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Pages: 100, Paperback, Independently published
Independently Published
Sudoku Expert: 50 Extreme Puzzles for Serious Solvers The Ultimate Challenge Masters
Sudoku 16x16: The Ultimate Challenge for Advanced Solvers
Hard Sudoku Challenge: 36 Expert Puzzles for Advanced Solvers
Hard Sudoku Puzzle Book for Adults: 55 Expert-Level Challenges The Serious Solver:...
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