A twist on a classic!

The magician shows 3 cards (2 cups and a ball).
The magician then asks  the viewer to keep track of where the ball is, but the viewer never manages to find it.

A classic trick you can carry in your pocket and execute at any time. You can't go wrong, because it's success guaranteed.
In addition to the tutorial, you will receive a PDF with the art ready for you to print.