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Hyper Sudoku: 250 Medium to Hard Four-Box Sudoku Puzzles (Windoku) - Mindful Puzzle Books: 9781089458982 - AbeBooks
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The big book of Hyper Sudoku: 400 Hyper Sudoku Puzzles: Williams, Mr Dewi: 9781501045004: Amazon.com: Books
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Sudoku Variations Puzzle Book: 200 Normal and Hard Level Hyper Sudoku and Sudoku X Puzzles - A Different and Challenging Sudoku Puzzle Book for Adults and Teens - Large Print.: Enigma, Astral:
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Hyper Sudoku: 100 each Medium and Hard Hyper Sudoku puzzles by Bob Briggs, Paperback | Barnes & Noble®
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