Puzzle Description:

#1: Web Paint-By-Number Robot (webpbn) on Dec 15, 2010

Found to be logically solvable by Gator.

Two-way logic for this one. Look at either column 2 or 4, or row 2 or 4.

Thank you Gator. Nice one.

Very cool, Gator. I was hoping you would make one that would challenge us to think. :-)

nice 5x5
i can see a butterfly

Or tilt your head to the right, and it's a spinning top :)

Thanks all.

very nice.

Leave it to Gator to make a Puzzle out of a 5x5. :)

Tricky puzzle for a 5x5...very nice!

nice and challenging. i tilted my head to the left and saw a buxom woman wearing a fur hat.

I guess I'm not very creative, all I see is a kite...

Nice and challenging.

Or really small (black?) hearts in a pattern. :)

Thanks Diana!

It could be the board to a game I've never heard of.
Nice challenge, Gator.

Wow! I'm glad I'm not the only one who thought it was amazingly hard for a 5x5. Nice quilt block.I think it would be easier to make with fabric than it was here. :) It was fun, though.

Thanks!

Didn't seem logically solvable to me. But then, that may be just me...

Brian, it's on the edge of moderate-lookahead/deep-lookahead. Let's call it extended two-way logic.

Look at the 2 in c2. it can go in either r3-4 or r4-5.
If it goes in:
r3-4: that forces a white in c1r3 which forces the 2 in c1 up into r1
r4-5: that forces a white in c1r5 which forces the 2|1 in c1 into only one position.

Either way, c1r1 must be black.

Then the same thing can be done (rotated) on the 2 in c4.*

Then LL to finish.


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*Actually it can be done on any of the internal 2s -- the ones in c2, c4, r2 or r4.

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