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Title: Beyond Black Belt Sudoku: If You Have to Ask, It's Too Hard for You, Author: Frank Longo
Title: Will Shortz Presents Hard Sudoku Volume 5: 200 Challenging Puzzles, Author: Will Shortz
Title: Will Shortz Presents Hard Sudoku Volume 1: 200 Challenging Puzzles, Author: Will Shortz
Title: mental_floss Sudoku: It's the Brain Candy You've Been Craving!, Author: Frank Longo
Title: Second-Degree Black Belt Sudoku, Author: Frank Longo
Title: Will Shortz Presents The Huge Book of Hard Sudoku: 300 Challenging Puzzles, Author: Will Shortz

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