Haunt was a straightforward but engagingly irreverent text-based mainframe computer game. It was created in OPS4 language in 1979 by John E. Laird. In Haunt, the player explores a haunted house and encounters clues (flight speed of an African swallow), wacky creatures (rampaging moose), and random elements (the bus) as s/he tries to find treasure and escape the house alive. In 1998 the source code of the partly ported version was given to the Interactive Fiction Archive for publication.