 - blockSize / 2;
	var blockOffsetY = (background.height / 2 - self.shape.length * blockSize) / 2 - blockSize / 2;
	for (var i = 0; i < self.shape.length; i++) {
		for (var j = 0; j < self.shape[i].length; j++) {
			if (self.shape[i][j] === 1) {
				var block = self.createAsset('block_' + offset, {
					anchorX: 0.5,
					anchorY: 0.5
				});
				block.x = j * blockSize + blockOffsetX;
				block.y = i * blockSize + blockOffsetY;
				self.blocks.push(block);
				self.addChild(block);
			}
		}
	}
	self.startX = 0;
	self.startY = 0;
	self.moveTowardsHomePosition = function () {
		var dx = self.startX - self.x;
		var dy = self.startY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 1) {
			self.x += dx * 0.3;
			self.y += dy * 0.3;
		} else {
			self.x = self.startX;
			self.y = self.startY;
		}
	};
	var currentX = 0;
	var currentY = 0;
	self.moveToDragTarget = function () {
		var ox = -this.targetX;
		var oy = (LK.is.mobile ? 400 : 0) - this.targetY;
		this.targetX += ox / 5;
		this.targetY += oy / 5;
		this.x = currentX - this.targetX;
		this.y = currentY - this.targetY;
	};
	self._move_migrated = function (x, y) {
		currentX = x;
		currentY = y;
		self.x = x - this.targetX;
		self.y = y - this.targetY;
	};
	self.setStartPosition = function (x, y) {
		self.startX = x;
		self.startY = y;
	};
	self.getOverlappingCells = function () {
		var cells = [];
		var boardPos = {
			x: -board.x + self.x + 160 * 4 + blockOffsetX + 160,
			y: -board.y + self.y + 160 * 4 + blockOffsetY + 160
		};
		var startX = Math.floor(boardPos.x / 160);
		var startY = Math.floor(boardPos.y / 160);
		for (var i = 0; i < self.shape.length; i++) {
			for (var j = 0; j < self.shape[i].length; j++) {
				if (self.shape[i][j] === 1) {
					var cell = board.grid && board.grid[startY + i] && board.grid[startY + i][startX + j];
					if (cell && !cell.filled) {
						cells.push(cell);
					} else {
						return null;
					}
				}
			}
		}
		return cells;
	};
	self.showOverlap = function () {
		var cells = self.getOverlappingCells();
		if (cells) {
			for (var a = 0; a < cells.length; a++) {
				var cell = cells[a];
				cell.setTint(self.color);
			}
		}
	};
	self.rotateShapeRandomly = function () {
		var rotations = Math.floor(Math.random() * 4);
		for (var r = 0; r < rotations; r++) {
			self.shape = self.shape[0].map(function (val, index) {
				return self.shape.map(function (row) {
					return row[index];
				}).reverse();
			});
		}
	};
});
var Board = Container.expand(function () {
	var self = Container.call(this);
	self.particles = [];
	Board.prototype.spawnParticles = function (x, y, tint) {
		for (var i = 0; i < 10; i++) {
			var particle = new Particle(tint);
			particle.x = x;
			particle.y = y;
			this.particles.push(particle);
			this.addChild(particle);
		}
	};
	self.grid = new Array(10).fill(null).map(function () {
		return new Array(10).fill(null);
	});
	var size = 158;
	var totalWidth = 10 * size;
	var totalHeight = 10 * size;
	for (var i = 0; i < 10; i++) {
		for (var j = 0; j < 10; j++) {
			var cell = new Cell();
			cell.x = i * size - totalWidth / 2 + size / 2;
			cell.y = j * size - totalHeight / 2 + size / 2;
			self.grid[j][i] = cell;
			self.addChild(cell);
		}
	}
	self.removeTint = function () {
		for (var i = 0; i < 10; i++) {
			for (var j = 0; j < 10; j++) {
				if (!self.grid[i][j].filled) {
					self.grid[i][j].setTint(0xffffff);
				}
			}
		}
	};
	self.checkLines = function () {
		var rowsRemoved = 0;
		for (var i = 0; i < 10; i++) {
			var rowFilled = true;
			var colFilled = true;
			for (var j = 0; j < 10; j++) {
				if (!self.grid[i][j].filled) {
					rowFilled = false;
				}
				if (!self.grid[j][i].filled) {
					colFilled = false;
				}
			}
			if (rowFilled || colFilled) {
