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Current company logo unveiled in 2014

Former logo used in 1982-2008

The Sierra Studios logo as seen when starting the Counter-Strike Beta before Valve's "open your eyes" tagline.

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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.

Sierra Entertainment published and distributed Half-Life, which the mod Counter-Strike is based on.

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
  • Shiftling
  • Velocity 2X

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