% slitherlink 506 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/506.a.htm
slitherlink
hard-
24 14
.33.3..........3.13.322.
2.2123...13232.223221.2.
...131.2222222.2....3...
....322.2.2313.12321..31
.2131......22..3..1..2..
.112.312302.13132...1211
.2.21...311.23.3....3...
.2.22...3.3....1122....2
.2.232...1.232...223122.
..2.11..2..1....11..2.1.
12...21.12.1.2..22..1.2.
2222111.2..322...1.2...2
22..2.2...2..3133332...3
22....2....3......2232..
