% nurikabe 630 by Mokuani, http://www.janko.at/Raetsel/Nurikabe/630.a.htm
nurikabe
medium-
17 17
.......6.3.....8.
..............7..
.................
.3...2.2.........
......2.2........
.6.............1.
3..2..........3..
.................
..........a....4.
........a.......3
..........1..4...
..4...3..........
.6......5.......2
............3....
.4...............
5......4....2....
........6.....2.4
