peek at solution solve puzzle
quality: difficulty: solvability: line logic only
Puzzle Description Suppressed:Click below to view spoilers
#1: Jan Wolter (jan) on May 30, 2005
This is a very hard puzzle. I know it is possible to solve by one-line-at-a-time reasoning alone, because my solver program, which only does that kind of logic, was able to solve it (I had to give it a bit of help, but that was simple line-at-a-time reasoning too). However, I had to resort to some edge logic to get it.#2: Jan Wolter (jan) on May 30, 2005 [HINT]
Comment Suppressed:Click below to view hints#3: Mark Conger (aruba) on Jun 3, 2005
I had to use boundary logic too.#4: Gitte Olesen (granny40) on Nov 5, 2006 [HINT]
Comment Suppressed:Click below to view hints#5: Arduinna (arduinna) on Feb 4, 2008 [SPOILER]
Comment Suppressed:Click below to view spoilers#6: C A (nakunarimasu) on Apr 9, 2008
ohh i love that story..#7: Marie-Louise Ambrey (marz) on Apr 27, 2008
What a challenge, I had to go and find good quality smaller puzzles that were a challenge, and voila! I found lots of your puzzles Jan, so I'm happy now :)#8: Yulia (yug) on May 7, 2008 [SPOILER]
Comment Suppressed:Click below to view spoilers#9: ErgoDyne (ergodyne) on Oct 9, 2008 [HINT] [SPOILER]
Comment Suppressed:Click below to view hints and spoilers#10: Adam Nielson (monkeyboy) on Oct 11, 2008 [HINT]
Comment Suppressed:Click below to view hints#11: Adam Nielson (monkeyboy) on Jun 12, 2009
Second time around, still just as fun. Ditto #2.#12: Byrdie (byrdie) on Oct 22, 2009 [HINT]
Comment Suppressed:Click below to view hints#13: Gator (Gator) on Dec 7, 2010 [HINT]
Comment Suppressed:Click below to view hints#14: Renee Hott (Renee) on Oct 16, 2012 [SPOILER]
Comment Suppressed:Click below to view spoilers#16: Susan (Susan) on Jul 15, 2017 [HINT] [SPOILER]
Comment Suppressed:Click below to view hints and spoilers#17: JoyLonon (Esljoy) on Feb 23, 2022 [HINT]
Comment Suppressed:Click below to view hints#18: Joe (infrapinklizzard) on Feb 23, 2022
There is no "symmetry logic". That is guessing.#19: Gator (gator) on Feb 24, 2022 [HINT]
If the entire puzzle is symmetrical, and there is only one solution, then you could use symmetry as a solving technique, but unique solutions are not a guarantee on this site.
And, more importantly, this entire puzzle is not symmetrical.
Comment Suppressed:Click below to view hints
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