- Expert Sudoku Volume 1: 600 Brain-Engaging Puzzles for Experts
- Challenger Sudoku Volume 1: 600 Brain-Engaging Puzzles for Experienced Solvers
- Intermediate Sudoku Volume 1: 600 Brain-Engaging Puzzles for Intermediate Solvers
- Upper Intermediate Sudoku Volume 1: 600 Brain-Engaging Puzzles for Upper Intermediate Solvers
- Beginner Sudoku – Travel Size Volume 1: 300 Brain-Engaging Puzzles for Beginners










