I've been planning on portablizing a small, fun game for inclusion in the Portable Apps Suite for a while now. And it hit me while playing Brain Age's Sudoku puzzles on my Nintendo DS the other day... why not Sudoku? Well, after searching through all the open source implementations, one seemed pretty solid. So, we now have Sudoku Portable. It's under 400k installed. Very fast. Has 4 modes of difficulty (Easy, Medium, Hard and Impossible). Allows you to enter possible solutions by holding the shift key down (only the regular numbers, not the numeric keypad). And it automatically saves your game between sessions. It's also got all the other features of the new apps including in-place upgrade support, Live CD compatibility (no changes needed after running it once), works on Windows 95 and up, and is even mostly compatible with Wine (it just won't save your game or settings when you exit).
Get the self-extractor here:
As usual, please don't share this outside the forums (it's hosted here for now) and please drop a note back with your testing results and thoughts.