As you've gone through the book, I've slowly been contributing toward your Lunar Lander game where it has made sense. I haven't completed it, though, and this is deliberate. Where would be the fun in providing you with the finished game?! The knowledge you've gained through the book in iOS, its SDK, and Xcode will allow you to complete the game and publish it—or you may want to start a completely different game.
However, it wouldn't be fair to leave you hanging, so in this appendix I discuss some of the elements you may want to consider adding to the game. The source code associated with the book includes code fragments that complement this chapter to help you complete your game.