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Nightmare House is a small pack of Singleplayer levels. It's focused, as you've probably guessed by now (by its name), on scaring the holy ... out of you. And it did that pretty well, IMO. DooM 3 is a walk in the park compared to this. At first, it may not seem scary at all, bu the further you go... The more tense it gets.
I highly recommend to all of you who haven't tried this out. Those who have, please, keep it spoiler free, however feel free to discuss it.