% slitherlink 430 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/430.a.htm
slitherlink
very hard
30 20
3.23...33.1......1...13.22....
.3..12....22.2...13.3....22...
.2.23.2.3121...2.1..32....33.2
2..31312...3.2...12..2..3...23
.2121......2....21.2.121.1.32.
..2.1.23..22203.3..122..221..3
....121....2.2.1.3..2..3....3.
23..2...23.22.1.......2...1..1
22..11......123....3...2.22...
..2..2..2.02.2.1.21.2...3..212
.1...2...3...2..12...12..2.1..
2..312....31.2.3...13......2.2
1.2.0..31....2..1.2...333222.2
3.3..2.2..3..3.3...21......112
.2.1..2.2..2........222....2.3
3..3..1.231.122.312..3..3.322.
2...0.2..3.2.2....2.1.31.1.0..
3....3.23..13222..2213.2.33..3
323122....2221311.....21...12.
3...2.1.3......32.323.2.33...0
