Mystery House
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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 Ho
1982 re-release cover art
Advertisement from the June 1981 issue of The On-Line Letter for some of On-Line Systems' Hi-Res Adventure games, including Mystery House
Apple IIGS running Mystery House
Kenneth A. Williams is an American businessman and game programmer who co-founded On-Line Systems together with his wife Roberta Williams. On-Line Systems eventually became Sierra On-Line and was ulti
Williams in 2022
Williams addressing a crowd at a celebration of the On-Line Systems' first anniversary in 1981
Ken Williams at a celebration of On-Line Systems' first anniversary, 1981