				rowsRemoved += (rowFilled ? 1 : 0) + (colFilled ? 1 : 0);
				for (var j = 0; j < 10; j++) {
					if (rowFilled) {
						self.grid[i][j].setFill(false);
						self.spawnParticles(self.grid[i][j].x, self.grid[i][j].y, self.grid[i][j].getTint());
					}
					if (colFilled) {
						self.grid[j][i].setFill(false);
						self.spawnParticles(self.grid[j][i].x, self.grid[j][i].y, self.grid[j][i].getTint());
					}
				}
			}
		}
		return rowsRemoved;
	};
	self.tick = function () {
		for (var i = self.particles.length - 1; i >= 0; i--) {
			var particle = self.particles[i];
			if (particle) {
				particle.tick();
				if (particle.alpha <= 0) {
					self.particles.splice(i, 1);
				}
			}
		}
		for (var i = 0; i < 10; i++) {
			for (var j = 0; j < 10; j++) {
				self.grid[i][j].tick(i, j);
			}
		}
	};
	self.placeBlock = function () {};
});
var Cell = Container.expand(function () {
	var self = Container.call(this);
	self.filled = false;
	var yOffsetArray = [-25, -10, -20, -25, -25, -20];
	var empty = self.attachAsset('cell', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	empty.alpa = .8;
	var filled;
	var currentOffset;
	empty.y = 2;
	self.currentTint = 0xffffff;
	self.setFill = function (isFilled, asset, offset) {
		self.filled = isFilled;
		empty.visible = !self.filled;
		if (isFilled) {
			if (asset) {
				asset.x = 0;
				asset.y = yOffsetArray[offset] || -15;
				currentOffset = offset;
				self.addChild(asset);
				filled = asset;
			}
		} else {
			if (filled) {
				filled.destroy();
				filled = null;
			}
		}
	};
	self.tick = function (i, j) {
		if (filled) {
			var offset = Math.cos(((i + j) * 3 + LK.ticks / 2) / 6) / 20;
			var ty = yOffsetArray[currentOffset] || -15;
			filled.y = ty + Math.abs(offset * 200) - 5;
			filled.rotation = offset;
		}
	};
	self.getTint = function () {
		return self.currentTint;
	};
	self.setTint = function (tint) {
		self.currentTint = tint;
		empty.tint = tint;
	};
	self.setFill(false);
});
var Particle = Container.expand(function (tint) {
	var self = Container.call(this);
	self.tint = tint;
	var particleGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	particleGraphics.rotation = Math.random() * Math.PI * 2;
	particleGraphics.tint = self.tint;
	self.vx = Math.random() * 4 - 2;
	self.vy = Math.random() * 4 - 2;
	self.alpha = 1;
	self.lifetime = 60;
	self.tick = function () {
		self.x += self.vx;
		self.y += self.vy;
		self.alpha -= 1 / self.lifetime;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});

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

/**** 
* Game Code
****/ 
// Main menu overlay
var mainMenuOverlay = new Container();
mainMenuOverlay.zIndex = 10000; // ensure on top
// Semi-transparent background
var menuBg = LK.getAsset('tileBackground', {
	anchorX: 0.5,
	anchorY: 0.5
});
// Make sure the background fully covers the screen
menuBg.width = 2048;
menuBg.height = 2732;
menuBg.x = 2048 / 2;
menuBg.y = 2732 / 2;
menuBg.alpha = 0.85;
mainMenuOverlay.addChild(menuBg);
// Title text
var titleText = new Text2('DENOŞ BLOK OYUNU', {
	size: 180,
	fill: 0xD83318,
	font: 'Impact',
	stroke: '#fff',
	strokeThickness: 18
});
titleText.anchor.set(0.5, 0.5);
titleText.x = 2048 / 2;
titleText.y = 900;
mainMenuOverlay.addChild(titleText);
// Play button
var playBtnBg = LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5
});
playBtnBg.width = 600;
playBtnBg.height = 220;
playBtnBg.tint = 0x83de44;
playBtnBg.x = 2048 / 2;
playBtnBg.y = 1500;
mainMenuOverlay.addChild(playBtnBg);
var playBtnText = new Text2('Oyna', {
	size: 120,
	fill: "#fff",
	font: 'Impact',
	stroke: '#2a636e',
	strokeThickness: 10
});
playBtnText.anchor.set(0.5, 0.5);
playBtnText.x = 2048 / 2;
playBtnText.y = 1500;
mainMenuOverlay.addChild(playBtnText);
// Block gameplay until play is pressed
