% slitherlink 648 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/648.a.htm
slitherlink
hard
24 14
...3.1...1.3..322...3.3.
3..121.2.3.3.2.22.3..11.
.2.3.....2...02....0..32
1...02..33.....21..3.2..
.31.23...2.21.....2.12.1
2.2312.33..2.2202.1....2
.....1...2.2.2..3.21221.
22.1..32.2..33.22..2....
2...33.2..1........232.3
3.01.1.2...3.121313...3.
2.2..3.1....2..2.2..3...
2....2132.1..3..22.212..
...23.2..1212.1..3.122..
.2.132.12...2...222..22.
