Puzzle Description:

a turtle coming out of the sea to lay its eggs on the beach

#1: Amy (awar) on Feb 27, 2013

Really liked!!

New version published by MrsSpille.

Very nice. I liked your use of color.

After initial LL & CL, there are two patches of green left, each of which can be solved separately. Let's concentrate on the left one.

One thing that may not get us any further, but is interesting to note is the 4 in r7. There is one pixel fixed in c5. Edge logic shows that that pixel must be one end or the other of the 4; it cannot be in the middle. (If the 4 were to cover both c4 and 6, there would be no room for the 3 in r10).

Well, it kinda helped. It isn't necessary, but it focused my attention on that row.


Do extended edge logic on the 4 in r7. Instead of looking at the green pixels, we're going to look at what the dots force.

If the 4 were to go all the way right, it would force r7c2-4 to be dots. Those dots then force both the 4s in c2&3 down into c11, creating a conflict.

Therefore the 4 in r7 cannot be all the way to the right and r7c8 must be white. Then the rest of the left side solves with line logic.

The right side solves exactly the same way, but mirrored. (If the 4 in r7 is in c21-24, then the dots in c25-27 force the 4s in c26&27 down into r11 causing a conflict. So the 4 cannot be in c21 and the rest solves with line logic.)

So, moderate lookahead, but difficult to find.

Found to be solvable with moderate lookahead by infrapinklizzard.

Goto next topic

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