You don't want to transport the game to the Xbox 360 every time you want to test it. You will create an XNA app this time. XNA devices have different screen sizes. The phones are in the usual sizes you also find on Android phones. The Xbox 360 is more like a PC. The optimal size for a game is recommended as 1280x720. But we can use sizes larger than regular sizes too. For our game, we will target a size of 800x600. That will be a good size to test our game. For this, we will change the HTML5 build files that are created by Monkey.