From Wikipedia This video game cartridge simulates the game of Tennis. There are four points per game, and six games per set. Player-set variables including curve balls, net rushing, handicapping, and varying skill and speed settings allow for as many as 96 variations in gameplay. Pre-defined game modes such as "Bounce-Back" are also available. User summary The game cartridge was manufactured for the VideoBrain, a 1977 (fairly unsuccessful) entrant in the personal computer market manufactured by Umtech Incorporation.