A NBC game show that debuted in 1958.

Also, a Milton Bradley game (with similar rules to the game show). The game is basically an memory game with a few bells and whistles:
  • Cards are arranged in a grid. One one side of each card is one of a set of pictures (there are two cards with each picture in the set). On the other side, is a number (or nothing). Cards are placed with the blank (or numeric) side up, in a random order
  • Players take turns. A turn consists of flipping over 2 cards. If they match, the player takes them, and gets another turn. Otherwise, they are flipped back, and play proceeds to the next player. When the board is empty, the game is over. The person with the most cards wins.
There are more rules - for example, certain cards cause specific events to happen when they are matched - but they're fairly unimportant to the game.