Master Sudoku Puzzle

Many Sudoku puzzles are described as hard, challenging, fiendish. 99% are not that hard but these really are and require the Master SuDoku techniques to solve.
How to Play
Click on a possibility to choose that number for the square and the possibility will be removed from other squares in the row, column, and box. Hold down control, alt, or shift and click on a possibility to remove the possibility from the square, but not mark the square. To erase a wrong number from the square click on it and the possibilities will reappear. Check the Master SuDoku Hints page.
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