% nurikabe 425 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/425.a.htm
nurikabe
medium-
12 12
1....4......
......1.3...
.1..2.....3.
.....2...4..
...2.......2
.2.....2....
.........1..
.1...4......
......2....2
3........4..
...........4
.3..3..2....
