% slitherlink 558 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/558.a.htm
slitherlink
very hard
19 16
....2...22.2.2...3.
2.2.1.3.2.2..2.222.
3..2.3.33.3.2..1...
.33.2......3..3.2..
1....322.2...0.212.
..32.2..2....2..2..
..2.2.212..3.2.23.2
2.2.2...33..1221.2.
221.3.22.....22..0.
..1...1....2.22..33
...22.23.222.22.12.
.1.3.3....222.3.2..
3.3.1.2.3...22.13..
3.2..3..13.2212....
...3....2....32212.
.213.3..32.2.1...3.
