% nurikabe 576 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/576.a.htm
nurikabe
hard-
15 10
.2...2.2....3..
..........2....
........3....4.
3....4.........
.2..4..........
..............4
..2......3.....
....4..........
3.2......2....4
.......4....4..
