% slitherlink 177 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/177.a.htm
slitherlink
hard-
20 15
3.....3.............
.12.3...3..2.323.122
3...0.3.....2213..22
3..31....12.2.1.2..2
....222....20.3..2.1
2.1.3223122.1....32.
2..2..2......322.212
23..3.0.12.2..2....2
..21...2.33.2.3.211.
2..231.2..2.0..23.3.
.3...32221.12....0..
1.0....21..2..3..23.
..3.23322....2...2..
.....22.....3.32..22
...22...31.....212..
