- くろいの
- The Largest Sudoku Book in the History of the Universe: 2000 Puzzles with 5 Difficulty Levels
- Large Print Sudoku: 200 Easy to Medium Level Puzzles
- Diabolical Sudoku: 200 Cruel, Blood-Boiling, Vicious, Challenging Puzzles
- Prickly Sudoku: 200 Medium, Break-a-Sweat, Moderately Difficult, Intermediate Puzzles










