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Pages: 179, Paperback, Independently published
Independently Published
144 Hard Sudoku Puzzles: Challenging Logic Puzzles for Experienced Solvers
Hard to Extreme Sudoku Puzzles — Volume 2: Over 350 Very Difficult...
Hard 9x9 Sudoku Puzzle Book: 60 Challenging Puzzles with Solutions for Experienced Solvers
Hard Sudoku Puzzle Book: 110 Challenging Puzzles for Experienced Solvers Full Solutions Included
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