I Remember Concentration Game Allows users to download a copy of "I Remember Concentration", a PC game that recalls the game show of the sixties and seventies. http://home.primus.ca/~dan.brennan/

IMDb: Concentration Information about game show that used two contestants who tried to solve the puzzle first. Show ran from 1958 to 1979 using various hosts. http://www.imdb.com/title/tt0197146/

Concentration Images Features show commentary and host images of Bob Clayton and Hugh Downs. http://home.earthlink.net/~crussmason/cncphot.htm

James Vipond: Concentration Historical information the game show, includes the rules, the hosts, the models, Bob Clayton, and a photo gallery. http://web.itctel.com/arlateo/gameshow/Concentration.html

The Classic Hollywood Squares Site A site devoted to the 1966-81 Peter Marshall version of the series, with pictures, biographies and classic "zingers". http://www.geocities.com/screenjockey/classicsquares.html