Activision released Hacker in the year 1985; it's an old simulation game, part of the Hacker series.
Hacker is abandonware, runs on DOS and can be played in single player mode.
It's available for download.
Facts, trivia and collector's notes are licensed under the GNU Free Documentation License. These texts use material from this Wikipedia article.
Since the game doesn't possess a save game feature, a player who fails must start again from the beginning to try to solve the game's puzzles.
players: single player
sound: PC speaker
Abandonware DOS popularity: low