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Pages: 103, Paperback, Independently published
Independently Published
1000+ Hard Sudoku Puzzles: The Ultimate Challenge Puzzle Book for Experts: 9x9
Hard Sudoku Challenge: 36 Expert Puzzles for Advanced Solvers
Sudoku Puzzles Hard: Advanced Fun: 200 Tough for Puzzle Masters, 6x9in, Challenge Your Brain
Impossible Sudoku for Experts: 200 Very Hard Logic Puzzles Experienced Solvers
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