- Sudoku 1,000 Puzzles, 500 Easy and 500 Medium: Keep Your Brain Active for Hours with This Sudoku Puzzle Book
- Sudoku 1,000 Medium Puzzles: Keep Your Brain Active for Hours. an Active Brain Series 2 Book
- 500 Extra Hard Sudoku Puzzles: Active Brain Series Book 4
- Sudoku 1,500 Medium Puzzles: Keep Your Brain Active For Hours. An Active Brain Series 2 Book
- Sudoku 400 Giant Size Puzzles, 200 Easy and 200 Medium, to Keep Your Brain Active for Hours: Take Your Playing to the Next Level with Two Difficulties in One Book