% slitherlink 181 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/181.a.htm
slitherlink
very hard
30 20
.32......3.3.1.3.......32.2.1.
...2...2..0.32.....3.122......
23.23.3.2.1.11..3.1....2.0312.
.2.1.1..33...3.012..3.2.21...3
..22..3.1.23......3...32....1.
.3332.....1.33..2...13.......3
...2.2.12.22...332....01.22...
.2...2.2.2.......1.0.....22312
..3...21.222222.2..2..2.2.1...
322...32222.1..3.3112.12..133.
2...1.2..222..2....3..2..1....
2..2...212..2.2..2....11..2.33
..202231.....2...2..12..2...1.
2.2.2.22..2.3...2....3...3...2
03.2122.33.21...1322.1.32.3..2
2....21..2.32...2.....20....2.
...1....12...3....22...2.1.3..
.3..1.2..2.121..213.213.3.2.13
.2221312.222.2.12.......32..2.
3.23..323.......332.23...2.2..
