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Title: Will Shortz Presents Hard Sudoku Volume 8: 200 Challenging Puzzles, Author: Will Shortz
Title: Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game, Author: Nikoli Publishing
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Title: White Belt Sudoku®, Author: Michael Rios
Title: Black Belt Sudoku®, Author: Michael Rios
Title: Green Belt Sudoku®, Author: Michael Rios
Title: Will Shortz Presents Lazy Day Sudoku: 300 Easy to Hard Puzzles, Author: Will Shortz
Title: X-Treme Sudoku, Author: Editors of Nikoli Publishing
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Title: Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles, Author: Will Shortz
Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
Title: Will Shortz Presents Keep Calm and Sudoku On: 200 Easy to Hard Puzzles, Author: The New York Times
Title: Second-Degree Black Belt Sudoku®, Author: Frank Longo
Title: Blockbuster Book of Sudoku, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
Title: Third-Degree Black Belt Sudoku®, Author: Frank Longo
Title: Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles, Author: Will Shortz

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