Sudoku 50-50 Challenge Book #1 Hard: Can you do 50 hard puzzles in 50 days?
| Country | USA |
| Brand | Survival Books, Ltd |
| Manufacturer | Survival Books, Ltd |
| Binding | Paperback |
| PartNumber | Over 200 colour photos and 4 maps |
| Height | 6.24 |
| Length | 5.93 |
| Weight | 2.314853751 |
| Width | 0.43 |
| ReleaseDate | 2016-02-07 |
| NumberOfItems | 1 |