Tag a Tune is a game created as part of a study by Carnegie Mellon University. You and an anonymous partner team up and listen to a song. You can only hear your tune and must type words that come to mind as the song plays. Then both you and your partner guess if you're listening to the same song or a different one based on the tags submitted. Not only is it a fun musical guessing game, you're also helping computers learn how to better search for music.

Flip Out is a straightforward, easy game to play. The objective is to flip over all of the white tiles within the time limit. If you do, a time bonus is awarded. You get to move on to the next level if you get at least 75% of the tiles before time expires. It's a simple idea of game done right, and it's fun and addictive, too.

From Carnegie Mellon University comes this multiplayer game that is simply called: The ESP Game. The game requires you to register and sign in, and then it pairs you up with an anonymous partner for a round of ten images. You have two minutes and thirty seconds (2:30) with which to agree...