% slitherlink 431 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/431.a.htm
slitherlink
medium-
10 10
3.3....1.3
..2.11..2.
.223.32..2
3.1.3.2.12
3.....1.2.
.......32.
3.3.32....
1122..21..
2.2....3.3
....213...
