% slitherlink 723 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/723.a.htm
slitherlink
medium-
12 12
.3331.31.2.1
.0...2...0.2
3......0...3
3.0.3.3..232
1.......11..
...11......2
2......33...
..03.......2
202..2.2.2.1
3...2......2
2.0...2...2.
1.2.12.2132.
