% slitherlink 568 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/568.a.htm
slitherlink
hard-
24 14
.3.1.2.3..3..3.21...3.1.
3...3....20...0..31.3..3
..13.0.3.3.....301...1..
30....1..0.203.2..2.0..3
2..02..3..2.3....3.3..3.
.3....3.0.3...1....2..11
1...101......33.3.0..23.
.23..2.3.33......233...1
22..1....0...3.3.1....0.
.3..2.1....2.2..3..03..2
3..3.3..1.320.2..1....30
..0...312.....3.1.3.10..
0..1.23..2...02....2...3
.3.3...32.2..3..0.3.0.3.
