Bruce Perkins a.k.a. EvilDooinz has jumped on the PSP-Sudoku bandwagon by coming up with and releasing a beta release of a Sudoku game of his very own for both 1.5 and 2.6-firmware PSPs.
As it stands right now, his includes only one puzzle and one theme.
Features of this Sudoku game include a clean GUI and easy controls. EvilDooinz has a 'todo' list for the game; future releases will feature more puzzles and themes; sounds, hints; time status; score system; and a high-score board as well.