Robert Macmillan
I'm Human Thank God!- Killer Samurai Sudoku, Book 1
- Killer Samurai Sudoku, Book 2
- Killer Sudoku for Beginners, Book 1
- Killer Sudoku for Beginners, Book 2
- Killer Sudoku for Beginners, Book 3
- Killer Sudoku for Experts, Book 1
- Killer Sudoku for Experts, Book 2
- Killer Sudoku for Experts, Book 3
- Killer Sudoku for Experts, Book 4
- Killer Sudoku, Book 2
- Killer Sudoku, Book 3