S.T.A.L.K.E.R.: Shadow of Chernobyl

First-person shooter set in Chernobyl exclusion zone in a fictional future. Strange anomalies and artifacts show up in the area and you go into the zone to find valuable artifacts to sell and also to find Strelok, someone that your PDA tells you to kill. Real nice atmosphere in this game and also epic bugs that destroy the game. Like that the game keeps running and kills you when looking at cutscenes or that the enemy that just killed you know where you are even when you have loaded a game where you did not even meet him yet.