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Pages: 103, Paperback, Independently published
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Hard sudoku Puzzles: 200 tough puzzles
Independently Published
500 Brutal Sudoku Puzzles for Experts: Very Hard to Extreme Difficulty Serious...
Sudoku: The Ultimate Challenge for Expert Solvers!: 400+ Hard Puzzles (The Sudoku Series)
100 Hard Sudoku Puzzles for Experts Volume 3: Puzzle Books (Hard) (Expert)
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