Half-Life: Blue Shift is a standalone expansion pack for the acclaimed first-person shooter, Half-Life. Released on June 12, 2001, by Gearbox Software, this title allows players to experience the game's universe from a new perspective. Set in the same science fiction world, players take on the role of Barney Calhoun, a security guard at the Black Mesa Research Facility, navigating through the chaos following the resonance cascade incident. The gameplay features similar mechanics to the original Half-Life, with an emphasis on action and exploration.

The expansion introduces new environments, enemies, and challenges while maintaining the core elements that fans of the series appreciate. With its engaging storyline and immersive gameplay, Half-Life: Blue Shift enhances the overall narrative of the Half-Life series. It was later made available on Steam, allowing both new and returning players to enjoy this classic action-packed experience.