- Medium Sudoku Puzzle Book: 432 Medium Sudoku Puzzles for Adults (Medium Sudoku Series)
- Easy Sudoku Puzzle Book: 432 Puzzles for Adults
- Easy Sudoku Puzzle Book: 432 Puzzles for Adults – Volume 3 (Easy Sudoku Series)
- Sudoku Puzzle Book: 432 Puzzles for Adults: Easy to Hard – Volume 2 (Sudoku Variety Series)
- Hard Sudoku Puzzle Book: 432 Challenging Sudoku Puzzles for Adults (Hard Sudoku Series)













