S.T.A.L.K.E.R. Clear Sky – GCS Game World's prequel to their long-in-development and well-received "survival FPS" S.T.A.L.K.E.R. – will be available for digital distribution exclusively on Steam, where the original game is available for a reasonable $20. If you're not into getting your games virtually, it will still be available in stores on the very same day "later this year." Now the question is whether or not "later this year" falls within the estimated Q1 release; considering the original's six year development cycle and their other ongoing projects, we're not placing any bets.