% slitherlink 666 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/666.a.htm
slitherlink
hard-
17 17
22.1....32...2.23
..3..1231..312.3.
....2.....2..2..2
12.21..2.2..3..12
3.221......1.1233
.13...2...3.3.2..
.32..21..12..2..3
.2.22..1..23....3
..2.232....3....3
3.1.13022.2....0.
2........122.2.23
...213..32......2
...3..11.3.....2.
31.12..2..22.13.2
222......3...223.
.2231..2.....1..2
.21.312222..3.23.
