RoboTone.

Hit the tones, beat the robo!
RoboTone is an application to strengthen absolute listening skill for your kids, especially grade school students.
They say, it's difficult to get the absolute listening skill after grown up, so try this app before you getting old.
First of all, play the piano as you like to listen and be familiar with the tones from this app.
Next, tap the battle button and do the battle.
Select the tone(s) you listen, press the answer to go!
You are correct, the robo's power deceases.
It's time to beat the robo!
To tap the setting button, you can change the tones number and instrument.