% slitherlink 678 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/678.a.htm
slitherlink
very hard
19 16
...222.2...........
2..221.....1.12.1.2
320...3.33.2..1..21
.1..122211.1.2.2.1.
...222.2.2..3.2...2
..0...01..2...31322
2.3.12...3.31122.2.
.......2.31..2..2..
1..31...2...1.0...2
3..3.2211...1.2.3.1
.3..2.2...2.0.....3
...31.3.2.0.22132..
..2..3....2.12...3.
3...1...220.2...3..
.....32..32..1...1.
32.33.32.22.3.3.32.
