On all my last visits to what was the Museum of Television & Radio in New York City within the last five years, I have seen within their collection including actually watching...
"The $20,000 Pyramid" (2/26/1979...with my own name attached to it in its database listing)
Four "Concentration" episodes (1958 Hugh Downs, two 1971-72 Bob Clayton's and 1974 Jack Narz)
Two "The Price Is Right" episodes (1958 Bill Cullen nighttime, 1982 Bob Barker daytime)
"The Money Maze" (1975)
"I've Got A Secret" (10th Anniversary 1962 episode)
"To Tell The Truth" (1967 nighttime finale)
"Password" (1963 nighttime episode)
"Eye Guess" (1967-68)
"Jeopardy!" (1972, 2000th broadcast)
"On The Spot" (KGW-TV Portland, Oregon local show-1980's)
"Tattletales" (1982)
"Match Game" (syndicated 1981 episode)
"Match Game/Hollywood Squares Hour" (1983)
"Gambit" (1976 episode)
"To Say The Least" (1978)
"Wheel of Fortune" (1976 Tournament episode)
Also, and it is game show-related, a 1978-79 primetime special called "The 1978-79 Television Annual" that had a montage of clips in that genre introduced by Dick Clark. In addition, I have checked and looked at the 1979 Daytime Emmy Awards where host Bob Barker announces that he was disqualified for his nomination as Best Game Show Host (Dick Clark won the award instead).
Another great must-see example is the 1981 Daytime Emmy Awards presentation in their collection, where Peter Marshall (Best Game Show Host, "Hollywood Squares"), Bob Stewart (Best Game Show, "The $20,000 Pyramid") and Mike Garguilo (Best Game Show Director, "The $20,000 Pyramid") each accept their trophies in light of the fact that their respective shows were cancelled by the networks. Stewart himself jokingly remarked, "This is the second award we have won since we have been cancelled. We have won more awards off the air then we do on the air, which tells you something."