% nurikabe 405 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/405.a.htm
nurikabe
hard-
15 10
.....3...2.....
...2........2.3
..4.4.....3....
...........1...
3......4.......
..3......1.4..4
........2.2....
.....4.........
3..2...........
.......2...2.4.
