What does the "Not Solved" grade mean?

A. This grade means that Sudoku is not able to solve the puzzle without resorting to trial-and-error.

The "not solved" grade was added with version 3.6, released November 2010, in response to the increasing number of requests for even harder puzzles.

If you enable trial-and-error as a solving technique, Sudoku will still be able to solve puzzles of this grade, but there will be at least one number whose placement cannot be justified by a logical deduction - Sudoku made a guess in other words.

What People Say

Very nice program. Your programmers have taken the tedium out of finding correct solutions! By pure repetition, I have gained so many insights to solving the puzzles enjoyably! Now I solve over 20 sudoku puzzles in a short time due to the power of your software. Congratulations! Job well done. Hope you make a million on 4.0!
Frank Luebbert, USA
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