Sierra Entertainment, Inc. (formerly Sierra On-Line) is an American video game developer and publisher founded in 1979 as On-Line Systems by Ken and Roberta Williams. Based in Los Angeles, California, the company is currently a subsidiary of Activision Blizzard (a subsidiary of Vivendi SA). Sierra itself owns four in-house development studios: High Moon Studios, Massive Entertainment, Radical Entertainment and Swordfish Studios. Sierra is best known today for its multiple lines of seminal graphic adventure games started in the 1980s (notably King's Quest, Space Quest and Quest for Glory), some of which proved influential in the history of video games.
Sierra is best known today for its multiple lines of seminal graphic adventure games started in the 1980s, some of which proved influential in the history of video games. The Sierra label was absorbed by its parent company. Some franchises that were published by Sierra will be published by Activision, which also announced in 2008 that it may sell the Sierra brand.
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