Game Center brings social gaming to OS X and iOS apps. With the Game Center app, you can play against friends and unknown foes anywhere in the world. Invite someone to join, then get a game going. Or go up against people you don't know, from anywhere in the world, in a multiplayer game.
tags: achievements gamecenter games highscores pvpGrantoo makes a multiplayer platform for mobile games allowing players to compete with their friends online.
tags: engagement gamecenter games leaderboards monetization