- Sudoku Puzzles: 420 Sudoku Puzzles 9x9 (Medium & Hard), Volume 3
- Sudoku Puzzles: 420 Sudoku Puzzles 9x9 (Easy, Medium, Hard, Super Hard), Volume 1
- Sudoku Puzzles: 420 Diagonal Sudoku Puzzles 9x9 (Easy, Medium, Hard, Super Hard), Volume 5
- Sudoku Puzzles: 420 Jigsaw Sudoku Puzzles 9x9 (Easy, Medium, Hard, Super Hard), Volume 6
- Sudoku Easy: 500 Sudoku Puzzles in 5 Easy Levels









