Old TV game shows were popular in the 1950s and 1960s. One of the most iconic was PASSWORD, an 8-letter word game show that aired from 1961 to 1975. Another classic was Twentyone, a 9-letter game show that aired from 1956 to 1958. I've Got a Secret was a 13-letter game show that aired from 1952 to 1967. Finally, Let's Make a Deal was a 13-letter game show that aired from 1963 to 1976. All of these shows were popular in their time and remain fondly remembered today.