Extreme Sudoku: A collection of 200 of the toughest Sudoku puzzles known to man. (With their solutions.)
| Country | USA |
| Brand | Ricordi |
| Manufacturer | Ricordi |
| Binding | Paperback |
| ItemPartNumber | USC 00010100 |
| UnitCount | 1 |
| UPCs | 884088577544 |
| EANs | 9790215202979 |
| ReleaseDate | 0000-00-00 |