S.T.A.L.K.E.R.: Shadow of Chernobyl is now available on Steam.

Offering a unique combination of First-Person Shooter (FPS) and Survival-Horror action, S.T.A.L.K.E.R.: Shadow of Chernobyl gives gamers unprecedented freedom to explore the devastated exclusion zone that surrounds the Chernobyl power plant following a second apocalyptic explosion.
Source S.T.A.L.K.E.R.: Shadow of Chernobyl is now available on Steam.

Offering a unique combination of First-Person Shooter (FPS) and Survival-Horror action, S.T.A.L.K.E.R.: Shadow of Chernobyl gives gamers unprecedented freedom to explore the devastated exclusion zone that surrounds the Chernobyl power plant following a second apocalyptic explosion.
Source