Doors (1979)

Publisher statement In this cute little game, there are several doors in succession and you must open them to get the prize behind the last one. You have a key ring containing a random number of keys and you have a random number of tries to open all four doors. As an added hooker, some keys may open more than one door. If at first you don't succeed, try, try again. The prizes behind the fourth door are well worth the patience in trying to get them all open. Doors was conceived and written by Bill Ingram.