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Pages: 238, Paperback, Independently published
Independently Published
Gray Matter Vol20: Thought's Threshold: Extreme Sudoku for the Unyielding Mind
Gray Matter Vol33: Merciless Matrices: Extreme Sudoku for the Unyielding Mind
Gray Matter Vol22: Cognitive Ciphers: Extreme Sudoku for the Unyielding Mind
Gray Matter Vol14: Synapse Strain: Extreme Hard Sudoku for the Unyielding Mind
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