What...The...Fuck...

Every time you pick a number, the answer is going to be a multiple of nine. Let's say you pick 52. 5+2 = 7. 52 - 7 = 45. 45 is a multiple of nine. And no matter what number you first choose, if you add them together, then subtract the result, you're ALWAYS going to get a multiple of nine. Always! So you're not going to get anything else except 9, 18, 27, 36, 45, 54, 63, 72, 81 or 90, and every one of those numbers has the same symbol, except 90, which you can't actually choose because the system won't let you. So the crystal ball is always going to show the right symbol! And each time you click to try again, the symbols for the nine multiples changes while all the others stay the same!

The first time I did it, I got 45, and the symbol that showed up was the six-pointed star. The next time, I got 45 again (on purpose), and hey presto!, this time the symbol was the smiley face! I'd picked the same number, but the symbol was different!

Don't worry smashed, this site has had people scratching their heads for months now.