Sudoku - Hard

These hard sudoku puzzles have fewer clues than the others on the site and will require more advanced strategies to solve.

Extremely Difficult Sudoku Puzzles Book: Very Hard Sudoku for Advanced Players who Love a Challenging Game (Paperback)

13 Easy Ways to Solve Hard Sudoku Puzzles - wikiHow

A Hard Classic Sudoku for you to enjoy : r/sudoku

Sudoku 5,707 hard, Life and style

Sudoku 4038 hard, Life and style

Large Print Sudoku 12x12 - 100 Hard Puzzles: Vey Difficult Sudoku Variant - Different Style of Sudoku Puzzle Book for Adults (Large Print / Paperback)

Skyscraper Sudoku - Hard

Sudoku #1195 and #1196 (Hard) - Free Printable Puzzles

Buy Sudoku — Hard puzzles for print – Puzzle Sales

Hard Sudoku Puzzles and Solution: suduko puzzle books for adults difficult - Sudoku Hard Puzzles and Solution - Sudoku Puzzle Books for Adults & Senio (Large Print / Paperback)

Sudoku - Hard

Sudoku 6,130 hard, Life and style

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