Contestants play a version of tic-tac-toe by answering questions to win squares on a game board. The popular quiz show enjoyed many incarnations from the 1950s to the '90s, both in daytime and prime time, on NBC, CBS and in syndication.
1950
2006
1999
1991
2007
1990
1975
1983
1992
1998
—
1988
2021
2004
2025
1964
2003
2012
