% slitherlink 74 by ?, http://www.janko.at/Raetsel/Slitherlink/074.a.htm
slitherlink
medium-
10 10
1...13..1.
.31....0..
.3..2....3
...3.2..0.
0.1.3..3.2
2.3..1.1.3
.0..3.3...
3....2..3.
..0....21.
.3..20...3
