Does any one have experience in programming sudoku? I need a sudoku generator not a solver.

What I have in mind is the following:

1. Make a 9x9 grid
2. fill in the grid
3. remove x numbers from the grid

The problem is really at the third step. How can I remove numbers while the puzzle is still solvable (with human logic)?

Hi lhy, I really liked to discuss with u on this, but I have been quite busy lately.  Hopefully it will be over by the end of May.

I have once thought about write some codes to generate sudoku puzzles since my girl loves sudoku.  I have googled it and found some people talking about it.  Apparently they already have some algorithms to do it so we don't have to start from scratch.  But I did not have time to dig into it.

Thanks for starting this thread.  Just like to let you know that I am interested!  Hopefully others are too, and will start some discussions!    I will join in later when I have more time!