This is a Sudoku 9 by 9 Solver, not the player. If you want to play Sudoku puzzle, then you can find many sudoku.com sites from Google. The Sudoku player knows the answer first, then wipes out some numbers for you to play. The Sudoku solver doesn't know the answer, but it can figure out the puzzle.

The Sudoku 99 Solver can help you to find the solution for Sudoku game. It can solve the Evil Hard Sudoku puzzles provided by www.websudoku.com. That means this is a good tool for you, If you are doing the Sudoku contest.

Please don't abuse this tool by entering random numbers, which might cause a traffic jam for everybody. There is a little bit limitation for this web version of Sudoku 99 Solver.

• You must enter at least 15 numbers into the puzzle.

• The Sudoku 99 Solver will stop the calculation after 80 steps, which might be an invalid puzzle input

Please verify the numbers in the puzzle before clicking the Find Solution button.

Please report the error to mastertsai888@yahoo.com by providing the input puzzle. It's nice to send us the answer, if you know it.

To design and program the Sudoku solver is not that complicate. But it's not too easy, either. It's required a good mathematic background to design a perfect programming logic. If you are in school and want a good mathematics training, then visit www.concisemath.com to see how it guides our logic to the correct path.