How does this work ? The funny thing is I clicked on the ball without thinking of anything and it still comes up with a symbol. If it came up blank i would have really been impressed :)
I actually know how this works. XD If you want to carry on being mystified, please skip over my comment!
Every possible product is a multiple of 9. If you look at the chart, all the multiples of 9 share the same symbol. So really, it can never be wrong so long as you do the math properly!
I can see that and I was mentioning that if they could have made it so that if you didn`t actually think of any number ( like I did) and it came back blank, that would have really been cool. But ofcourse thats impossible :)