ok heres how to do it. theres numbers from 1-99 on the left pick any two didget number. Add the didgets together and then subtract the sum from the original number and fund the original number on the left side, memorize the sign right next to it and then click the magic ball and it will tell u what u picked.

example u pick 53. do 5+3 and then subtract 8 from 53, u should get 45 right? right. look at the sign next to 45 and memorize it and click the ball. it will show u the sign u memorized.