<P> Many celebrities became recognized as regulars on the show . Some regulars were frequently asked questions pertaining to a certain topic or category . For instance, Cliff Arquette (in character as "Charley Weaver"), a history buff, excelled at American history questions; Rich Little almost always received questions about other celebrities, which gave him an opportunity to do an impression of that individual; Roddy McDowall usually gave correct answers about the plays of Shakespeare; Rose Marie often received questions on dating and relationships, playing off her lovelorn comic persona; and Demond Wilson often responded with mock anger to questions that were carefully worded to play upon African American stereotypes . </P> <P> Other regulars and semi-regulars over the years included Nanette Fabray, Kaye Ballard, Wally Cox, Morey Amsterdam, Florence Henderson, Buddy Hackett, Marty Allen, Wayland Flowers and Madame, Barbara Eden, George Gobel, Vincent Price, Charo, Sandy Duncan, Carol Wayne, Jonathan Winters, Foster Brooks, The Lennon Sisters, Garrett Morris, Karen Valentine, John Davidson, and Joan Rivers . </P> <P> Paul Lynde was featured in the tactically important center square throughout most of the show's original run . In 1968, after two years on the show, Lynde became the regular center square . Lynde's outrageous jokes helped him win two daytime Emmy Awards both in 1974 and 1978 . He left the series after taping the August 20--24, 1979 week of shows, but returned when the series relocated to Las Vegas for the 1980--81 season . </P> <P> The Secret Square game is played as the first game on a given broadcast (or the first complete game, if a show began with a game already in progress) during the daytime series . In this game, a randomly selected Secret Square is shown only to the home audience by the shot of the television camera . A contestant who picked that panelist during the game won a bonus prize package if they correctly agreed or disagreed with the star . Secret Square prize packages added cash on the daytime edition, which started at around $1,000 (for the 1966 episodes; the base amount increased in the later years from 1967 to 1980 (by which time a new Secret Square package was worth around $3,500 to $4,500) and grew daily until won . The question for the star was sealed in a special envelope and was almost always multiple choice . </P>

Who was the center square on hollywood squares in the 70s