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

It's a wonderful Sudoku program! I like it because I deliver Sudoku puzzles to newspaper in Copenhagen and North Zealand and it does a lot of work for me. It's just wonderful. Instead of calling it sadman.... you should call it happyman....
Douglas Fullerton, Denmark.
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