PC:
Bioshock
Call Of Cthulu: Dark Corners Of The Earth
Condemned
Dead Space
Half-Life 2 series (I've played through most of the first HL2 game, but I need to get it back)
I Have No Mouth, And I Must Scream
Oddworld: Munch's Oddysee
Portal 2
Spore/Spore Creature Creator
Playstation 1:
LSD
MediEvil
MediEvil II
Shadow Man
Playstation 2:
Silent Hill 2/3/4