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.
ok game really.
it is enjoyable but not that kind of game you would play constantly.
problem:
you kill women spy's at one point of the game(who will try to kill you).
it is way to short.