% slitherlink 730 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/730.a.htm
slitherlink
hard-
16 12
.1..2.31.22.2.3.
13..1..01.....2.
....31...3.2..31
..3....11..23..3
1.0.......12.3.3
1.32..3.........
.........0..32.2
2.1.32.......2.2
2..13..13....2..
32..2.2...12....
.2.....11..3..03
.0.3.22.01.3..2.
