I was hoping I could say zero, due to the figure being in actuality not quite square; but nerd that I am, I downloaded the image and checked it in The GIMP, and it does, in fact, appear to be square (to the nearest pixel).
I did actually. I did really get a total of 39, but I posted my comment a bit tongue in cheek. Thank you for taking it seriously though, and I think your answer was the most logical possible guess. Other than that, it's probably not possible for anyone to figure out which square I missed. I'm guessing there's an answer key on the net somewhere, but I'm off to other pursuits right now.
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