Sunday, April 15, 2018

Are there published Sudoku puzzles that require guessing?


I believe in a number of books I have read and solved myself, the introduction stated that guessing should never be necessary for any of the puzzles in the book. Instead, a handful of techniques could be used to solve the puzzle completely, including the hard puzzles.



Are there published puzzles out there that do require guessing? Perhaps designed to challenge those who have "mastered" the more basic Sudoku puzzles?




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