Title: The Biggest, Bestest Book of Sudoku, Author: Nikoli Publishing
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: Blockbuster Book of Sudoku, Author: Frank Longo
Title: Third-Degree Black Belt Sudoku, Author: Frank Longo
Title: Sudoku, Author: Eric Saunders
Title: Absolutely Nasty Sudoku Level 4, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku, Volume 7: 200 Challenging Puzzles, Author: Will Shortz
Title: Expert Sudoku, Author: Nikoli Publishing
Title: Will Shortz Presents Tame Sudoku: 200 Easy Puzzles, Author: Will Shortz
Title: Poolside Sudoku, Author: Frank Longo
Title: Absolutely Nasty Sudoku Level 3, Author: Frank Longo
Title: White Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Will Shortz Presents Large-Print Sudoku To Go: 300 Easy to Hard Puzzles to Boost Your Brainpower, Author: Will Shortz
Title: Green Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Will Shortz Presents Hard Sudoku Volume 6: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Devious Sudoku: 200 Very Hard Puzzles, Author: Will Shortz
Title: Absolutely Nasty Sudoku Level 2, Author: Frank Longo
Title: Brown Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles
Title: Black Belt Sudoku Variants: 300 Puzzles, Author: Conceptis Puzzles

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