21 is a video game released in 1982 that simulates the popular casino card game Blackjack. Players can enjoy the thrill of trying to beat the dealer and reach a total of 21 without going over. The game features simple graphics and intuitive controls, making it easy for players to jump right in and start playing. Whether you’re a seasoned Blackjack player or just looking for some casual gaming fun, 21 is sure to provide hours of entertainment.