Hard Sudoku puzzle books vol. 1: Hard, Very Hard and Extremely Hard Sudoku - Total 300 Sudoku puzzles to solve - Includes solutions (Hard to extreme)
| Country | USA |
| Brand | HatButik. |
| Manufacturer | HatButik |
| Binding | Toy |
| ItemPartNumber | PT-22489 |
| Color | Black and White |
| ReleaseDate | 0000-00-00 |