Three creepy PC classics for October

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For October & Halloween, there's lots of ways you can celebrate the month and enjoy the holiday: eating candy, dressing up, and watching horror films.
If you'd like to try something a little different this year, here's three fine PC classics you can buy today that work on any system (Descriptions/links to GoG, all also available on Steam):
Sanitarium
Imagine a world created out of insanity – deformed children, ancient gods, ghosts from your past in the house inside of a water reflection. You are an asylum patient and you have just survived a car crash – the problem is you can't remember anything. Visions reveal answers to some questions, but create even more riddles! Which part of it is true? What do all these things mean?

This is a beautiful, creepy adventure game.

System Shock 2:
The starship Von Braun took a giant leap for mankind as it made its first interstellar journey. The mission was going as planned until a lone distress call from the Tau Ceti V sector was picked up. An away team was sent on a rescue mission, but once it arrived at its destination, there was no sign of any humans and the source of the signal remained unclear. They didn't realize something crucial, though: they brought something back with them when they returned. Now, you--a member of the ship's security team--awake from cryostasis to the sounds of screams of pain and horror as everything falls apart. The state-of-the-art spaceship becomes a deathtrap, and the only hope you have is the contemptuous whisper of a voice guiding you through the dark corridors, leading you towards the ominous secrets that lurk in the shadows.

If you've played this, you'll have no doubt why it's on here, even though this is not a horror or adventure game. If you play this game in the dark with headphones on, it's an experience you won't soon forget. If you liked BioShock or Deus Ex, you'll want to try this one and the original- the genre started here!

I Have No Mouth and I Must Scream:
The last people on Earth are buried deep within the center of the earth, trapped in the bowels of an insane computer for the past hundred and nine years. Gorrister the suicidal loner. Benny the mutilated brute. Ellen the hysterical phobic. Nimdok the secretive sadist. Ted the cynical paranoid. It's time for them to play a little game...

This is based on the short story of the same name by Harlan Ellison, who voices A.M., and worked on this version.
This is a creepy and downright disturbing adventure game that covers very adult themes.