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.
It's a half life game and it was funny in the beginning. It was very short but still a great game.It will be one of my personal favorites.Every bit of Blue Shift is worthy of the Half-Life legacy. The game is good and well made, but rushed and without any real new content. You should play this before Opposing Force because if you play it after you will be disappointed expecting this to at least be on the level of content of Opposing Force. If you liked Half-Life, this is still a must play.