Half-Life: Blue Shift – Wikipedia

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 with Valve Corporation and published by Sierra On-Line on June 12, 2001. Blue Shift is the second expansion for Half-Life, originally intended as part of a Dreamcast version of the original game. . Although the Dreamcast port was …

https://en.wikipedia.org/wiki/Half-Life:_Blue_Shift