% slitherlink 186 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/186.a.htm
slitherlink
very hard
30 20
....3.2.22.3.1.2..33.13....2..
2....2..3...2......1.2...333.2
23..2..2.2....1.2.2..3....1.22
..12.2.0.213132.13.......2322.
12..2.223.2....223....2....322
.222.22....2.1....13.3.13.2..2
2.23..20.....3.1.23......02...
33..1..2.3..2..131..2.23..3.2.
...2.3....0.2032....120.2...13
2322..121.3......2......22..2.
13...32...1.12.2..32.....1.213
.....1....2..22....1...22.....
.002.2.2.2..1.1223.12..3.3.322
32.1.1.222........1..12.....21
2223.3..2....2.23.2.3..01..23.
..2..1....31312.21.2..23..3123
3.23.3.21.........3.2.1...2.2.
..2.22...22...3.......1311....
31..2.120212.1..213..22.3....3
.22....333.3.32..3...12...3.3.
