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 | Mumaxun |
| Manufacturer | Mumaxun |
| Binding | Unknown Binding |
| ItemPartNumber | MMX-319 |
| Model | MMX-319 |
| UPCs | 782321885572 |
| EANs | 0782321885572 |
| ReleaseDate | 0000-00-00 |