Essentially, you are making an app in the form of a game. The steps are complex, but doable. First, you will need a mobile game and application development kit. This can be found at app-making sites as well as by using animated application such as Adobe Flash CS5. Then you will need to do some simple software programming in order to develop your game. If you’d rather not build it from scratch, there are many app-making tools can be downloaded such as a program called GameSalad. Find out more about creating your own iPhone game by visiting the GameSalad FAQ page at: http://www.gamesalad.com/wiki/faqs.