S.T.A.L.K.E.R.: Clear Sky is a Open World, Atmospheric, Post-apocalyptic PC game, developed by , available on Steam and published by .
S.T.A.L.K.E.R.: Clear Sky – standalone prequel for the acclaimed S.T.A.L.K.E.R.: Shadow of Chernobyl, which tells you story about the Clear Sky group, that want to research the Zone and understand it better.