var Cell = Container.expand(function () {
	var self = Container.call(this);
	self.setPosition = function (x, y) {
		self.x = x * self.width;
		self.y = y * self.height;
	};
	var cellGraphics = self.createAsset('cell', 'Cell Graphics', .5, .5);
	self.isMine = false;
	self.isRevealed = false;
	self.neighborMines = 0;
	self.reveal = function () {
		if (self.isRevealed) return;
		self.isRevealed = true;
		if (self.isMine) {
			cellGraphics.setTexture('mine');
		} else {
			cellGraphics.setTexture('number_' + self.neighborMines);
		}
	};
	self.placeMine = function () {
		self.isMine = true;
	};
	self.calculateNeighborMines = function (getNeighbor) {
		self.neighborMines = 0;
		var neighbors = getNeighbor(self.x, self.y);
		for (var i = 0; i < neighbors.length; i++) {
			if (neighbors[i].isMine) {
				self.neighborMines++;
			}
		}
	};
});
var Board = Container.expand(function () {
	var self = Container.call(this);
	self.revealAllMines = function () {
		for (var x = 0; x < self.cells.length; x++) {
			for (var y = 0; y < self.cells[x].length; y++) {
				var cell = self.cells[x][y];
				if (cell.isMine) {
					cell.reveal();
				}
			}
		}
	};
	var boardGraphics = self.createAsset('board', 'Board Graphics', .5, .5);
	self.cells = [];
	self.generateBoard = function (width, height) {
		for (var x = 0; x < width; x++) {
			self.cells[x] = [];
			for (var y = 0; y < height; y++) {
				var cell = new Cell();
				self.addChild(cell);
				self.cells[x][y] = cell;
				cell.setPosition(x, y);
			}
		}
	};
	self.revealCell = function (x, y) {
		if (x < 0 || x >= self.cells.length || y < 0 || y >= self.cells[x].length) return;
		var cell = self.cells[x][y];
		if (!cell.isRevealed) {
			cell.reveal();
			return cell.isMine;
		}
	};
	self.placeMines = function (mineCount) {
		var placedMines = 0;
		while (placedMines < mineCount) {
			var x = Math.floor(Math.random() * self.cells.length);
			var y = Math.floor(Math.random() * self.cells[x].length);
			if (!self.cells[x][y].isMine) {
				self.cells[x][y].placeMine();
				placedMines++;
			}
		}
	};
	self.calculateAllNeighborMines = function () {
		var getNeighbor = function (x, y) {
			var neighbors = [];
			for (var dx = -1; dx <= 1; dx++) {
				for (var dy = -1; dy <= 1; dy++) {
					if (dx === 0 && dy === 0) continue;
					var nx = x + dx, ny = y + dy;
					if (nx >= 0 && nx < self.cells.length && ny >= 0 && ny < self.cells[nx].length) {
						neighbors.push(self.cells[nx][ny]);
					}
				}
			}
			return neighbors;
		};
		for (var x = 0; x < self.cells.length; x++) {
			for (var y = 0; y < self.cells[x].length; y++) {
				self.cells[x][y].calculateNeighborMines(getNeighbor);
			}
		}
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var board = self.addChild(new Board());
	var gameOver = false;
	board.generateBoard(10, 10);
	board.placeMines();
	board.calculateAllNeighborMines();
	self.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		var cell = new Cell();
		var cellX = Math.floor(pos.x / cell.width);
		var cellY = Math.floor(pos.y / cell.height);
		board.revealCell(cellX, cellY);
		if (board.cells[cellX][cellY].isMine) {
			gameOver = true;
			board.revealAllMines();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -103,10 +103,11 @@
 	board.placeMines();
 	board.calculateAllNeighborMines();
 	self.on('down', function (obj) {
 		var pos = obj.event.getLocalPosition(self);
-		var cellX = Math.floor(pos.x / cellGraphics.width);
-		var cellY = Math.floor(pos.y / cellGraphics.height);
+		var cell = new Cell();
+		var cellX = Math.floor(pos.x / cell.width);
+		var cellY = Math.floor(pos.y / cell.height);
 		board.revealCell(cellX, cellY);
 		if (board.cells[cellX][cellY].isMine) {
 			gameOver = true;
 			board.revealAllMines();