Sudoku 50-50 Challenge Book #1 Hard: Can you do 50 hard puzzles in 50 days?
| Country | USA |
| Brand | Hertfordshire Publications |
| Manufacturer | Hertfordshire Publications |
| Binding | Paperback |
| PartNumber | RKC2009319696 |
| Height | 9.25 |
| Length | 6.25 |
| Weight | 1.10010668738 |
| Width | 0.5 |
| NumberOfItems | 1 |
| ReleaseDate | 0000-00-00 |