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Started laughing out loud at the recursively smaller stop sign squares

Can't get past this one. I see two stop signs and have recursed the squares, but can't solve? Is there are third stop sign?

For me it was very sensitive to even one red pixel from a sign not being selected

It's also incorrect: there is the back of a stop sign visible on the left of the picture but you must not select this to pass the level.

Par for the course with these captcha-like tests though.

Thanks. That was it. You are *NOT* supposed to select any part of the back of the stop sign to the left of the picture.