Build an iOS Game

I'm looking for a Freelancer to help me build an iOS game featuring elements of the classic arcade genre. The game should include user profiles so that players can save their progress, and can eventually be integrated with other services such as Game Center if necessary. Above all else, the game should be as entertaining as possible and make engaging use of the different puzzle, racing, and arcade elements.

Other key features include:

- search and add friends
- cooperative play with a friend (2 player)
- chat with users on the friends list
- in-app purchase