% nurikabe 420 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/420.a.htm
nurikabe
medium-
15 10
.2.5.3.3.2..5.3
...............
...............
2........2.....
..4..2..2..2...
2..............
...........2.8.
.3..........3..
......4........
....3...5......
