% slitherlink 312 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/312.a.htm
slitherlink
hard-
16 12
..3..23.3...1..3
1.0...3......33.
..1.31.12..3...2
1....0.1..1.1...
..23...013.1..0.
..131.1.........
.2..23..2121113.
.1.3..1.13......
.3.1.1.3..1....1
....0...03...3..
2.31.22...212.03
1.22..1.1.2.2...
