% slitherlink 489 by Hobbit's Room, http://www.janko.at/Raetsel/Slitherlink/489.a.htm
slitherlink
medium-
10 10
...1...1..
.20..3..2.
3...3.1.3.
..1..1...0
.0.2...1..
..3...1.1.
1...0..3..
.0.1.3...1
.3..3..31.
..1...0...
