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Comments on Puzzle #22508: Alternation
By Joseph Newton (Shroomyjoe)

peek at solution       solve puzzle
  quality:   difficulty:   solutions: multiple    solvability: some guessing  

Puzzle Description Suppressed:Click below to view spoilers

#1: Joseph Newton (Shroomyjoe) on Aug 2, 2013 [HINT]

There are several solutions! One is correct! If you find it, see how many others you can find. I found 3.

Also, think about rotational symmetry.
#2: Kristen Vognild (Kristen) on Aug 4, 2013
Ugh. I found two, since the first pattern I tried wasn't the correct one.
#3: Joe (infrapinklizzard) on Aug 4, 2013 [HINT]
Edge logic on the 2 in r1 makes c1 & c6 white.

Now there are only three places to put the 2 in r1. Each position leads through line logic to one solution. All three are different, though the c2-3 and c4-5 solutions are mirror images.

Good try on the "spin", but a multiple-solution puzzle is more a bug than a feature.

There are a maximum of three guesses for the careful solver, but there's absolutely no hint (not even the dreaded symmetry or picture "logic") to help with the choice.
#4: Web Paint-By-Number Robot (webpbn) on Aug 4, 2013
Found to require some guessing by infrapinklizzard.
#5: Tom O'Connell (sensei69) on Aug 6, 2013
is more than one solution the new norm?
#6: Thomas Genuine (Genuine) on Aug 13, 2013
I think I made four or five different solutions, but it's possible there was similars of them. It's sure there must be at least 3. Grats for this wrong puzzle. :)
#7: Joe (infrapinklizzard) on Aug 13, 2013 [HINT]
There are exactly three solutions. One for each position in which the 2 in r2 can go.
#8: Joseph Newton (Shroomyjoe) on Aug 14, 2013
It does not matter wether or not you get the correct solution. But if you find all three, then you have the correct solution anyway.
#9: Ki Bitzar (kibitzar) on Nov 25, 2016
Yes, exactly 3 solutions. Once a valid position for one of the 2's on the edges is fixed, there is no way you can get out of the path to the corresponding solution.
#10: Andrew Schultz (blurglecruncheon) on Jan 22, 2024 [HINT]
I found this clever, but all the same, a 15x15 version might drive me up the wall.

All 3 pictures look neat too. But I can see how it might not be to many people's liking. (I admit, I used helper. But the title does give a clue what's up here.)

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