- Medium and Hard Sudoku Puzzles: 200 Medium and Hard Sudoku Puzzles
- Very Hard Sudoku Puzzle Book Volume 1: Very Hard Sudoku Puzzles for Advanced Players
- Very Hard Difficulty Sudoku Puzzles Volume 3: Very Hard Sudoku Puzzles for Advanced Players
- Medium Sudoku Puzzles Volume 3: Medium Sudoku Puzzles For Intermediate Players
- Hard Sudoku Puzzle Book Volume 2: Hard Sudoku Puzzles for Advanced Players






























