Doom 3
I know some folks dislike Doom 3 for valid reasons. But as its own thing, and not a sequel to Doom 2, (which it is, but in name only…) I think first-person shooter Doom 3 is fantastic! Its use of shadows and darkness is excellent, hiding demons and other threats behind the darkness. Doom 3 also has some disturbing (in a good way!) sound design. And if you want to really get scared playing Doom 3, I highly recommend playing the VR port of the game released on PSVR earlier this year.
