% slitherlink 439 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/439.a.htm
slitherlink
very hard
30 20
..3.21212.3..22...22....312...
2..1.233.1...22...3.3.3......2
.3......1..3..1..2...1..2..2.2
2.13.31.31....32231.3.12.32122
2.220.313.3.2.22.3.22.12...2..
...........2.....3..33..2..11.
...2.3.2..212222..2.112.32.3..
3..2.....222...23...3..1....22
.13..3.3.....1....2123....1..3
.321.23..2...112.23...02..2.13
.2..20..2.22..2...1...32...2.3
.22...331.1.2.23..2.2....12122
...3..1.2..3......1..3..3..1.3
.1..2.3....12.112..3.0.....2.1
2233.1.0...32.3.3...32..31...2
.221.1..3....13.203....1..1...
.....1.13.3..2.........3....2.
..2.2....2.3....111..2.21.2...
.213..2312.1.1.1.2.2.2.1......
323..3.....3.3...1.33..3.312.3
