% slitherlink 357 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/357.a.htm
slitherlink
hard-
20 15
..2..33.222.2...202.
2......32.......22..
3..2.31.1..2222...2.
..3.312.12.2..1.231.
211.2...2..112.2.2..
.22.21..12..2.32.1.3
.1...11.3.3.3..1..1.
..3..2..2....1..222.
021..31.23..3...322.
.32.1..2213....21.2.
..3.2...31....1.2210
2.2....2.2.20.32....
1...2133.....3.01213
..2..121.2311...2...
222..2.......3...2..
