Title: The Original Sudoku, Author: Editors of Nikoli Publishing
Title: Mensa Sudoku, Author: Michael Rios
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
Title: Black Belt Sudoku, Author: Michael Rios
Title: White Belt Sudoku, Author: Michael Rios
Title: Brown Belt Sudoku, Author: Michael Rios
Title: Sudoku Variants, Author: Conceptis Puzzles
Title: Mindworks Sudoku Puzzles, Author: Solve it
Title: Green Belt Sudoku, Author: Michael Rios
Title: X-Treme Sudoku, Author: Editors of Nikoli Publishing
Title: Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles, Author: Will Shortz
Title: Will Shortz Presents Lazy Day Sudoku: 300 Easy to Hard Puzzles, Author: Will Shortz
Title: Blockbuster Book of Sudoku, Author: Frank Longo
Title: Absolutely Nasty Sudoku Level 4, Author: Frank Longo
Title: Second-Degree Black Belt Sudoku, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
Title: Poolside Sudoku, Author: Frank Longo
Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
Title: mental_floss Sudoku: It's the Brain Candy You've Been Craving!, Author: Frank Longo

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