% slitherlink 510 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/510.a.htm
slitherlink
hard-
24 14
..23..2.1.2.....2...13..
........33.2.2..2.1.32.2
..3.3.31.1...2.13.31....
..3.2.....32........3.32
.21.23.23..1212.322.....
3.3....2..3..2132..222.2
....222.3.0...12..121..3
..223.....22..13..3..3.2
3.2.0..2....2.12..0.2.11
31..3..1.23..32.2.23....
...1....3.3.313.21..2...
.1311...3...2.2.....21..
.122.2313..0.2.2212223.3
3.33....22...2.2.322....
