"The Golden Years of Broadcasting - A Celebration of the First 50 Years of Radio and TV on NBC"

By Robert Campbell

"Nine stars, host Peter Marshall, two contestants, rich prizes, and a barrel of one-liners have made the Hollywood Squares TV's most popular quiz show.  It is seen daily, Monday through Friday, as well as twice weekly in the evening.  First prize is a car, but the success of the show rests with its rotating list of stars, the favorite of whom is Paul Lynde."
  

 
Dinah Shore, Paul, Shirley Jones
 

The photo below is not from this book but I'm including it here, since it
appears to have been taken the same day as the above photo, but at the
opposite end of the grid.  You can tell from the colors of the clothing that
the same people are in the same squares.  You can also tell it's not just
a "flip" of the photo since the stairs on the left in the photo above
are the ones that lead to the 2nd level while the stairs on the
right below, lead to the third level.