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Sierra Entertainment, Inc. is an American video-game developer and publisher founded in 1979 as On-Line Systems by Ken and Roberta Williams. Based in Oakhurst, California and later in Fresno, California, the company was owned by Activision, a subsidiary of Activision Blizzard.
In 2008, Sierra Entertainment was absorbed by its parent company, Activision. However, on August 7, 2014, the once defunct website for Sierra was revived sporting a new logo and a message hinting at new projects to be announced.
- King's Quest
- Geometry Wars 3: Dimensions Evolved
- Velocity 2X