While The Evil Within is a relatively underrated horror game in general, most people seem to agree that Ruvik’s Mansion is both the most interesting and one of the scariest parts of an intensely scary game.
The whole situation you find yourself in only gets scarier the higher the difficulty you’re playing on. It’s the atmosphere here that really kicks this stage to a whole new level because if you play in the dark, all alone, you’re going to be checking over your shoulder pretty often.