| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Very Easy Sudoku for Beginners Volume 1: Funny Unique Challenge for Math Lover Any Age Year Old. Special Daily Logic Game for Kid Adult Senior to Improve Memory Keep Brain Sharp | 978-1-6517-6O4O-6 (1-6517-6O4O-3) | 2020 |