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Pages: 157, Paperback, Independently published
Independently Published
Extreme Sudoku Challenge: 1000 Very Hard, Expert & Puzzles for Elite Logic Solvers
Hard Sudoku Only: 250 & Very Classic Puzzles — No Easy Levels, Guessing
Protocol 9: The Sudoku Files: Classification: Expert Level. 50 Data Puzzles for Elite Solvers
Hard Sudoku Puzzles: 250 Advanced Level Classic Puzzles
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