% slitherlink 280 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/280.a.htm
slitherlink
hard-
16 12
......1..13.32.2
021.2.22..1....1
...031..3...3.1.
1.....3..1.1.3.3
..0...0.0.3.....
1.2.1....112..23
31..1..2......2.
.11.3.3..3.1....
1.22....22.11.3.
....112....2...2
21.2.1.1.....3..
.3.2.3..0.33..21
