I'm debating whether to expose how it works.....
If you don't want to know, skip this explanation and go to next post:
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There are only 8 possible answers to the math question they ask you to perform (81,72,63,54,45,36,27,18)
If you notice, the symbols next to those numbers change with each time you click the round button to see if their image matches yours. If your math is correct it will always be whatever the symbol is next to those numbers, notice they are all the same.
Try it and make note of the changes. The other symbols always remain the same to throw you off.
Hope I didn't spoil anyone's fun.