Who knew tic-tac-toe on television would be such a massive hit?
First airing waaaay back in the black-and-white TV days of 1965, "Hollywood Squares" has been on the boob tube in one form or another, with one host or another, almost ever since.
But the salad days of 'Squares' was definitely the '60s and '70s, when host Peter Marshall presided over the funniest group of Hollywood has-beens ever assembled.
Here's a quick look back at some of our favorite 'Squares.'
Game Show Game
The TV show spun off from a game was so popular, it was spun off into a game.
Bert hosted a number of game shows throughout his career, including the 1965 pilot for "The Hollywood Squares."
He is best known for hosting "Miss America" for almost 25 years until he was let go in 1979.
Bert died of lung cancer in 1992. He was 77.
When the series was picked up in 1966, Parks was replaced as host by Peter Marshall, who helmed "Hollywood Squares" all the way to 1981. He later hosted the TV version of the game "Yahtzee." (Talk about being typecast.)
In 2010, Marshall, Monty Hall, and Wink Martindale starred in a Game Show Legends edition of "The Newlywed Game" with their wives.
Marshall is 86.
Best known as Carol Brady from "The Brady Bunch," Henderson was also a frequent panelist on the original "Hollywood Sqaures" in the 1970s.
The 78-year-old actress is still on the scene. She appeared on "Dancing with the Stars" in 2010 and stars in the upcoming movie, "Young One," due out next year.
Click through for some more of your favorite squares.
The Canadian singer appeared on the pilot of "The Hollywood Squares" in 1966. In the '80s she had a short stint on "The Young and the Restless" and later performed in musical productions.
In 2003 she lost her battle with colon cancer at the age of 76.
Gobel was a regular panelist on the show in the '70s. He also made nine TV movies through out the '70s and '80s.
He died in 1991 after undergoing heart surgery. He was 71.
Roddy began acting as a teen in 1941's "How Green Was My Valley?" and followed that with "Lassie, Come Home" in 1943.
He was a frequent guest panelist on "Hollywood Squares" and often came up with his own material.
He died from lung cancer in 1998. He was 70.
Barbara is best known for wrinkling her nose on "I Dream of Jeanie" in the '60s but she was also a regular panelist on "The Hollywood Squares."
Currently 77, Eden still pops up on TV here and there.
Jim was best known for his portrayal of Thurston Howell III on "Gilligan's Island" and voicing Mr. Magoo.
The comedic actor suffered from Parkinson's Disease for many years before falling ill with pneumonia in 1989. He passed away at age 76.
Joan is a staple on E! these days, but she used to be a staple on "The Hollywood Squares" in the '70s. The 78-year-old comedian also appeared in the '80s version of the show.
The actor has appeared in dozens of films and TV shows and has recorded countless comedy albums. He also regularly appeared on "The Hollywood Squares."
He famously voiced Papa Smurf for the TV series "The Smurfs" in the early '60s and later in the film adaptation in 2011.
The 86-year-old comedian was awarded the Mark Twain Prize for American Humor in 1999 and a TV Land lifetime achievement award in 2008.
Amsterdam had his own show in the late '40s, and is best known as Buddy Sorell on "The Dick Van Dyke Show." He was a panelist on the pilot of "The Hollywood Squares" and continued on the show when it premiered in 1966.
He appeared on several episodes of "The Young and the Restless" in the '90s before dying of a heart attack in 1996. He was 87.
Of all the stars of 'Hollywood Squares,' Lynde shined the brightest. The all-important center square from 1968-1981, Lynde often held contestants' fate in his hands.
Also known for his role as Uncle Arthur on "Bewitched," Lynde was 'Squares' undisputed superstar, and even won two Emmy awards for his work on the show. Lynde was so popular he even got his own (short-lived) sitcom in 1972.
Lynde died of a heart attack in 1982.
Before there was 'Celebrity Apprentice,' fading stars showed off their skills on 'Hollywood Squares.'