This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Jurassic Park: The Game
From the first episode alone, the game starts off with a main character being chased by new dinosaurs, the Troodon in an In Medias Res prologue sequence and we, the players, are only able to see their glowing eyes getting ever closer. The raspy, ghostly, haunting sounds they make are even worse. As the episode switches to the chronological beginning of the story, two characters find themselves being stalked, and in one's case being eaten by a pack of Dilophosaurus, but not before being treated to glimpses of Nedry's corpse. To top it off, you find yourself having to deal with the Tyrannosaurus in the Visitor's Center and there is a moment where it is actually stomping up the stairs after you. Again, keep in mind, this is just the first episode.
In the case of Nedry, there's buildup. Seeing the vehicle with its lights still on, your companion calls up to him, but gets no response. As you approach the vehicle, you can hear the sounds of bones crunching and flesh being ripped before you ever open the door. Then when you do open the door, there's a shadowy shape next to the body before it suddenly runs out and scares the crap out of the main character. To top it off, you the player already know what happened here, leading to some uncomfortable Dramatic Irony as the characters slowly piece together the events and learn why Nedry never made it to the docks.
What brief glimpses we do see of Nedry's corpse aren't very graphic at all, thankfully. This concept art◊, on the other hand...
Many of the death scenes can be particularly unsettling, even the ones that use a Gory Discretion Shot. Especially those ones. For instance, one of the earliest ways to die involve being spat on by the Dilophosaurus. We are then treated to a first person view of one lunging at the player with jaws wide open.
Nima's eyes fogging up as the venom progresses, making her look like something unpleasant from the Uncanny Valley.
The wreckage of the abandoned Visitor's Centre. The most triumphant scene in the film suddenly seems a lot more sinister in hindsight.
Expect a lot of Jump Scares. One of them involves the Visitor Centre at the end of episode one.
In a game featuring vicious dinosaurs, it is somehow even more disturbing to find corpses of people who were shot to death. Even more so when Yoder notices that they didn't even take cover. Then you discover that they were killed by a soldier going insane with fear and venom, and while investigating the Visitor Centre the building is filled with the sounds of creatures rushing from shadow to shadow.
The minute the raptors turn up — in a designated safe haven, no less — you know you're screwed.
The utility tunnels. The player knows that the unarmed civilians are being followed by raptors using a parallel tunnel, but they don't know until one goes off for a quiet smoke and lights up...
The Troodon are so terrifying that most of the other predators flee from them, even the raptors. Yes, those raptors, the ones that terrify virtually everybody else.
The Troodon lay their eggs inside of their victims, while they're still alive. Did we mention that the victim is paralyzed all over while this happens, except for their eyes, which stare at you if you get too close? Gerry's reaction to discovering this fact is entirely appropriate.
"You knew about this!? You KNEW? I'll KILL YOU!"
Late in the game (after the puzzle with the blueprints), Billy hears some noises coming from a dark hallway and goes to check it out, suspecting Troodon. He doesn't see any glowing eyes, but still isn't sure. He slowly enters the hallway, creeps up to the darkness, and lights a flare... which reveals a whole pack of Troodon just inches from him.
Funnily enough, that action is what saves his life since they can't stand the bright light. Too bad he already mentioned earlier that he only has one pair of pants.
Somehow, the fact that the Troodons can't stand bright light makes them that much more terrifying. Even most nocturnal animals today can still cope with bright light sources. It makes the Troodons seem more like mythical creatures of the night such as vampires.
It doesn't help that because of their eyeshine the Troodon look like they have pure blank eyes, as if they really are undead creatures.
The Tylosaurus, which takes its tactics directly from Jaws. The ghastly, whale-like sounds it makes are creepy enough, but then you see its pure-black eyes, the permanent snarl on its jaws, the dark colouration of its scales, and how fast it can move despite its size.
The part during the final T. rex chase, where Gerry runs into a crate only to have the T. rex stick its head in, lift it off the ground, and start flinging it around.