% slitherlink 359 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/359.a.htm
slitherlink
hard-
20 15
..2...1.......232...
2301..3.123.3221.1.2
...2..10....223..3.1
..3..2212..3....222.
2.2..2.3..1.0231.2..
31.1..21....1...3..2
..2..22..3.3..32....
132.2...2....1.21221
.22...12.3.33.0...2.
....1.2.3.12.3..12.3
.3.3.....1..22.2....
..2.213..212...1..13
..2.2.2.2..22..1.3..
....2.2..2...2.23.12
3..2.31.2232..3..33.
