% slitherlink 185 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/185.a.htm
slitherlink
very hard
30 20
.23.32...2...3.1.2332...2.332.
3.21.2.22.31.0..3......3......
3...1.2.21...2.2.2.23.2..3.3.1
3..23....2...1.22.1....2..2..3
...1......22.....1....223..32.
2...3.2.....3.3...31.2..1.2.1.
3.2.1.2.1.223.32..1...3...133.
2..31.23.2.2.2....1..3113..122
.3....3...2....3..13....1.2..2
3.....1....2.2...11..1.2..23..
32.1.....32.33.2.2....2113..1.
...223....2.1..3....2.0..32.2.
.230..1.2....3.21.12.3321.2...
.1...3223.211.........1...32..
..2.2......133...1....3.....2.
33.3.3..21..2.33..12.2.1.022.3
12.....332......2132...1.2.2.2
2.23322.1....3.22...3...2.1..3
...221..2.212.2..22..3.303.32.
.2..32..3.3....2..23.2....222.
