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

I love using your Sudoku program. I have several others but yours is my favourite and I play at least one game with it every day. The others get used rarely.
John Hill, Australia
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