UFO-Detektor (Magnetfeld-Detektor (Scherz))

Behind the above title lies a well-known type of dexterity game, in which two players each attempt to pass a ring along a length of wire without touching it. The first player to reach the end of the wire is the winner. If however a player`s ring should happen to brush the wire, an LED lights, indicating that he must go back to the start and begin again.