This is a pretty cool game:
Flash Mind Reader
Read the directions carefully, see what symbol represents the number you come up with, and click the crystal ball.
I actually looked online to see how they did this.
Don't read until you try to figure it out yourself!!!
Here is a simpler explanation (highlight to read):
Every answer to the formula is a multiple of "9" - 18, 27, 36, 45, etc
The symbols are randomized every time,
but the multiples of 9 always show the same symbol.
This symbol will be the answer.