% slitherlink 175 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/175.a.htm
slitherlink
hard-
20 15
3.232..232..2..2...3
2.....3.2......2....
2.2.....13.22.221.3.
2.2312..2.2.1213.32.
2.23..3322.2..23..2.
...2...2.3....1.3..1
3.21..2.21....2.....
3..2..13..2..22.3.2.
....2...23....3.2322
.23..0...1.32.03...3
.212.2.1.1.21.231...
3.2..2.32.222.22...3
1223...1121.22..3.2.
.22..........2.23...
3.3.3.3.32.12.......
