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This game is considered a rhythm game kind of like Dance Dance Revolution where you dance to keep up with the beat/moves. With this game, you move or tap your fingers to keep up with the beat! There are a lot of famous artists to choose from like Lady Gaga, Coldplay, Katy Perry, LMFAO, Lil Wayne and Metallica.
Playing the game is fun but there is also the whole social aspect of it. You can chat and private message your buddies, customize your own avatar, have online battles against other players, win weekly contests and more.
This is a free game but it looks like a game that is worth a couple dollars. I think they must be able to keep it free because they get money for advertising the different artists on the game and because there are limited numbers of songs to play. They do have a new free track every week, so even if you have the free edition, there still is some nice variety.
Image Source: http://itunes.apple.com/us/app/tap-tap-revenge-4/id405373266?mt=8