Sudoku logic-based puzzles have been a huge success. Many magazines offer their readers sudoku puzzles. The rules of sudoku are very simple but the completion of the puzzle may take even few hours.
The computer program My SUDOKU, designed in SudokuPolska.com, enables building exciting sudoku puzzles of several difficulty levels. You can solve each puzzle yourself, using tips. My SUDOKU may also solve the puzzle on the Users request. You can also take part in numerous sudoku competitions, since the program shall certainly find the proper solution.
More information from program website