% slitherlink 179 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/179.a.htm
slitherlink
hard-
20 15
.13..33.3..3.1.3.33.
3....202.11...21...1
3..122.2...31..3....
.3....12...3..10.111
3...1..22.1..3......
.3..2312.1.2.22....2
....2.22....21.2.13.
2..12..1...2.......1
321...222...21..23..
23..131..2....22..1.
22.3....232....3.2..
....3.21...12...032.
113....222....1.3..1
.........202......32
3.3223..2...221.....
