% slitherlink 187 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/187.a.htm
slitherlink
very hard
30 20
..2....23.22..1.2.33.332...32.
...12....3221...2202.1...3...3
213...222......1...2....2..3..
3........3..1.......2223.3..2.
32.2.212...0.1.3123....32.13.3
...22...2.32.......1..2....2..
12122..23.13.21....21..3322.32
.2.1........1..3.3.3.2..1....3
..2.131..2.3.21321.2..322.32.2
....1..2133.21.3..3..1........
..2.1..32.12.......22322123121
12.2....2.22..2.3.2.2......1.2
...3222.2.1.21.2.012.........2
....1.0.22..0..3.2...2..3.2...
332...1...22..2...2.2..2..2..3
.2..32.30...22.1....1.33..2..2
.2..3.2.33..2221...13..222221.
.2..3.....1221.32....3.3.1....
231.2.3.31....2...1...1.3..22.
3.2.2.2...3..023.33..1....2...
