Sierra Entertainment

Sierra Entertainment Inc. (formerly Sierra On-Line) was an American video-game developer and publisher founded in 1979 as On-Line Systems by Ken and Roberta Williams. Based in Oakhurst, California, the company was last owned by Activision, a subsidiary of Activision Blizzard. Sierra is best known today for its multiple lines of seminal graphic adventure games started in the 1980s, many of which proved influential in the history of video games. Th... More

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