This kinda weirded me out!

What the !@#%$ ?

How do it know?

That is bizzare, someone explain how that works, there has to be a scientific explanation.

Omg how did that do that to strange!

I went through it 5 times. It was right the first 4, then on the last time I deliberately looked at the wrong symbol - and it still got it right!!!!!!

That is quite strange. Maybe it works better on simpletons like I.

Cool trick! It took me about four times through before I caught it!

Choose four different numbers to start. In the end when you choose the symbol, all of the second batch of numbers have the same symbol - in my case: 18, 27, 81, 36.

They switch the symbols around each time to confuse you...it's a different symbol that you're staring at rather than the same symbol so it takes a bit. In my case, I had problems finding 81 which made me catch the duplicate symbols. Then I had to do it one last time to verify what I thought I saw!

Always a multiple of 9.