% slitherlink 636 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/636.a.htm
slitherlink
very hard
19 16
3.3..3.3..3212...33
.21......1....1.1..
.....3.12231....232
.2.30.2.....3223...
3.2..32.1.3..11.2.1
.........2.12....3.
.323.2..21..2.032..
....2.1..2.3.2.3..3
...1..23.....2..31.
2.3......1....1....
22.12.21..30221...1
.2.2...221..33.3...
2..32.3.3......1..3
......3.2.32..2.31.
3.312..2.3..13..2..
.3.3..23.2.2...3323
