Return to the Black Mesa complex in this additional Half-Life storyline. In this module, you play Barney Calhoun, a security officer working Blue Shift who is present at Black Mesa at the same time as Gordon Freeman. Your goal is to try to get out of Black Mesa alive as all hell breaks loose and reality is altered around you.
This version can be played stand-alone and also includes the Half-Life High Definition Pack that replaces most of the Half-Life/Opposing Force/Blue Shift player and weapon models and textures with updated high-res models and textures.
Additionally included in the Blue Shift package (US version only) is the previous expansion is Half-Life: Opposing Force.