Sierra On-Line, Inc.

Founded in 1979 by Ken and Roberta Williams as On-Line Systems and renamed Sierra On‑Line in 1982, the company operated from California (initially Simi Valley, later near the Sierra Nevada). Primarily a developer‑publisher of personal‑computer titles throughout the 1980s and 1990s, it is best known for its line of graphic and text adventure franchises created and stewarded during that period. Key people include the Williamses; notable releases associated with the firm include early graphic adventures such as Mystery House and the later King’s Quest series. The game entries below, including versions and later rereleases grouped in this archive, span systems such as Windows, DOS, Amiga, Apple II, Commodore 64, Atari ST, Atari 8-bit, ColecoVision, MSX, and PlayStation.