The game was really simple since it was based on tic-tac-toe. But what made the show stand out was the humorous bluff answers from the many stars who sat in the nine boxes throughout the show's 15 year run. Among the many celebrities who appeared on the show were Wally Cox, Cliff Arquette (as his Charley Weaver character),Rose Marie, George Gobel and in the center square, Paul Lynde. His quips were very funny and rescued the show from a slow start into a very funny show.
Heatter-Quigley made the right choice in hiring Peter Marshall over Bert Parks as "The Master of the Hollywood Squares." Though he never hosted a game show he got better and better throughout the run and it paid off with a couple of Emmys.
I really enjoyed the show, even the nighttime syndicated version that aired once (later twice) a week. It was a true game show classic and X got the square.