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This is a an awesome trick that will surely amaze your friends.
They will be thinking for a long time and wondering how this app can read your mind.
Instructions:
Tell your audience to picka number from 10 to 99. Than add both digits together. Then they subtract that number to the original number they chose in the begining. Take that number and look at the chart, remember the symbol next to that number. Finally, rub the ball and the symbol they memorized will appear in the ball.