![]() Visit our Sudoku Difficulty Levels page for a definition of the categories we use for Sudoku difficulty. We determine difficulty by the logic techniques needed to solve the puzzle. To help you confidently select puzzles at the level you want, Puzzle Books Plus is committed to using a consistent grading standard for Sudoku books by Kat Andrews. Which do you think is more difficult, an evil, fiendish, extra-hard, devilish, black-belt, nasty, extreme or expert puzzle? For example, an easy puzzle in a book is often called moderate or hard in a newspaper, and categories are not precise. What is "easy" for one person can be a serious challenge for another.īecause there is no official Sudoku grading standard, you have no way to compare puzzles from different authors. If you were misled by other books with impossible Sudoku puzzles labeled “easy” or books with medium puzzles called “extreme," we feel your frustration. Sample these four popular difficulty levels to find the ones you prefer.
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