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Sudoku Snake will show you where all of your mistakes are.

  Have you gotten far in your sudoku puzzle and realized that you made a mistake but don't know where? You don't want to know what the correct answer is, and you don't want to start over either. The checking feature, then, is right for you. It will highlight all of the values you have entered incorrectly without showing you any of the right answers.

  In the example above the 7 and 3 highlighted in blue are incorrect.

Elders of Genova
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