Games 4 presents an exhilarating collection of six titles tailored for the ZX81 equipped with a 16K memory expansion module. Navigate the delicate task of Lunar Landing as you expertly guide your lunar excursion module toward a gentle touchdown on the moon's surface. Test your strategic skills in Twenty One, a classic card game where cunning and luck collide in an exhilarating battle against the deck. Engage in intense aerial combat in Combat, where you maneuver your spacecraft and unleash 12 missiles to fend off relentless alien attackers. In Substrike, pit your wits against an array of submarines, deploying depth charges with precision to secure victory in a tactical grid environment. Challenge your intellect in Codebreaker, a thought-provoking puzzle reminiscent of Mastermind, and embark on a mission in Mayday to locate a lost individual adrift in a complex 7x7x7 spatial grid.