% slitherlink 394 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/394.a.htm
slitherlink
very hard
30 20
2.......2......23.222...23....
.3.2.2.3..2....212.3..2.2..323
2.23.23...322.23.32..2322..1.3
.2..2.112.2...2....2..22...12.
.2.321.2.2.12.3.....2...223322
..11.222........2.2..2212...12
.1....2.03.2.22...3...2..2.2.2
..213..3..233.3.0.111.113.22..
22.....0..21.1.2...2.3...12..2
3..2.2....1..3.3132221..00.12.
.221..1....21.22..12....2....3
.1..231..12....2.....21...3...
.12.1...........2.2.233..2..32
..3.3.222222202.333.....2..2..
223.2.3.3.12.332.12...11....3.
...2.312..33..1.12.232....3312
3.1..3...1.022.2.22.1...3..2..
.2..2.....32...2.2.1...2313..1
3.212.22...2.....2....22...1.2
...32.33.23132..3...3....33...
