Touch Pianist – Tap in Rhythm and Perform Your Favourite Music 11 years ago
If looking to turn this into something more educational, there could be a view of the proper piano score. You would have to follow the rhythm as written, and for each rhythmic value you got wrong, there would be some form of repercussion. It would still be very similar to Rock Band, but I think there would be more merit to reading the rhythm of written notes rather than just dots on a screen.
That being said, it is still an enjoyable app!