The time when arcade regulars entered their initials when the game was over has gone. Today, almost every game has an online mode and today's players are not satisfied with just playing games; they like to share their achievements, compare trophies, challenge other players, and play with their friends.

Game Center is a network service provided by Apple to support interaction between gamers in a variety of ways such as storing scores and leaderboards, managing achievements, or multiplayer games.

Game Kit is the framework needed to make Game Center features available in your games, but you will need to perform some previous steps before coding, for example, your app should be configured in iTunes Connect to enable Game Center.