% slitherlink 662 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/662.a.htm
slitherlink
medium-
10 10
3.223..1..
..1...2.3.
2.221.1...
.2133.13..
......2.23
..1...2113
...3.....1
22..2.22.2
22..31.3..
.3.1.3..2.
