% slitherlink 575 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/575.a.htm
slitherlink
medium-
18 10
.3.3.10.13..0.23..
.021.3..2.3.2...20
3...2.11.1.2.13...
..2.2.....1..2..22
3.2.3..0...21..3..
..2..21...3..0.3.3
23..1..0.....2.2..
...23.1.2.31.3...3
20...1.3.3..2.031.
..33.2..11.31.1.2.
