Are SadMan Sudoku puzzles minimal, in that deleting any single clue will cause it to have multiple solutions?

A. Not necessarily. Because SadMan Sudoku puzzles are symmetrical, it would be necessary to delete either two or four clues, to maintain the symmetry. Deleting any two or four clues would result in a puzzle with either multiple solutions, or that the in-built solver could not solve.

What People Say

Once again, thanks to the wonderful Sudoku software that you'd written. I continue to enjoy the game; as well, I also continue to encourage my friends to visit your website. Furthermore, I continue to test other Sudoku software; but I must admit, Sadman Sudoku wins me over, each and every time!
Alexander Hui, Canada
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