% nurikabe 421 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/421.a.htm
nurikabe
easy+
12 12
1...3.2..2.2
............
..3..1....3.
......1.....
.3...2....1.
........3...
..1..3......
.......2..2.
2...........
...4.1..2..2
............
2.2..2.....4
