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Title: Will Shortz Presents The Ultimate Book of Easy Sudoku: 300 Fun Puzzles, Author: Will Shortz
Title: Brown Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Ultimate Mind Games, Author: Parragon
Title: Sudoku for Brain Fitness: 90-Day Challenge to Sharpen the Mind and Strengthen Cognitive Skills, Author: Steven Clontz
Title: The Nastiest Sudoku Book Ever, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku, Volume 2: 200 Challenging Puzzles, Author: Will Shortz
Title: Way Beyond Black Belt Sudoku, Author: Frank Longo
Title: Second-Degree Green Belt Sudoku, Author: Frank Longo
Title: Third-Degree White Belt Sudoku, Author: Frank Longo
Title: Sudoku Rush: Test Your Skills and Beat the Clock with 175+ Easy to Hard Challenges, Author: Charles Timmerman
Title: The Original Sudoku Book 2, Author: Editors of Nikoli Publishing
Title: Large Print Sudoku Puzzles Green: Over 200 Puzzles to Complete, Author: Parragon
Title: Second-Degree Brown Belt Sudoku, Author: Frank Longo
Title: Mindworks Sudoku Puzzles, Author: Solve it
Title: Will Shortz Presents Terrifying Sudoku: The Hardest Puzzles, Author: Will Shortz
Title: 200 Stress-Relieving Sudoku Puzzles to Sharpen Your Mind: Presented by Maria Shriver, Patrick Schwarzenegger, and MOSH, Author: Maria Shriver
Title: Third-Degree Brown Belt Sudoku, Author: Frank Longo
Title: Will Shortz Presents Extra Hot Sudoku: 200 Hard Puzzles: Hard Sudoku Volume 1, Author: Will Shortz

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