61 music notes! 25 sharp keys and 36 white keys! (Piano keys)
Keys are grouped by letter e.g. A2, A3, A4, A5, A6 etc and also grouped by number e.g. A3, B3, C3, D3, E3, F3, G3 etc.
All keys are hidden, click the Play button to play the note. To reveal the note press and hold the Play button.
To shuffle the order of notes simply press the Shuffle button.
Check it out at http://www.absolutepitchtraining.com