Tap Tap Revenge 4 is a compact version of the classic Guitar Hero in which you use your fingers to play the three chords of each song. The app comes with 100 free songs to play along to, but you can buy many more from bands such as Blink-182, Bush, Coldplay, The Crystal Method, Dashboard Confessional, David Guetta, Depeche Mode, or Duran Duran, among others. Also, the game includes a chat function that allows you to chat with players from all over the world, anytime and anywhere. All you need is an Internet connection. Tap Tap Revenge 4 is one of the most fun and addictive free games on the Android catalog. It is absolutely indispensable if you like Guitar Hero or Rock Band.