Extreme Sudoku: A collection of 200 of the toughest Sudoku puzzles known to man. (With their solutions.)
| Country | USA |
| Brand | Avia |
| Manufacturer | Avia |
| Binding | Shoes |
| Model | Avia 821 |
| Color | White/Black Trim |
| Size | 12 Women/10.5 Men |
| UPCs | 195962333362 |
| EANs | 0195962333362 |
| ReleaseDate | 0000-00-00 |