Concentration
Concentration was NBC's longest running game show.
In addition
to its fourteen year daytime run, there were also two primetime
versions, a four week run in 1958 with host Jack Barry and a five month
run in 1961 with host Hugh Downs (pictured below). There was also a syndicated version which ran from 1973 to 1978 with
host Jack Narz.

Two players took turns to call out a pair of numbers
(from one to thirty), which appeared on a three-sided wedge on a game
board.
If the prizes (or information such as "forfeit one gift" or
"take one gift") matched, the player was credited with the
prize.
The third part of the wedge was shown when a match was made, and
revealed two portions of a slowly building rebus puzzle.
The player was given a chance to guess the answer and if correct,
would win the game and all the prizes. If not, they called out two more
numbers and tried to make another match.
When the player failed to make
a match, the turn went to the opposing player.
The winning player continued to play against other challengers until
defeated or until they won 20 games.
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