อัปเดตเมื่อ Dec 12, 2015
version 3:
bug-fixes so it works in Android 4 devices!
version 2:
new Audio intervals tests.
Saves state, so you don't need to start from scratch every time.
vibrates when you make a mistake. I'd love to add electric shocks and whacks of the ruler, but can't seem to find those functions in my Android manual...
