% slitherlink 390 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/390.a.htm
slitherlink
very hard
30 20
3.3.3.22..3..3..3.2..2...2...3
22......33....1.2.33...3.2.2..
..21.1..2.....1.1..2131..1.212
3..2223113..12.302..21222...3.
.13...222....32...2..3.22...1.
.3201..2.3.11..2...10...22222.
..2......3..2.....1...3....2.3
..1.213......23....1....2....3
..232..12....222..22323.33..2.
..2222.....2...2....23....2.12
.222.3.32.2.2.3...1....3...2.2
2.......1...2.3......3..32.11.
2....333.1.131...3......31..11
..1.2....1.....22.1213..1.122.
3.131..23....2202......3..1...
..22.1....3322.2.23..11.0.2.22
.....3.1.3...3.1.......32.....
2....0..2....223131.2.211.221.
.30.32..2...2.2.2...1.13..22.3
...3.1....2132..2.12..3.....2.
