Sudoku - Hard

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

Sudoku 4x4 - Hard

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

Large Print Sudoku Puzzles Red Book #5 (Hard) : Hard Sudoku Puzzle Book including Instructions and Answer Keys (Paperback)

Sudoku 4,774 hard, Life and style

Sudoku 5,995 hard, Life and style

Hard Sudoku Puzzle 50 Challenging Sudoku Puzzles To Solve 4*4 Sudoku Grid - (activity Books) 2nd Edition,large Print By William Liam (paperback) : Target

Looking for a mentally stimulating activity that's perfect for seniors? Our Hard Sudoku for Seniors Level 1 (9x9) is the perfect way to challenge your

Challenge Your Mind with Hard Sudoku for Seniors: Level 1 (9x9) with Solutions

Buy 1000+ Sudoku Puzzles for Adults: Medium to Hard Sudoku Puzzles with Detailed Step-by-step Solutions and Hints When You Get Stuck (Fun Adult

1000+ Sudoku Puzzles for Adults: Medium to Hard Sudoku Puzzles with Detailed Step-by-step Solutions and Hints When You Get Stuck (Fun Adult Activity

File:Sudoku puzzle hard for brute force.svg - Wikipedia

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

Sudoku 1,628 hard, Life and style

Hard Sudoku Puzzles – Free Printable

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

Sudoku 4038 hard, Life and style