% slitherlink 163 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/163.a.htm
slitherlink
medium
16 12
2..3222...123232
2..2.221222222..
2230.1...23.2...
.232....2...2..1
222..121....1..3
2.......2...3...
.2..3...03...121
..22....3...23..
...2..1...232.1.
22.012......2.0.
.3..2...23.22.3.
.....22.2..1.2..
