Jacob Collier's 2:3:4:5:6 Polyrhythm on one hand  

I recently tried out a game inspired by Jacob Collier, where you keep a 2:3:4:5:6 rhythm with one hand. There are several other patterns, which seem to make for a good practice.
This is the game called "Polyrhythm," which you can find at unityroom.com/....