% nurikabe 218 by ooya, http://www.janko.at/Raetsel/Nurikabe/218.a.htm
nurikabe
medium
17 17
2....3..2..2.....
............3...3
...1..5........3.
3.........2......
.a..........4....
...3....1.......2
............5....
...9......1......
.......3......5..
.............2...
.....4....8......
2.......3.......2
.2..........3....
.....2...........
1...2....3.....4.
............2....
.4.....6...1....2
