Sheldon's Experiment

Let the audience cover a row of numbers with a match and instantly announce their sum, regardless of vertical, horizontal, or diagonal placement. The position of the match can be anywhere: at the top, bottom, or middle. The result is always accurately determined. You can even let the audience place the match diagonally and leave the room, or blindfold yourself while still correctly announcing the result! This trick is very simple to perform and can be repeated anytime.

You will receive a plastic board and detailed instructions from us.