Concentration is a TV game show based on the children's memory game of the same name. It aired on and off from 1958-1991, hosted by various hosts and played in various ways. The property has been seen in several different versions: ..... Two computer versions of Classic Concentration were released by Softie for MS-DOS systems, as well as the Apple II and Commodore 64. A Nintendo Entertainment System version was also released by GameTek. Tiger Electronics also marketed a hand-held version of the game in the late 1990s, complete with the Narz-era theme and the 1960s-1978 logo. Source: Wikipedia, "Classic Concentration", available under the CC-BY-SA License.