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Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game by Nikoli Publishing, Paperback

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About the Book Here are some really difficult Sudoku puzzles that will definitely kill your boredom. Difficult puzzles work best if you are trying to

Killer Sudoku Hard to Extreme Puzzles - by Senor Sudoku (Paperback)

Skyscraper Sudoku: 200 Number Logic Puzzles - Large Print - Easy to Hard Levels for Adults, Seniors, Teens, and Kids (Large Print Edition) - Magers & Quinn Booksellers