% slitherlink 569 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/569.a.htm
slitherlink
hard-
24 14
...113...013...022...122
130...132...311...113...
....0.....3.....3.....1.
.3..2..0..1..3..1..3..0.
.1..3..3..2..1..1..0..2.
.0.....1.....3.....2....
...211...012...312...012
302...232...332...323...
....3.....2.....3.....3.
.3..1..3..0..1..1..0..3.
.3..0..1..3..0..2..1..1.
.3.....3.....2.....3....
...211...113...322...232
223...320...232...323...
