Extreme Sudoku: A collection of 200 of the toughest Sudoku puzzles known to man. (With their solutions.)
| Country | USA |
| Brand | PUMA |
| Manufacturer | PUMA |
| Binding | Shoes |
| ItemPartNumber | 30863501 |
| Model | 34DC094-OFW |
| Color | Black |
| Size | 10 |
| UPCs | 197673208083 |
| EANs | 0197673208083 |
| ReleaseDate | 0000-00-00 |