A free app for Android, by Puppy Game Studio.
Music Saber: Video Game Under is an unofficial fan application. The app contains various songs from the game and its associated soundtrack. The songs are arranged in such a way that they can be played in a continuous loop.
How to play the app:
Swipe your finger to cut the beat and move left or right.. Listen to the beat of the music and use your finger to play the song. The more you move, the faster you will be able to play. Listen to the music and play as fast as you can.