If you’re looking for to build a fun new multiplayer game, you may want to check out Come2Play. They have created an API for just that cause. Their API supports all types of multiplayer games, including real time and turn based.
Come2Play is offering a $1000-2000 sponsorship for multiplayer games made using their API, as well as allowing you to use CPMstar or MochiAds in your game. All you need to do to be considered is send them a pm on fgl stating your idea for a game. If they like it, they’ll try to work out a deal with you for the game. A contest is on the way soon, so check out their developers section to stay updated on the latest news.