% heyawake 9 by ?, http://www.janko.at/Raetsel/Heyawake/009.a.htm
heyawake
hard
17 17
+---+-+---+-----+-----+-------+---+
|2..|.|...|3....|0....|1......|...|
|...|.|...|.....|.....|.......|...|
|...|.|...|.....|.....|.......|...|
|...|.+-+-+-+---+-----+-----+-+---+
|...|.|.|1..|4..|4....|.....|4....|
+---+-+.|...|...|.....|.....|.....|
|.....|.|...|...|.....|.....|.....|
|.....|.+---+...|.....|.....|.....|
|.....|.|...|...|.....|.....|.....|
+-----+.|...|...+-----+-+---+-+---+
|1....|.|...|...|.....|2|...|.|...|
|.....|.|...|...|.....|.|...|.|...|
|.....|.|...|...|.....|.|...|.|...|
+-----+-+---+-+-+---+-+.|...|.|...|
|.....|2....|0|.....|.|.|...|.|...|
|.....|.....|.|.....|.+-+---+-+---+
|.....|.....|.|.....|.|.....|3....|
+---+-+---+-+.|.....|.|.....|.....|
|...|.|2..|.|.|.....|.|.....|.....|
|...|.|...|.+-+---+-+-+---+-+-----+
|...|.|...|.|.....|1..|...|.|.....|
|...|.|...|.|.....|...|...|.|.....|
|...|.|...|.|.....|...|...|.|.....|
+---+-+---+-+-----+...|...|.+-----+
|3....|5....|3....|...|...|.|3....|
|.....|.....|.....|...+---+.|.....|
|.....|.....|.....|...|...|.|.....|
|.....|.....|.....|...|...|.+-+---+
|.....|.....|.....|...|...|.|.|...|
+---+-+-----+-----+---+-+-+-+.|...|
|1..|2......|.....|0....|...|.|...|
|...|.......|.....|.....|...|.|...|
|...|.......|.....|.....|...|.|...|
+---+-------+-----+-----+---+-+---+
