level: simple
6.....7.3.4.8.................5.4.8.7..2.....1.3.......2.....5.....7.9......1.... | initial |
618459723342867519579123468296534187784291635153786294927648351861375942435912876 | solved |
level: simple
Top 95 Sudokus 084 [sudoku:top95] “95 Hard Puzzles”, http://magictour.free.fr/top95, or http://norvig.com/top95.txt