Mystery Theme VI: Topic Occluded by KlionskyG

Question 13

Like in the Google quiz, here's a question that's not really part of the quiz. Don't money this question.

You can feel free to leave this blank if you like, no one's getting points for it. But if you want to describe your approach to getting the theme, go ahead, type it in.

(It's hard to judge tone online. This really really is not a hint or a clue or anything, I just like the idea of this open-window 13th question.)