Extreme Sudoku: A collection of 200 of the toughest Sudoku puzzles known to man. (With their solutions.)
| Country | USA |
| Brand | HQN |
| Manufacturer | HQN Books |
| Binding | Mass Market Paperback |
| ItemPartNumber | new18-20160824-c0033750 |
| ReleaseDate | 2012-10-23 |
| UnitCount | 1 |
| EANs | 9780373776962 |