Nice game! I've thought a lot about Sudoku (methods to solve it using AI, by logic and genetic algorithms and so on) but never actually tried to solve any. :-) So I didn't crack that one, I blame lack of sleep. I have only got one suggestion: If it is possible to name the button "Solve" instead of "Sol" I think you should do it, as it would like a tiny bit better.
Apart from that, great game!
Did you use any GUI components or did you draw it all yourself using primitives?
And another question. Do the puzzels only have one solution (as a "real" Sudoku should have), I completely understand if you are just shuffling random numbers in some way according to the game rules to generate your puzzles.
Yes, "Solve" is much more meaningful and the "components" are custom drawings.
You're very right, a "real" Sudoku must have only one solution. (I ignore it initially) It's a "difficult" point. I have modified the game to generate one-solution sudokus, however there are simple sudokus. Maybe the next weekend i'll think a bit more about it and i'll try to generate more difficult sudokus.
Thanks for the comments!