# This is very cool --

ha, i figured it out last year in a few minutes. Interestingly, I know many smart people who either couldn't figure it out, or refused to invest the effort. All it takes is some thought, and 9th grade algebra.

In any case, the application is very clever.

Hi,

Not to burst anyones bubble...
The way it works is you take the two digits from the number add them then subtract from the origional number. This allways leads to the same end result for certain sets of numbers. For instance:
99 - (9+9)=81
98-(9+8)=81
97-(9+7)=81

Its all the multiples of 9, so 81, 72, 63, 54, 45, 36, 27, 18 and 9 all have the same symbol. So matter which number you chose, it will equil one of those multiples of 9 and sense all the multiples of 9 have the same symbol it can 'predict' what you were thinking..
More examples:
12-(1+2)=9
32-(3+2)=27
58-(5+8)=45
etc...

The trick of changing the symbols each time will catch a lot of people. Neat trick that couldn't be done with a paper chart as easily!

OOOOHHHH!!! I get it, dang, I was starting to really freak out! The math part was easy to understand, but the changing the symbols each time is what got me! Very clever!