% slitherlink 616 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/616.a.htm
slitherlink
hard-
24 14
1....33....21....13....2
.13.....2......3.....03.
3..11...0.3..3.3...31..1
.3....31..3..0..13....2.
.2..3......31......3..1.
..3..2..11....03..3..3..
0..2..1...3..2...2..2..1
2..3..2...3..0...1..2..2
..0..3..02....21..0..3..
.1..3......12......3..3.
.2....12..2..0..22....2.
3..20...0.0..3.3...30..3
.21.....3......1.....32.
2....12....20....10....2
