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Pages: 231, Paperback, Independently published
Independently Published
The Little Sudoku Book: Hard: 55 Hard Puzzles for advanced players.
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Hard Sudoku Puzzle Book Volume 2: Puzzles For Advanced Players
Ninja Sudoku: Extreme Level: Hard Puzzles for Advanced Players Brain Training Book
Sudoku Puzzles: Hard puzzles Perfect for advanced players and relaxing fun
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