Title: Will Shortz Presents Ferocious Sudoku: 200 Hard Puzzles, Author: Will Shortz
Title: Will Shortz Presents Hard Sudoku Volume 8: 200 Challenging Puzzles, Author: Will Shortz
Title: mental_floss Sudoku: It's the Brain Candy You've Been Craving!, Author: Frank Longo
Title: Big Jumbo Sudoku, Author: Bristol Park Books
Title: Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles, Author: Will Shortz
Title: Absolutely Nasty Sudoku Level 4, Author: Frank Longo
Title: Will Shortz Presents Keep Calm and Sudoku On: 200 Easy to Hard Puzzles, Author: The New York Times
Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
Title: Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Sudoku & Chill: 200 Easy to Hard Puzzles, Author: Will Shortz
Title: Second-Degree Black Belt Sudoku, Author: Frank Longo
Title: Super Ultimate Sudoku, Author: Bristol Park Books
Title: The Biggest, Bestest Book of Sudoku, Author: Nikoli Publishing
Title: Brain Games Relax and Solve Sudoku, Author: PIL
Title: Third-Degree Black Belt Sudoku, Author: Frank Longo
Title: Go!Games The Sudoku Challenge: 240 Entertain Your Brain Puzzles, Author: Terry Stickels
Title: Expert Sudoku, Author: Nikoli Publishing
Title: Mini Brain Games Sudoku Chalkboard, Author: PIL

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