% nurikabe 226 by ooya, http://www.janko.at/Raetsel/Nurikabe/226.a.htm
nurikabe
medium-
17 17
..4...2..........
.3.....1...2...2.
..........4.....3
....9............
.............7...
.4.....2.........
..4...2...3.....1
...........7...2.
........4........
.2...2...........
3.....3...1...4..
.........2.....1.
...5.............
............4....
3.....8..........
.1...3...1.....4.
..........4...3..
