I recommend Clive Barker's Undying, that's a pretty funky game, with a lot of locked, stuck, and jammed doors :D

A dark room. A buzzing CRT monitor. An 8-bit PC’s tape loader screams as it finishes loading an old parser-based horror text adventure. I’m in a car in front of a house. I begin typing commands. I find a key in the glovebox. I unlock the front door. I step into the house. As I explore, strange things start to happen in the room I'm sitting in, eerily mirroring the game. It’s a wonderfully creepy idea, which Stories Untold cleverly riffs on across four episodes: seemingly standalone, with huge differences in gameplay between them, but you begin noticing the connections as they begin to reference each other in increasingly clever ways... It's a brilliantly subversive experiment in storytelling that delights in messing with your head, telling an intriguing, enigmatic sci-fi horror tale in a genuinely unique way, and ending with a dramatic final act that will leave you gasping.

Just check and can't believe no one has recommended this game yet. I mean when it comes to horror, this game will make your skin feel uneasy on your body, I'm serious haha. Wann know what is the game I am talking about?......BA DUM TAS!!!!! It's 'DARKWOOD'! This game might look like it's a silly super linear top down survival game but oh boi I'm glad it's not. Don't get fooled by its first appearance, it's a maniac game if u wanna experience a super scary environment with totally fair gameplay and procedurally generated map. I mean who doesn't love a replayable game? Well no more looking for a horror game, if u want a game to play for around 40-70 hours, look no further this is it. I swear I'm not their PR representative haha I'm just a lover of super polished indie games. Thanks a lot for doing this amazing giveaway GOG! LOVE YOU GUYS NO MATTER WHAT!!! *VIRTUAL FLYING KISSES*

Just because I don't miss a chance to recommend this game ;-)
The Cat Lady is a clear must play.

Pretty obscure and pretty light in terms of scariness but this will definitely surprise you guys, it's Toree 3d available on Nintendo Switch and PC

SOMA is the best.

There's no jump scare.
The atmosphere, the story and the character mixed together create an excellent experience!

Definately Song of Horror is your best game for a Halloween night.

Some of my favorites have already been mentioned: Dead Space, Outlast, Silent Hill 2.

So I'm gonna give a shoutout to Resident Evil 7, both for taking the series down an interesting path and for being an all-around fine game.

When it comes to GOG's catalog, a great game for Halloween is Little Nightmares. Genuinely creepy and occasionally unsettling, but with a certain sense of playfulness thrown into the mix. Its DLC is good but not what I'd call essential.

Silent Hill 2, which really should be released here, along with 3.

Game:
Cataclysm Dark Days Ahead

Free game. Zombies with Hardcore survival.
With every iteration comes new and amazing prospects. The characters the user creates, can be whatever background and roll as one would expect in real life. Play as any walk of life. Add buffs and debuffs to your character. Survive as long as you can! Each time your character dies, it is forever. But for you. The player, you learn to be more resourceful in order to keep your character alive longer.

Build a vehicle. Defend yourself against extra planar monsters and eat SPAM!!
(Apocalyptic food item for the ages!!)

While primitive looking on the surface. The game garners horror by creating random generation of everything in the game and letting you get into some really tense moments. Just think of playing for 70 real days and getting into the games depths. Only to have made a mistake that gets your character permanently killed! Don't be angry. Be more aware of your characters surroundings and get better at playing the next round. You can do it!

Fun and difficult. The stable version has a good base to start with. But the experimental latest variants come packed with all the latest graphics and gameplay features. So if you do not mind bug testing. I would suggest the latest experimental.

Hope you all enjoy it!

Blair Witch would be a perfect Halloween play!!

Alien Vs Predator 2000, as the marine... I remember playing it way back around that same year, on my trusty Cyrix M2-333, 32MB Ram with a cheap generic 8 Meg 2D graphic card. Boy!, did that game send shivers down my spine... Yep!, it sure did. The dark and dingy corridors, moody ambient noises, and the constant realisation that there are nasty things out there, somewhere, watching, and waiting to ripe your face off. Not if, but when... And this was someone that less than six months earlier, was doing most of their gaming on their trusty Amiga 1200. I need to revisit that game again sometime, as I have never actually managed to complete it since playing it back then.

I am torn between two titles. I really love "Dead Space" atmosphere, the unraveling story from the disturbingly crude events in the USG Ishimura, the very creative dismemberment combat system and of course, the main character Isaac Clarke. Being an engineer forced to survive just using repurposed tools as weapons separates Isaak from the typical hero in most survival-horror games, he is not a soldier, he's not been trained in combat and all his weapons are improvised. A great story mixed with stunning visuals that create a really unsettling game. However, my recommendation for the contest has to be "Alien Isolation". Most of the things that make Dead Space great, also apply to Alien Isolation, but there is a factor that in my opinion makes it a little better: the fact that you can't fight back horror. You can hide yourself, you can escape, you can even try to fight back, but true horror is indestructible, invencible and restless. It hides in the darkness, it will track you, it will find you and it will kill you eventually. And that's the xenomorph, the perfect hunting/killing machine, waiting for your slightest mistake to devour you. Beautiful visuals, very true to the original movie makes this one of the most outstanding games in the genre.

I recommend Condemned: Criminal Origins.

BLAIR WITCH: VOLUME I - RUSTIN PARR

(Released in the year 2000)

Sure, the Blair Witch trilogy of games was not perfect. Technologically they were a little dated - the Nocturne engine powering them wasn't exactly cutting edge when the third part hit the shelves, the fixed camera approach just started to go out of fashion, but man was Volume 1 - Rustin Parr terrifying.

It was those little moments that made me completely stupefied by fear. The more dynamic moments were OK, but... I remember a specific puzzle. You turn on the voice recorder when you meet a boy talking to his imaginary friend. Later you can listen to the recorded "conversation" and soon enough you start playing with dials on the device. Gradually, setting after setting, you are starting to hear something in the background. The sound of the static and deformed voices is enough to create an incredible atmosphere - a heavy, surreal, feeling of dealing with the unknown and the otherworldly. And when you finally find the perfect setting...

Definitely one of the best horror games I've ever played.