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Half-Life: Blue Shift
Half-Life: Blue Shift is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and published by Sierra Entertainment on June 12, 2001. Blue Shift is the second expansion for Half-Life, originally intended as part...
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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 Los Angeles, California, the company was last owned by Activision, a...
Valve Corporation
Valve Corporation is an American video game development and digital distribution company based in Bellevue, Washington, USA that was founded in 1996, and made famous by its first product, Half-Life, which was released in November 1998.
Valve was...
