Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Outlast
"I know I've said it before, but fuck this place."
— Miles Upshur
This game has a frighteningly large amount of things to be scared of. Whether it's due to seeing piles of intestines and gore, or running away from the crazed inmates, there's something here to scare everyone.
This game's graphics provide plenty to be afraid of. The detail put into the blood and gore is good. Unfortunately, it's a little too good at points, to where just standing around and looking is sure to make you queasy.
Early on in the game, you are met with the lovely sight of a necrophiliac inmate having his way with a beheaded body in the form of an effective Jump Scare. And, when he sees you, he calls you the sicko. Rest assured, this scene has left quite the impact on a number of players.
The huge inmate, Chris Walker, is enough to make any player scared to look around the corner. The first time we see him, he calls Miles a "little pig" and throws him through a window. Getting caught by him later will likely result in Miles's head getting literally ripped off from his shoulders. It makes the Walrider'seffortless killing of him all the more scary.
Those Two Bad Guys, who stand naked in front of Miles, calmly talk about how they'd love to kill him slowly and take various parts of him. This doesn't become that big of a deal until you have to escape from both of them.
It becomes worse with a dash of Fridge Horror: it's implied◊ that after the fingers he was going to go for the groin and tongue next, had Miles not escaped.
Being discovered by the enemies makes things really fast and intense as it becomes a game of cat and mouse. It's scary because you have no idea where you are going, where's safe to hide, and where the items are.
A mix of this and Tear Jerker. The, surprisingly comprehensible, inmate you find in the burning room late in the game. He just sounds so defeated as everything around him has gone to hell. Him attacking you a little later in the game implied that he was about to lose his sanity.
Chris Walker's death. The player should feel relieved that he's off their back, but just watching how the Walrider kills him is just as disturbing as the others. First, Walker is thrown around like a rag doll but then he's pulled into the air vent and diced up by the fan. And the worst part: that could have happened to Miles! In a disturbing way, this was a Villainous Rescue.
One of the rooms in the sewers is a massive underground reservoir, so large it renders the camera's IR pretty much useless. Far on the other side, you see a little speck of light. The sheer size of the reservoir is foreboding in itself, but it's not long before you hear the clinking of Chris Walker's chains. And the echos in the room make it nearly impossible to find out which direction the sound's coming from, forcing you to walk through chest-deep water towards the light and pray that he doesn't find you. Walker only appears once you jump to the exit ladder, making the buildup that much worse.
In one room, you find a guy in a straight jacket, gagged and blinded. He follows you. Slowly, not saying or doing anything, but no matter where you go in the room, he just FOLLOWS you. It is really unnerving.