If you don't know how to play Number Place (a.k.a. Sudoku), look it up on Google.
UPDATE 2007-0314: It now builds puzzles that are guaranteed to be solvable -- or goes into an infinite loop! Enjoy!
And if you're a real smarty-pants, you can feel free to use this source package as a foundation for your own more intelligent program!
Mar 9 2007, 9:00 pm