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Pages: 152, Paperback, Independently published
Independently Published
Hard Sudoku Puzzles: 144 Challenging Logic Puzzles for Experts
Sudoku Brain Workout: Challenging Puzzles for Experts
Hard Sudoku: 100 Challenging Puzzles for Experts — With Full Solutions (Volume 3)
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Only Extreme Sudoku: 400 Extremely Challenging Puzzles
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