Hi! I doubt I'll get anywhere with this or win anything, but this is my piano application. It can play 5 octaves of notes (61) and can be used on the go for piano playing. Just entering for fun!

The controls are as follows:

Down - C
Left - D
Up - E
Right - F
B - G
Y - A
X - B
A - High C

Holding L while playing a note plays the flat of that note
Holding R while playing a note plays the sharp of that note
Holding L and pressing R moves the octave up by one
Holding R and pressing L moves the octave down by one

Pressing on the octave buttons automatically moves you to an octave

Pressing Start lowers the octave by one
Pressing Select increases the octave by one

Tilting a DS Motion card left will lower the octave by one
Tilting a DS Motion card right will increase the octave by one