var gameStarted = false;
game.addChild(mainMenuOverlay);
function startGame() {
	if (gameStarted) {
		return;
	}
	gameStarted = true;
	mainMenuOverlay.visible = false;
	// --- original game setup code below ---
	gameBackground = game.attachAsset('gameBackground', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	gameBackground.x = 2048 / 2;
	gameBackground.y = 2732 / 2 + 65;
	blocks = [];
	dragTarget = undefined;
	board = game.addChild(new Board());
	board.x = 2048 / 2;
	board.y = 2732 / 2 - 250 + 30;
	targetOffset = undefined;
	game.createBlock = function (index) {
		var block = new Block(board);
		block.x = 2048 / 2 + (index - 1) * (block.width + 30);
		block.y = 2732 + block.height;
		block.setStartPosition(block.x, 2732 - block.height / 2 - 30);
		blocks.push(block);
		game.addChild(block);
		block.on('down', function (x, y, obj) {
			dragTarget = this;
			var pos = this.toLocal(obj.global);
			var targetPos = game.toLocal(obj.global);
			this.targetX = pos.x;
			this.targetY = pos.y;
			dragTarget._move_migrated(targetPos.x, targetPos.y);
		});
	};
	game.on('move', function (x, y, obj) {
		if (dragTarget) {
			board.removeTint();
			var pos = game.toLocal(obj.global);
			dragTarget._move_migrated(pos.x, pos.y);
			dragTarget.showOverlap();
		}
	});
	game.on('up', function (x, y, obj) {
		if (dragTarget) {
			var cells = dragTarget.getOverlappingCells();
			if (cells) {
				for (var a = 0; a < cells.length; a++) {
					cells[a].setFill(true, dragTarget.blocks[a], dragTarget.offset);
					cells[a].setTint(dragTarget.color);
				}
				blocks[blocks.indexOf(dragTarget)] = undefined;
				dragTarget.destroy();
				if (!blocks.some(function (block) {
					return block;
				})) {
					game.createBlocks();
				}
				var pointsToAdd = board.checkLines();
				if (pointsToAdd) {
					score += Math.pow(pointsToAdd, 2) * 10;
					LK.setScore(score);
					scoreTxt.setText(score);
				}
			}
			board.removeTint();
			dragTarget = undefined;
		}
	});
	game.createBlocks = function () {
		for (var i = 0; i < 3; i++) {
			game.createBlock(i);
		}
	};
	score = 0;
	game.createBlocks();
	scoreTxt = new Text2('0', {
		size: 150,
		fill: 0xFFFFFF,
		font: 'Impact',
		stroke: '#2a636e',
		strokeThickness: 16
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.top.addChild(scoreTxt);
	// --- Add Asset-based Back Button ---
	var backBtnAsset = LK.getAsset('back', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	backBtnAsset.width = 180;
	backBtnAsset.height = 180;
	backBtnAsset.x = 2048 - 180;
	backBtnAsset.y = 120;
	backBtnAsset.zIndex = 10001;
	backBtnAsset.interactive = true;
	backBtnAsset.buttonMode = true;
	backBtnAsset.visible = false;
	backBtnAsset.on('down', function (x, y, obj) {
		// Hide game UI and show main menu
		mainMenuOverlay.visible = true;
		gameStarted = false;
		// Remove all blocks and board from game
		if (typeof board !== "undefined" && board) {
			board.destroy();
			board = undefined;
		}
		if (typeof blocks !== "undefined" && blocks) {
			for (var i = 0; i < blocks.length; i++) {
				if (blocks[i]) {
					blocks[i].destroy();
				}
			}
			blocks = [];
		}
		if (typeof gameBackground !== "undefined" && gameBackground) {
			gameBackground.destroy();
			gameBackground = undefined;
		}
		if (typeof scoreTxt !== "undefined" && scoreTxt) {
			scoreTxt.setText("0");
		}
		// Hide back button
		backBtnAsset.visible = false;
	});
	LK.gui.top.addChild(backBtnAsset);
	// Show back button only when game is started
	LK.on('tick', function () {
		if (typeof backBtnAsset !== "undefined") {
			backBtnAsset.visible = !!gameStarted;
		}
	});
	game.isMovePossible = function () {
		for (var a = 0; a < blocks.length; a++) {
			if (blocks[a]) {
				for (var i = 0; i < 10; i++) {
					for (var j = 0; j < 10; j++) {
