EvilDooinz has released Rev 3 of his game Nanpure a.k.a Sudoku. A download is available for 1.5 firmware and another for 2.x firmware. We have browsed through the downloads but both of them didn't included a readme file.

Anyway here are the list of changelogs:
*controls
- Analog-stick controls the cursor
- R-Trigger and L-Triggers control the current value
- Square = Pen
- Triangle = Pencil
- Circle = Eraser
- Start = Pause(menu)
- Select = Undo

*limitations
- pencil and eraser aren't implemented yet

*to-do
- stats
- themes
- save/load game