| 其他書名 | Extreme Puzzle Book Adult, Very Hard Sudoku Puzzle Books, Sudoku From Hell, The Huge Book of Sudoku Puzzles |
| 出版 | Independently Published, 2020-08-05 |
| 主題 | Games & Activities / Sudoku |
| ISBN | 9798672608792 |
| URL | http://books.google.com.hk/books?id=hy2-zQEACAAJ&hl=&source=gbs_api |