% slitherlink 391 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/391.a.htm
slitherlink
very hard
30 20
..1..3.232..32.2.231.3232222.3
.3......3.222....1.2..21221..2
...132.2..22..22..2......3.2..
.132.1.32.1.2..2..12212..2....
.231.....12.1..21.12.2.3.1..11
22..1.2.22..31.13..3....2.2.2.
1313...2.1.......2.11.23.22...
........2..2.12.222..22....12.
.1.22.23.32.3..1.3...12....3..
3...2.1312220.32.2..3.2.2.3.33
...3.1221.2..3.1.......23.....
22.1.22..2..1..2..122.2...03.3
2..3.....1...3..1.02.1203.....
1...1.22...1...3..1..2....2222
3.......21233...3..33...2.22..
13.132.2.22...3.....1...33....
222..2.13.2.1.23........2102..
.2....2.....22.21......1...2.3
..3212.1.31...2.1.0....3...2.2
...........33.13..3.33.122.1..
