STALKER: Clear Sky game is a prequel to S.T.A.L.K.E.R.: Shadow of Chernobyl, that was released by Ukrainian developer - GSC Game World studio. S.T.A.L.K.E.R.: Clear Sky game is first-person shooter with open-world and role-plying game's elements. The half of the locations here was redesigned, and the half was added in comparison to the first game.