Title: Poolside Sudoku, Author: Frank Longo
Title: The Biggest, Bestest Book of Sudoku, Author: Nikoli Publishing
Title: Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles, Author: Will Shortz
Title: Second-Degree Black Belt Sudoku®, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Sudoku & Chill: 200 Easy to Hard Puzzles, Author: Will Shortz
Title: Third-Degree Black Belt Sudoku®, Author: Frank Longo
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: Will Shortz Presents Ferocious Sudoku: 200 Hard Puzzles, Author: Will Shortz
Title: Absolutely Nasty® Sudoku Level 3, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
Title: Go!Games The Sudoku Challenge: 240 Entertain Your Brain Puzzles, Author: Terry Stickels
Title: Expert Sudoku, Author: Nikoli Publishing
Title: White Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Will Shortz Presents Tame Sudoku: 200 Easy Puzzles, Author: Will Shortz
Title: Will Shortz Presents Large-Print Sudoku To Go: 300 Easy to Hard Puzzles to Boost Your Brainpower, Author: Will Shortz
Title: Black Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Will Shortz Presents Hard Sudoku, Volume 7: 200 Challenging Puzzles, Author: Will Shortz
Title: Absolutely Nasty® Sudoku Level 2, Author: Frank Longo

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