% slitherlink 188 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/188.a.htm
slitherlink
very hard
30 20
3233..3...2.....2.3..3...1233.
.2.20..3..12..2.3..2...1.23.2.
..222323.322.2.21.2.12.3..2...
..22..2..0.....1...3...2.3....
...2.112...2..23.1.1.12...22..
..22..222.2...1.3.3..3.2.3...3
23..3.........2....11.3122..13
21...13..12222....3.....221.23
...23.222...2...2..2122...2.12
.1.222.2.01.....322131.1...21.
122..3..2..312..12...2.1...2..
.3122....3...222...21.......12
..2.23..22.....21...1..1221.32
.31.221..21.222..22.2.3...221.
...2...22..223.2.1.3.212.32...
..22..3.31....222.12...2.22..1
.123..223..3.2....11.212.13.33
22..0.2.2.32..3....222......22
.213.32...213..23.32...12.1.2.
3.3.2...2....223.3.22.3..3...3
