Hacker is a 1985 computer game by Activision. It was designed by Steve Cartwright, produced by Brad Fregger and was released for the Amiga, Amstrad CPC, Apple II, Atari XL/XE, Atari ST, Commodore 64, Macintosh, MS-DOS, MSX and ZX Spectrum. The game was released two years after the release of the film WarGames, when computer hacking and computer security were in the limelight.
The player takes the part of a hacker, a person experienced in breaking into "secure" computer systems who accidentally acquires access to a non-public system. If they can hack in, they can gain control of nifty gadgets and access a secret global network. The game was shipped with minimal instructions to get the game going, but no information on how to play, thus building the concept that the player did hack into a system.