% slitherlink 190 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/190.a.htm
slitherlink
very hard
30 20
..22.....3.....2...3.23..322.3
2......1..1.3.122.2..2222.2...
312.3.2...21....11...0..2.1...
..3...0.1....32.2.23.12..2.3..
31..1.2.132.....121.3....32.1.
..121..2.3...3.....211..21.2..
.2232...1..2...2.2.112..12..3.
2........1.23.3.13.3...23.3...
.2..2.213.22.32...2..2.2...1..
.3.3..1...22.1.1..21....1.3332
2.1..2.3123..2..32.1.12.32....
3.23.12.23..21.12222.1..222222
.11.13.....3.....3.322.2......
3..3..33..22....2.02..311.2.12
.21..2.22.2.2......2212...2332
2.1...1.1..12.2.........2.2...
2.13..23.222.3.13..22.2..22.32
..2..23..1.21....2..1...2.12.2
.2..1112....333....222.2..3.22
..1...3.1......21..23.3.322..3
