% slitherlink 566 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/566.a.htm
slitherlink
medium-
18 10
.22.0...21...0.31.
11....1....3....20
...3.32.10.30.1...
0................2
2.11.03.13.11.33.3
3.13.32.03.21.22.2
2................3
...3.21.30.10.3...
30....1....2....21
.32.0...31...2.31.
