Aims to help you find the perfect sudoku challenge and become a master. Just like karate, these puzzle collections are ranked by different-colored belts and they're organized by level. Beginners can move from book to book as their skills improve. By the time they reach Black (Level 9), they're ready to take on super-tough sudokos.
- Limba : Engleza
- Data Publicarii : 18 May 2006
- Format : Paperback
- Numar pagini : 96
- ISBN : 9781402737619