Crossfire
C64 · 1983
Publisher archive · Commodore 64
Sierra On-Line Games
Browse every Sierra On-Line title currently catalogued by Cheeky Commodore Gamer. New games are added here automatically when their publisher credit is present in the main game database.
2 games
2 C64
1983–1984 years covered
Source-backed publisher profile
Evidence reviewed 12 Aug 2026About this publisher
Sierra On-Line grew from Ken and Roberta Williams' On-Line Systems and became one of the most influential computer-adventure publishers of the 1980s and 1990s.
Documented company facts
- The Strong records Ken and Roberta Williams founding On-Line Systems in 1979.
- The company's first game, Mystery House, appeared in 1980 and combined text with graphics on the Apple II.
- The business moved to Oakhurst, California and was renamed Sierra On-Line in 1982; King's Quest followed in 1984.
Archive strengths
Evidence sources
The history is taken from The Strong's donated Ken and Roberta Williams Sierra On-Line collection.
2 games shown
Game archive
Sierra On-Line on CCG
2 C64 · 1983–1984
No games match that search.