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Title: Will Shortz Presents The Great Big Book of Sudoku Volume 1: 500 Easy to Hard Puzzles to Exercise Your Brain, Author: Will Shortz
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Title: Third-Degree White Belt Sudoku®, Author: Frank Longo
Title: Second-Degree Brown Belt Sudoku®, Author: Frank Longo
Title: Will Shortz Presents Mind-Melting Sudoku: 200 Cranium-Crushing Puzzles, Author: Will Shortz
Title: Way Beyond Black Belt Sudoku®, Author: Frank Longo
Title: Will Shortz Presents Steeped in Sudoku: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Red Hot Sudoku: 200 Challenging Puzzles, Author: Will Shortz
Title: Blockbuster Book of Sudoku, Author: Frank Longo
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Title: Will Shortz Presents The Epic Book of Extreme Sudoku: 300 Challenging Puzzles, Author: Will Shortz
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Title: The Nastiest Sudoku Book Ever, Author: Frank Longo

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