% slitherlink 560 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/560.a.htm
slitherlink
very hard
19 16
..3.........3......
2.12.22..23....3...
33..2.222.3.231.32.
2....12.132.3.1..12
2.22...32.1...1312.
..1..........2.....
3.2...223....12002.
2122.1.1213..2.0.2.
.....3....22.....3.
..20023......3.2..3
..2.1..222.2..31...
.22.32..12..2..2.2.
.1...0...12.31.....
..0..22123....3...3
2.3.2.2....3.23.2..
...2....2..2.....33
