Mystery House

Mystery House
1982 re-release cover art
DeveloperOn-Line Systems
PublisherOn-Line Systems
DesignerRoberta Williams
ProgrammerKen Williams
SeriesHi-Res Adventures
EngineADL
Platforms
Apple II
Release
May 5, 1980
  • Apple II
    • US: May 5, 1980
  • PC-88, PC-98
    • JP: April, 1983
  • FM-7
  • iOS
    • WW: March 10, 2009
GenreAdventure
ModeSingle-player

Mystery House is an adventure game released by On-Line Systems on May 5, 1980. It was designed, written and illustrated by Roberta Williams, and programmed by Ken Williams for the Apple II. Mystery House is the first graphical adventure game and the first game produced by On-Line Systems, the company which would evolve into Sierra On-Line. It is one of the earliest horror video games.