Sierra On-Line
The Golden Age of Graphic Adventures and PC Narrative Heritage
Sierra On-Line was an American video game developer and publisher founded in 1979 by Ken and Roberta Williams. Operating out of Oakhurst, California, near Yosemite, Sierra defined the golden era of graphical PC adventures with franchises like King's Quest, Space Quest, Police Quest, and Leisure Suit Larry, while publishing landmark titles like Valve's Half-Life.
The AGI Engine and the Sierra Family
Sierra engineered the Adventure Game Interpreter (AGI) and subsequent SCI systems, establishing a flexible scripting platform for 16-color PC adventures. The studio fostered legendary creator personalities including Al Lowe (Leisure Suit Larry), the 'Two Guys from Andromeda' (Space Quest), and ex-police officer Jim Walls (Police Quest).
Corporate Sale, Accounting Scandal, and Legacy
Expanding rapidly into an international publisher that funded Valve's original Half-Life, Sierra was acquired in 1996 by CUC International. In 1998, a massive accounting fraud scandal at CUC forced corporate liquidations, leading to the gradual closure of Sierra's historic studios.