var Cell = Container.expand(function () {
	var self = Container.call(this);
	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);
	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();
				cell.x = x * cellGraphics.width;
				cell.y = y * cellGraphics.height;
				self.addChild(cell);
				self.cells[x][y] = cell;
			}
		}
	};
	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];
		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();
	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);
		board.revealCell(cellX, cellY);
		if (board.cells[cellX][cellY].isMine) {
			gameOver = true;
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
	LK.on('tick', function () {
		if (gameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -3,20 +3,83 @@
 	var cellGraphics = self.createAsset('cell', 'Cell Graphics', .5, .5);
 	self.isMine = false;
 	self.isRevealed = false;
 	self.neighborMines = 0;
-	self.reveal = function () {};
-	self.placeMine = function () {};
-	self.calculateNeighborMines = function () {};
+	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);
 	var boardGraphics = self.createAsset('board', 'Board Graphics', .5, .5);
 	self.cells = [];
-	self.generateBoard = function () {};
-	self.revealCell = function (x, y) {};
-	self.placeMines = function () {};
-	self.calculateAllNeighborMines = function () {};
+	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();
+				cell.x = x * cellGraphics.width;
+				cell.y = y * cellGraphics.height;
+				self.addChild(cell);
+				self.cells[x][y] = cell;
+			}
+		}
+	};
+	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];
+		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());