Half-Life: Blue Shift

Released on June 1, 2001 by Valve

Developed by Gearbox Software

Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research Facility in which you play as Barney Calhoun, the security guard sidekick who helped Gordon out of so many sticky situations.

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