% slitherlink 224 by Oleg Andrushko, http://www.janko.at/Raetsel/Slitherlink/224.a.htm
slitherlink
very hard
36 20
..3..2.....31....33....13...1.1..1..
.0..3.3..21....32..33....13..2.3..3.
3..0..1.3...21........30...2.0..2..1
........1.1.....3..0.....1.0..1.....
.221...2..2.1.33....13.1.3..1...333.
2....2.1.1.......03.......3.1.0....1
1....0...3.2.20.3..2.31.0.1...1....0
3.3.2.3....0............3....3.3.3.2
....3.1...2..3..3202..2..2...0.1....
.3.0....0...2..2....3..1...0....3.3.
.1.1....3...0..3....1..0...3....2.1.
....0.1...3..3..2311..3..3...1.1....
2.1.3.3....2............3....3.1.1.0
0....1...2.3.13.1..3.30.2.0...3....1
2....3.2.0.......31.......3.3.3....2
.231...2..2.3.20....32.3.2..3...013.
.....3..2.0.....3..3.....3.0........
1..3..1.0...02........13...2.2..3..0
.0..2.2..22....03..33....33..1.3..3.
..3..0.2...20....12....13.....2..3..
