Fun and accurate until level 4 where it is impossible to tap 16th notes. I mean you can tapp them but the iPhone wont recognize all 4 (maybe 2 or 3) only sometimes 4. The hardware will not recognize 4 tapp in the allotted time. So even if you know the rhythm, and tapp it correctly the iPhone hardware seems incapable of sensing it at this speed.
Dfktdd about Rhythm Taps