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Pages: 238, Paperback, Independently published
Independently Published
Gray Matter Vol18: Wit's Whetstone: 200 Extreme Sudoku Puzzles for the Master Solver
Gray Matter Vol25: Cerebral Abyss: Extreme Sudoku for the Unyielding Mind
Gray Matter Vol24: the Mind's Edge: Extreme Sudoku for Savvy Solver
Gray Matter Vol27: Ultimate Challenge: Extreme Sudoku for the Savvy Solver
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