Sierra Entertainment

Sierra Entertainment is a american publisher and developer founded in 1979.

This company is responsible for games like Half-Life 2, Half-Life, TimeShift, Half-Life: Opposing Force, Aliens Versus Predator 2, F.E.A.R.: First Encounter Assault Recon, No One Lives Forever 2: A Spy in H.A.R.M.'s Way e Counter-Strike.