Sierra Entertainment Inc, (formerly Sierra On-Line) was a Worldwide American video game developer and published founded in 1979 as Online Systems. Based in Los Angeles, California, the company was last owned by a subsidiary of Activision Blizzard (a subsidiary of Vivendi SA) Sierra is best known today for its multiple lines of seminal graphic adventure games started in the 1980s (notably King’s Quest, Space Quest, Police Quest, and Quest for Glory), some of which proved influential in the history of video games.
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