Five hundred years old and still harder than it looks.
A wooden handle with a cup on one end and a tethered ball on the other. The goal is simple — swing the ball into the cup. The execution is not. Examples of this game have been found all over the world dating back to the 16th century, and people are still missing on the first try. No batteries, no screen, no mercy.
Details:
Looks easy. Isn't.