% slitherlink 539 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/539.a.htm
slitherlink
medium-
10 10
3...02.233
3.0...0...
3...1...0.
.3..32....
1..1..30.3
2.11..2..1
....22..1.
.2...3...1
...1...2.1
313.31...0
