- Jumbo Challenge Sudoku for Ages 9-13 Years Vol 1: 300 Hard Sudoku Puzzles for Preteens and Teens to Enjoy
- Jumbo Challenge Sudoku Ages 9-13 Years Vol 2: 300 Puzzles for Ages 9-12 Years
- Jumbo Challenge Sudoku for Adults Vol 1: 300 Hard Puzzles and Answers for Adults
- Jumbo Easy Sudoku for Adults Vol 2: 300 Puzzles for Adults
- JUMBO CHALLENGE SUDOKU FOR TEENS VOL 1: 300 PUZZLES FOR THE ADVANCED PLAYER AGES 13-19 YEARS