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- Click or use arrows to move between boxes.
- Pencil marks are made by typing in #'s into the boxes. To clear a pencil mark, retype the #.
- Pen marks are made by holding the shift or control key down and entering a #. If the # is incorrect, it will light up red within a minute.
- Your opponents board is located below. Green squares indicate a correct move, Red indicate an incorrect move.
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This game is written using AJAX technology.
Sudoku Challenge is a trademark of RustyBrick, Inc.