Winter!: Prepare for holiday gaming!
This is a very difficult game, well designed and almost realistic. I mean take two hits of a gun and you'll certainly be dead. The setting is so good it pulls you into the game almost immediately. Walking around into terrifying places, I recall looking into a cave and thinking "No way I'm going in there".
Game Traits applied to S.T.A.L.K.E.R.: Clear Sky by Autonomous