Title: Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles, Author: Will Shortz
Title: Mini Brain Games Stress Free Sudoku, Author: PIL
Title: Will Shortz Presents Hot Sudoku: 200 Very Hard Puzzles, Author: Will Shortz
Title: Will Shortz Presents Hard Sudoku, Volume 7: 200 Challenging Puzzles, Author: Will Shortz
Title: Masterpiece Paint-doku, Author: Conceptis Puzzles
Title: Will Shortz Presents Hard Sudoku Volume 6: 200 Challenging Puzzles, Author: Will Shortz
Title: Second-Degree Black Belt Sudoku®, Author: Frank Longo
Title: Absolutely Nasty® Sudoku Level 4, Author: Frank Longo
Title: Will Shortz Presents The Little Black Book of Sudoku: 400 Puzzles, Author: Will Shortz
Title: Third-Degree Black Belt Sudoku®, Author: Frank Longo
Title: Will Shortz Presents Extra Hot Sudoku: 200 Hard Puzzles: Hard Sudoku Volume 1, Author: Will Shortz
Title: Samurai Sudoku - Easy to Extreme - Volume 1 - 159 Puzzles, Author: Nick Snels
Title: Will Shortz Presents Hard Sudoku Volume 4: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents The Ultimate Book of Easy Sudoku: 300 Fun Puzzles, Author: Will Shortz
Title: Second-Degree Brown Belt Sudoku®, Author: Frank Longo
Title: USA Today Jumbo Puzzle Book 2: 400 Brain Games for Every Day, Author: USA TODAY
Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
Title: Will Shortz Presents The Great Big Book of Sudoku Volume 1: 500 Easy to Hard Puzzles to Exercise Your Brain, Author: Will Shortz
Title: Expert Sudoku, Author: Nikoli Publishing
Title: Sudoku Puzzle Book: 800 Medium Puzzles: Single Difficulty Level for No Wasted Puzzles, Author: Sudoku Puzzle Books

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