I will admit I have never played any of the Amnesia series of games as even their trailers creep me out. So that is my suggestion - a series of games too scary to even play.

Subnautica. Not really a horror game, but terrifying none the less.

My favorite horror games are Friday the 13th on the NES and Silent Hill 2 on the ps2.

The Evil Within 1. I really love the amosphere and the boss fights. The boss fights almost creaps me out every time.

searching for heads in Phantasmagoria. Good times

Alone in the Dark: the New Nightmare, it was a really cool step up in the franchise, it mixed Lovecraftian horror with Resident Evil and other previous seen stuff of the Alone in the Dark franchise, really wish someone would make a new one with a similar style, or even a remake for the first Alone in the Dark, it could be the ultimate Lovecraftian survival horror.
And after mentioning it, I also recommend the first Alone in the Dark, it really shows its age, but its really interesting to see how survival horror started.

A halloween game that isn't necessarily scary but has every element of gothic horror in its art direction is CASTLEVANIA LORDS OF SHADOW. The game is hack-and-slash, but has ample puzzle soleving sections to make your forehead all beady with sweat. You (slight SPOILERS) fight werewolves, vampires, ghouls, all the while dressed up as a noble warrior destined to bring back the light to a decadent world. The level aesthetic harkens to what you would expect form a gothic horror game - dilapidated fortresses, abandoned villages, restless crypts and what not! Despite deviating from the traditional metroidvania formula, it holds its own as a worthy reimagining of a legendary franchise.

I highly recommend this to everyone, but especially those (like me) who are a little squeamish when it comes to scary games but don't want to miss out on some halloween fun.

Real life.

I would recommend Magic Online, the online version of the Magic: The Gathering fantasy trading card game. I’ll use some poetic licence in describing the game:

Although not typically a horror game, players of Magic can imagine themselves as practitioners of black magic on the night of All Hallows’ Eve. By consulting a spellbook, the mage can summon a vengeful witch, or conjure a sorcery that raises the dead. As necromancy and dark rituals are performed, the battlefield quickly becomes overrun with zombies, vampires and other creatures of the night, as depicted in trading cards of Magic:

1. All Hallow's Eve {2}{B}{B}
Sorcery
Exile All Hallow’s Eve with two scream counters on it.
At the beginning of your upkeep, if All Hallow’s Eve is exiled with a scream counter on it, remove a scream counter from it. If there are no more scream counters on it, put it into your graveyard and each player returns all creature cards from their graveyard to the battlefield.

2. Dawn of the Dead {2}{B}{B}{B}
Enchantment
At the beginning of your upkeep, you lose 1 life.
At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield. That creature gains haste until end of turn. Exile it at the beginning of the next end step.

3. Army of the Damned {5}{B}{B}{B}
Sorcery
Create thirteen tapped 2/2 black Zombie creature tokens.
Flashback {7}{B}{B}{B}
Sometimes death comes knocking. Sometimes it tears down the walls.

4. Endless Ranks of the Dead {2}{B}{B}
Enchantment
At the beginning of your upkeep, create X 2/2 black Zombie creature tokens, where X is half the number of Zombies you control, rounded down.

5. Zombie Apocalypse {3}{B}{B}{B}
Sorcery
Return all Zombie creature cards from your graveyard to the battlefield tapped, then destroy all Humans.

6. Headless Horseman {2}{B}
Creature — Zombie Knight
2/2

7. Black Cat {1}{B}
Creature — Zombie Cat
When Black Cat dies, target opponent discards a card at random.
Its last life is spent tormenting your dreams.
1/1

8. Reassembling Skeleton {1}{B}
Creature — Skeleton Warrior
{1}{B}: Return Reassembling Skeleton from your graveyard to the battlefield tapped.

9. Sengir Nosferatu {3}{B}{B}
Creature — Vampire
Flying
{1}{B}, Exile Sengir Nosferatu: Create a 1/2 black Bat creature token with flying. It has “{1}{B}, Sacrifice this creature: Return an exiled card named Sengir Nosferatu to the battlefield under its owner’s control.”
4/4

10. Treacherous Werewolf {2}{B}
Creature — Werewolf Minion
Threshold — As long as seven or more cards are in your graveyard, Treacherous Werewolf gets +2/+2 and has “When Treacherous Werewolf dies, you lose 4 life.”
2/2

11. Banshee {2}{B}{B}
Creature — Spirit
{X}, {T}: Banshee deals half X damage, rounded down, to any target, and half X damage, rounded up, to you.
0/1

12. Bitterheart Witch {4}{B}
Creature — Human Shaman
Deathtouch
When Bitterheart Witch dies, you may search your library for a Curse card, put it onto the battlefield attached to target player, then shuffle.
1/2

13. Triskaidekaphobia {3}{B}
Enchantment
At the beginning of your upkeep, choose one —
• Each player with exactly 13 life loses the game, then each player gains 1 life.
• Each player with exactly 13 life loses the game, then each player loses 1 life.

The Walking Dead Survival Instinct is really difficult and frustrating. Losing your progress is the scariest part.

I have two recommendations based on what one wants!

If you want an actual "jump out of your own skin" experience, Outlast is what you're looking for.

If, like me, you hate the powerlessness you feel in games like that, and want to be on your toes and your head on a constant swivel yet have a chance to do something to those scary bastards, Dead Space 1 is a fantastic choice.

I recommend everyone whom as of yet have not tried 7th Guest to give it try, if you like it, there is even a followup in 11th hour! :D

I absolutely must recommend SOMA, superb psychological horror game.

STASIS is also a masterpiece, although probably less tense than the former - still, I'd put them both on top, even score.

This is an easy one: Carrion! This gem deserves much, much more attention than it's gotten.

Imagine The Thing, where you play as the monster- an amorphous horror of mouths, teeth, and tentacles that can burst out of an air duct into a room full of food, er, I mean "people", and in a matter of seconds tear them to pieces, devour the remains, smash the room, rip the door off its hinges, and continue your reign of bloody terror! Oh, and you can evolve new abilities as you progress.

The pixel art graphics are fantastic without being stomach-churning, the story (such as it is) is engaging and slowly reveals itself through discoveries and flashbacks, and the whole thing is just plain *fun*! Clever puzzles, a unique game mechanic, and community-made levels. I think John Carpenter would be impressed.

Eternal Darkness: Sanity’s Requiem