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Comments on Puzzle #217: Order Out of Chaos
By Jan Wolter (jan)

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]
Fairly early on, the "5 2 2 2 2 5" row does something vital and asymmetrical.
#3: Mark Conger (aruba) on Jun 3, 2005
I had to use boundary logic too.
#4: Gitte Olesen (granny40) on Nov 5, 2006 [HINT]
Very good puzzle.
Had to use two-rows-at-a-time. ;-)
It was necessary to find out where the 3 in upper row horizontal could NOT be placed.
Luv when a puzzle is a challenge.
More of these puzzles please. :-)
#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 spoilers
#10: Adam Nielson (monkeyboy) on Oct 11, 2008 [HINT]
I had to use edge logic to solve it. I could not find any way to solve it by line logic alone. I sat and looked forever, but eventually had to move on to other techniques.
#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]
After typically starting with line logic, I used edge logic on the top three rows and the rest solved quite quickly.

Nicely rendered and clearly recognizable very early on.
#13: Gator (Gator) on Dec 7, 2010 [HINT]
The two black cells I get on row 20 not too far into the puzzle help speed things up a lot. Very nice line logic puzzle.
#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 spoilers
#17: JoyLonon (Esljoy) on Feb 23, 2022 [HINT]
All but vertical columns 11-15 can use symmetry logic. With this method, it is quickly & easily solvable.
#18: Joe (infrapinklizzard) on Feb 23, 2022
There is no "symmetry logic". That is guessing.

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.
#19: Gator (gator) on Feb 24, 2022 [HINT]
And regardless, line logic is all that is needed to solve this one. The helper only has problems with the cells in column 25 that have to be dots.

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