S.T.A.L.K.E.R. prequel to be a Steam digital exclusive

Valve has announced that S.T.A.L.K.E.R.: Clear Sky, the prequel to GCS Game World's shooter, will be released later this year as a Steam digital exclusive, simultaneous with its retail release.

"It's great to see a forward-thinking game maker like GCS Game World launching simultaneously in digital and traditional retail channels," said Valve co-founder Gabe Newell.

"By launching S.T.A.L.K.E.R.: Clear Sky on Steam on the same day that it's available in stores worldwide, GCS Game World ensures that gamers can get their hands on this highly-anticipated game in the way that's most convenient for them."

GCS Game World has indicated that Clear Sky will take place one year prior to the events of the original S.T.A.L.K.E.R., featuring a new version of the game engine as well as a new weapon and armor upgrade system and other improvements.