Why has nobody said S.T.A.L.K.E.R.: Shadow of Cherynobyl?! With the Oblivion Lost mod, it was by far the scariest thing I had ever played.
I agree with this statement.. Some parts when you are on the building and the fast zombies were crawling up the pipes and you heard a clinking noise.. but didn't know what it was.. and BAM.. scare the shit out of me sometimes.