% nurikabe 436 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/436.a.htm
nurikabe
medium-
13 13
......2.2.4..
....3........
.............
5.4...3...4.3
.1...........
...3....1....
.........2...
3..2.1.4.....
.............
..3.........3
......2.2....
....2.......2
3.2.......5..
