 Mystery Mansion (video game)

Mystery Mansion is the name of a text-based adventure game written in 1978–1981 by Bill Wolpert while at the Naval Undersea Warfare Center in Keyport, Washington.It originally ran only on the HP HP-1000 minicomputer on the RTE (Real Time Executive) operating system, but was later ported by persons unknown to run under MPE (Multiprocessing Executive) on the HP-3000.