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If you find that there is no single square highlighted in a box of
3 x 3 squares, then you either check the next digit until you find
another digit with a single highlighted square in a box of 3 x 3 or
you can try your own solution. |
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If you want to save the puzzle before making a choice of your own,
click on the Save Puzzle option and you you will be able to use the
Reload Puzzle to restore the puzzle with any squares you have already
completed at the time of saving and without subsequent changes |
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Or Click on Show All Choices to all legal options for each square |
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When you are ready Hide the Choices and continue |
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You can print out a grid with the choices for each square |