When iOS SDK was released to the public, because of the nature of hardware and software used in iOS devices, developers immediately recognized the amazing power in these devices and started to write games for the iPhone and now for the iPad. Developers had to write custom code to manage gamers? scores, manage leaderboards, initiate multiplayer games and etc. With the introduction of Game Center, a framework built into the iOS SDK, developer can take advantage of all the features of Game Center built into the core of iOS SDK. Features such as: leaderboards, user authentication, achievements, multiplayer games and etc. Game Center is a quite new framework to iOS.