Most Popular Books
- Sudoku Medium Puzzles Volume 1: 400 Sudoku Medium Puzzles
- Sudoku Very Hard Puzzles Volume 1: 400 Sudoku Puzzles - Very Hard Level
- Sudoku Medium Puzzles Volume 3: 400 Sudoku Puzzles - Medium Level
- SUDOKU MEDIUM and SUDOKU HARD Volume 1: 400 Sudoku Medium and Sudoku Hard Puzzles
- Sudoku Hard Puzzles Volume 3: 400 Sudoku Puzzles - Hard Level