Half-Life: Resistance is the reason for which the Half-Life 2: Episode 3 has never arrived (and at this point we do not know if it ever comes). He said in a recent interview with Dario Casali historical level designer at Valve.

The output of Half-Life: Gun has finally forced Valve to come out of his shell. The new adventure set in the world of Half-Life, in addition to being a success on all fronts (at least judging by the votes), is also allowing Valve to talk about one of the greatest mysteries of our industry, which is what happened to…