% slitherlink 538 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/538.a.htm
slitherlink
medium-
10 10
..1.21..3.
23......1.
..23..23.3
..2.1..0..
2...311..3
0..221...2
..1..0.3..
0.12..01..
.2......13
.1..10.1..
