Polyrhythm
Tap two different rhythms at once, one for each hand. Practise one hand at a time, then put 3 against 2 or 4 against 3 together.
Press Start. Try each hand separately, then bring them together.
Adjust tap timing (now 0 ms)
Your screen or speakers may add a small delay, so perfect taps can look late. Tap along six times and the average delay is taken off your score (1 ms is a thousandth of a second).
No sound? Turn off silent mode and raise the volume. Lights also show the beats.
How to play
Press Start to hear a four-beat loop repeat four times. Tap the big button on the side that lights up, in time with the light. On a keyboard, F is left and J is right. First set Practice to Left only or Right only, then try Both hands. "3 : 2" means 3 taps with the left hand and 2 with the right in each loop.