S.T.A.L.K.E.R.: Clear Sky is a 2008 first-person shooter survival horror video game with role-playing elements. It was developed by GSC Game World and published by Deep Silver as a prequel to S.T.A.L.K.E.R.: Shadow of Chernobyl. From Wikipedia
GSC Game World remasters the original STALKER games with advanced graphics, mod support, and cross-platform availability for PC, PS5, and Xbox Series X/S.
