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Pages: 264, Paperback, CreateSpace Independent Publishing Platform
Independently Published
Hard Sudoku: 120 Extremely Challenging Puzzles for Sudoku Experts
Challenging Sudoku Puzzles for Adults: 400 Extreme with Step by Online Solutions
Extreme Sudoku Puzzle Book for Experts: Challenging 16x16 Puzzles Designed Advanced Solvers Only
Extreme Sudoku Challenging puzzles to challenge your mind
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