Gaslighting in Video Games.
- Alfred Hitchcock - Vertigo: This trope is a huge plot point as basically everything that happened to Ed Miller was done by Veronica with the intent of driving him insane so she could get him interned in a psychiatric hospital. Meeting him one night, sleeping with him, then disappearing without trace only to come back a year later with a baby that is allegedly his. Then disguising as his deceased mother in the middle of the night and showing before him then drugging him so he loses consciousness and believes it was only a nightmare. And finally, faking a car crash, disappearing once again with the baby, then disguising herself as Ed's dead father and making him relive the latter's death. The trope is even referred to by name as the Sheriff does a briefing of the events.
- Dark Seed II, in a small but breathtakingly pathetic example. In Mike Dawson's bedroom is a closet that he never bothers to open because he knows it's locked. Eventually we discover in a flashback that when he was a child he was scared of monsters in the closet. To humour him, his mother pretended to lock the door. Decades later he finally realises that it was never locked at all.
- In Chapter 2 of Deltarune, Kris (or rather, the player through Kris' body) does this to Noelle on the hidden Weird Route. They manipulate Noelle by playing into her Nice Girl and Extreme Doormat attitude, make her entirely dependent on them, and prey on her fears to make her obedient. As a result, Noelle becomes a mindless puppet who kills on command, even when she knows it's wrong.
- Fallout: New Vegas features a Vault where this was the entire experiment, with the vault segregated into two sections and discord and paranoia sown between the two groups (not helped by the colony of lizards that moved into the sulphur caverns underneath the vault who made scratching noises in the ventilation). The medical terminal notes that an awful lot of residents are developing paranoia and other mental illnesses. By the time you find the powder gangers residing here they've begun to undergo the same process, albeit the lizards are now fire breathing geckos.
- In one of the hidden storylines of Lonely Wolf Treat, Treat is forced to join forces with a suspicious wolf named Timber. Late in the story, the rabbit Juju attacks Treat and threatens to push her off a cliff, when suddenly Timber comes out of the shadows, Treat blinks... and Juju herself ends up dead at the bottom of the cliff. Timber then tries to convince Treat that she is the one who pushed Juju to her death, knowing she was in too much of a panic to confirm or deny it. When Treat accuses Timber of having murdered other rabbits, Timber simply doubles down and insists that Treat herself is no better. And that's where the story ends.
- In Metal Gear Ac!d, Alice (almost) manages to give Snake an entire Jekyll & Hyde split personality by secretly dosing him with hallucinogens through the remote-controlled drug injector in his suit (to put him in a compromised psychological state), setting up clues on the base itself (such as hacking the security system so it appears to know Snake's retinal patterns), having people Snake has never met pretend to know him as the other person, and having a character dress as Snake and claim to be his Doppelgänger to give him an Enemy Without encounter, amongst other things.
- The Endermen in Minecraft invoke this, as they actively pick up and move blocks around for no reason.
- In Persona 5, Futaba was gaslit into believing that her mother Wakaba hated her and that she committed suicide because of her. The truth is that Wakaba was murdered by The Conspiracy, and The Men in Black forged a suicide note saying that she wished Futaba was never born, which they read out loud in front of Futaba in order to convince her that her mother hated her. This caused Futaba to develop severe PTSD while worsening her social anxiety to the point where she turned into a Hikikomori. However, her Shadow Archetype points out to her that Wakaba was always a loving mother who never acted abusive, causing her to realize that the image of the abusive Wakaba who hated her was a false memory created through this psychological manipulation, allowing her to figure out the truth and awaken her own Persona.
- One of the weirder things about Phantasmagoria: A Puzzle of Flesh is that there's definitely gaslighting going on — by a supernatural being. (Short version: some evil creature from another dimension is trying to break Curtis's mind to take over his body.)
- Dutch in Red Dead Redemption II does this very frequently to his gang members. He does this to Arthur, John, and Javier in ambient conversations, enforcing a black and white mentality, of "doubt or faith" and becomes sharp and aggressive when they don't immediately agree with sufficient enthusiasm. Most telling is when he abandons Arthur to die at the military base and Arthur calls him out on it, Dutch vehemently denies he did such a thing.
- Sleeping Dogs (2012): In one mission, Wei and an ally scheme to make a deeply superstitious Triad boss relapse on his heroin addiction by breaking into his mansion and ruining his careful feng shui, rearranging his furniture, stealing his Good Luck Charm and sprinkling some references to the number four around to scare him into thinking he's being haunted by vengeful spirits. After they're done, Wei's ally remarks that the boss might not believe the "ghost" story they've cooked up, but figures that knowing people are breaking into his house to mess with him will also have the desired effect on his psyche.
- Super Mario Bros.:
- Part of a Secret Test of Character in Mario & Luigi: Partners in Time. The Star Gate gaslights Luigi by giving him three options to answer a question, calling them all wrong, declaring the answer an unavailable fourth option, and accusing Luigi of lying when he points out that said fourth option did not exist for him to pick. The test was to see if Mario would defend his brother.
- Paper Mario: The Thousand-Year Door: Beldam gaslights Vivian twice. Both times deal with Beldam losing something that she specifically stated she didn't trust Vivian with, then claiming she said no such thing and blaming Vivian for losing them, followed by threatening to punish her.
