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Pages: 212, Paperback, Independently published
Independently Published
Kropki Sudoku Extreme: 500 Expert‑Level 9x9 Logic Puzzles with Solutions
500 Expert Sudoku Puzzles for Advanced Solvers: Extreme Challenge Book with Solutions...
Impossible Sudoku Challenge: 500 Insanely Hard Puzzles for Adults Expert Level Brain...
Compact Hard Sudoku Challenge: 500 to Extreme Puzzles with Complete Solutions
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