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By the Author
Skill Builder Sudoku: Easy to Medium
Skill Builder Sudoku: Medium to Hard
Skill Builder Sudoku: Hard to Expert
Pause for Puzzles: Sudoku for Mindfulness
Sudoku Puzzles for the Weekend
Blockbuster Book of Sudoku
Way Beyond Black Belt Sudoku®
mental_floss Sudoku
Puzzlewright Guide to Solving Sudoku
The Nastiest Sudoku Book Ever
Beyond Black Belt Sudoku
Poolside Sudoku
Third-Degree White Belt Sudoku®
Third-Degree Brown Belt Sudoku®
Third-Degree Black Belt Sudoku®
Absolutely Nasty® Sudoku Level 1
Absolutely Nasty® Sudoku Level 2
Absolutely Nasty® Sudoku Level 3
Absolutely Nasty® Sudoku Level 4
Second-Degree Green Belt Sudoku®
Second-Degree Brown Belt Sudoku®
Second-Degree Black Belt Sudoku®