% slitherlink 428 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/428.a.htm
slitherlink
medium
16 12
3..2..33.212..2.
2....3....232..2
1.2302.3....23.1
.3..2....1..211.
2.22212..1..2.1.
.32...122003.322
3.122..2.2..1.2.
1..31...13.3.3..
2...22...22...22
..2..02...323..1
.2.3...2...222..
.1..23....22....
