% slitherlink 504 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/504.a.htm
slitherlink
medium-
14 10
.3..1.2.2...23
..1....2......
..3..22...2.21
3221.3....33.3
.22.2.13.22.1.
.33.3.1.2...3.
2..1...20.21.1
.3.332..13.2..
..22....3.....
3.22.1....332.
