
Sierra Entertainment

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 is owned by Activision.






Published Game | Date | Score | Platform |
---|---|---|---|
Bourne Conspiracy, The | Jun 3, 2008 | 81 | ![]() ![]() |
Half-Life | Nov 19, 1998 | - | ![]() |
King's Quest | Jul 28, 2015 | - | ![]() ![]() ![]() ![]() ![]() |
TimeShift | Oct 30, 2007 | - | ![]() ![]() ![]() |
Velocity 2X | Sep 2, 2014 | 78 | ![]() ![]() |
Anticipated
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Hell Is Us
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August 28, 2025
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