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Pages: 238, Paperback, Independently published
Independently Published
Gray Matter Vol24: the Mind's Edge: Extreme Sudoku for Savvy Solver
Gray Matter Vol34: Absolute Gridlock: Extreme Sudoku for the Unstoppable Solver
Gray Matter Vol23: Mental Maze: Extreme Sudoku: For the Hardened Solver
Gray Matter Vol36: Demonic Digits: Your Ultimate Extreme Sudoku Challenge
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