Only Extreme Sudoku: 400 Extremely Challenging Puzzles
| Country | USA |
| Brand | CREATESPACE |
| Manufacturer | CreateSpace Independent Publishing Platform |
| Binding | Paperback |
| IsAdultProduct | |
| Height | 9 |
| Length | 6 |
| Weight | 0.34999999970649 |
| Width | 0.24 |
| ReleaseDate | 0000-00-00 |