peek at solution solve puzzle
quality: difficulty:
solutions: multiple solvability: some guessing
Puzzle Description Suppressed:Click below to view spoilers
#1: Robyn Broyles (ginkgo100) on Jul 27, 2009 [HINT]
Symmetry logic can finish it, but there are two possible solutions.#2: Web Paint-By-Number Robot (webpbn) on Aug 25, 2009
Found to require some guessing by Gator.#3: Gator (Gator) on Aug 25, 2009 [HINT]
Technically four solutions, but who's counting when there is more than one.#4: Andrew Schultz (blurglecruncheon) on Jan 5, 2024 [HINT]
EDIT: Actually, a lot more than 4, but I'm not going to count them all.
Alt solutions: R17C20 black gives 4 possible solutions, C11-12 R16-17 and C14-15 R16-17 can be flipped
R19C20 black gives contradiction
R20C20 makes the center bit an upside down umbrella
So I count 5.
Fortunately the "right" one is pretty easy to see! A nice puzzle if we don't mind the end ambiguity. (I'll allow it!)
Show: Spoilers
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