% slitherlink 656 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/656.a.htm
slitherlink
hard-
17 17
.32....2....23.2.
2....1.3.312..1..
2312.23..2...3..3
2.2.11223.3.2..1.
..1.1.3...13.33.3
22..2...3....2.3.
2.21.2.2..13.....
0.....22..1.2...2
2..23.121...212.2
.2.20.23.31..2.03
....12.21.2..2...
2.......332..231.
223...22..112..2.
2..22.1.2....3.22
2.....32..3.1..2.
302....231.....3.
..3..3.12..23.3.3
