Hacker II: The Doomsday Papers is a 1986 computer game developed and published by Activision. It is the only sequel to the 1985 game, Hacker. It was released for several platforms of the home computer era. As with the first game, it was designed by Steve Cartwright.
Source: Wikipedia, "Hacker II: The Doomsday Papers", available under the CC-BY-SA License.