						if (board.grid[i][j].filled) {
							continue;
						}
						var canPlace = true;
						for (var k = 0; k < blocks[a].shape.length; k++) {
							for (var l = 0; l < blocks[a].shape[k].length; l++) {
								if (blocks[a].shape[k][l] === 1) {
									if (i + k < 0 || i + k >= 10 || j + l < 0 || j + l >= 10 || board.grid[i + k][j + l].filled) {
										canPlace = false;
										break;
									}
								}
							}
							if (!canPlace) {
								break;
							}
						}
						if (canPlace) {
							return true;
						}
					}
				}
			}
		}
		return false;
	};
	var isGameOver = false;
	LK.on('tick', function () {
		if (typeof board !== "undefined" && board && typeof board.tick === "function") {
			board.tick();
		}
		if (isGameOver || !game.isMovePossible()) {
			LK.effects.flashScreen(0xffffff, 1000);
			LK.showGameOver();
			isGameOver = true;
		}
		for (var a = blocks.length - 1; a >= 0; a--) {
			if (blocks[a]) {
				if (blocks[a] != dragTarget) {
					blocks[a].moveTowardsHomePosition();
				} else {
					blocks[a].moveToDragTarget();
				}
			}
		}
	});
}
// Play button interaction
playBtnBg.interactive = true;
playBtnBg.buttonMode = true;
playBtnBg.on('down', function () {
	startGame();
});
playBtnText.interactive = true;
playBtnText.buttonMode = true;
playBtnText.on('down', function () {
	startGame();
});

===================================================================
--- original.js
+++ change.js
@@ -461,34 +461,22 @@
 		strokeThickness: 16
 	});
 	scoreTxt.anchor.set(.5, 0);
 	LK.gui.top.addChild(scoreTxt);
-	// --- Add Back Button --- 
-	var backBtnBg = LK.getAsset('background', {
+	// --- Add Asset-based Back Button ---
+	var backBtnAsset = LK.getAsset('back', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	backBtnBg.width = 320;
-	backBtnBg.height = 120;
-	backBtnBg.tint = 0xd83318;
-	backBtnBg.x = 2048 - 220;
-	backBtnBg.y = 120;
-	backBtnBg.zIndex = 10001;
-	var backBtnText = new Text2('Geri', {
-		size: 70,
-		fill: "#fff",
-		font: 'Impact',
-		stroke: '#2a636e',
-		strokeThickness: 8
-	});
-	backBtnText.anchor.set(0.5, 0.5);
-	backBtnText.x = backBtnBg.x;
-	backBtnText.y = backBtnBg.y;
-	backBtnText.zIndex = 10002;
-	// Make back button interactive for finger/touch
-	backBtnBg.interactive = true;
-	backBtnBg.buttonMode = true;
-	backBtnBg.on('down', function (x, y, obj) {
+	backBtnAsset.width = 180;
+	backBtnAsset.height = 180;
+	backBtnAsset.x = 2048 - 180;
+	backBtnAsset.y = 120;
+	backBtnAsset.zIndex = 10001;
+	backBtnAsset.interactive = true;
+	backBtnAsset.buttonMode = true;
+	backBtnAsset.visible = false;
+	backBtnAsset.on('down', function (x, y, obj) {
 		// Hide game UI and show main menu
 		mainMenuOverlay.visible = true;
 		gameStarted = false;
 		// Remove all blocks and board from game
@@ -511,27 +499,16 @@
 		if (typeof scoreTxt !== "undefined" && scoreTxt) {
 			scoreTxt.setText("0");
 		}
 		// Hide back button
-		backBtnBg.visible = false;
-		backBtnText.visible = false;
+		backBtnAsset.visible = false;
 	});
-	backBtnText.interactive = true;
-	backBtnText.buttonMode = true;
-	backBtnText.on('down', function (x, y, obj) {
-		backBtnBg.emit('down', x, y, obj);
-	});
-	// Add to GUI overlay so it stays on top
-	LK.gui.top.addChild(backBtnBg);
-	LK.gui.top.addChild(backBtnText);
+	LK.gui.top.addChild(backBtnAsset);
 	// Show back button only when game is started
 	LK.on('tick', function () {
-		if (typeof backBtnBg !== "undefined") {
-			backBtnBg.visible = !!gameStarted;
+		if (typeof backBtnAsset !== "undefined") {
+			backBtnAsset.visible = !!gameStarted;
 		}
-		if (typeof backBtnText !== "undefined") {
-			backBtnText.visible = !!gameStarted;
-		}
 	});
 	game.isMovePossible = function () {
 		for (var a = 0; a < blocks.length; a++) {
 			if (blocks[a]) {