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* ''VideoGame/TheElderScrollsIIIMorrowind Morrowind'':
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* ''VideoGame/TheElderScrollsIIIMorrowind Morrowind'':''VideoGame/TheElderScrollsIIIMorrowind'':
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* ''VideoGame/TheElderScrollsIIIMorrowind Morrowind'':
** The Sleepers, otherwise normal people who've been influenced by [[BigBad Dagoth]] [[PhysicalGod Ur's]] [[PsychicDreamsForEveryone Psychic Dreams]] start out babbling about [[KingInTheMountain Dagoth's return]] and the rise of the [[ReligionOfEvil Sixth House]]. After a certain point in the main quest, they will turn hostile and start attacking the player.
** Dagoth Ur and the [[PhysicalGod Tribunal]] all suffer from sanity slippage to varying degrees as a side-effect of [[DeityOfHumanOrigin becoming Gods]] through the power of the [[CosmicKeystone Heart of Lorkhan]]. Dagoth Ur has it the worst, since he was far less restrained in his consumption of the heart's power. Of the Tribunal, only Almalexia exhibits any [[GoMadFromTheRevelation obvious signs of insanity]], though it is implied that Vivec and Sotha Sil would have eventually suffered the same fate.
** The Sleepers, otherwise normal people who've been influenced by [[BigBad Dagoth]] [[PhysicalGod Ur's]] [[PsychicDreamsForEveryone Psychic Dreams]] start out babbling about [[KingInTheMountain Dagoth's return]] and the rise of the [[ReligionOfEvil Sixth House]]. After a certain point in the main quest, they will turn hostile and start attacking the player.
** Dagoth Ur and the [[PhysicalGod Tribunal]] all suffer from sanity slippage to varying degrees as a side-effect of [[DeityOfHumanOrigin becoming Gods]] through the power of the [[CosmicKeystone Heart of Lorkhan]]. Dagoth Ur has it the worst, since he was far less restrained in his consumption of the heart's power. Of the Tribunal, only Almalexia exhibits any [[GoMadFromTheRevelation obvious signs of insanity]], though it is implied that Vivec and Sotha Sil would have eventually suffered the same fate.
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** While BigBad Handsome Jack started out ''evil'' ([[spoiler:trapping your daughter in a small room for her entire life is not the action of a decent man]]), in ''VideoGame/BorderlandsThePreSequel'' and the "Get to Know Jack" sidequest in ''VideoGame/{{Borderlands 2}}'', he's shown to have steadily degenerated from a reasonably controlled form of evil to the casually murderous, deeply self-obsessed version that gets pointed at the Vault Hunters in ''2''.
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* Salvatore Leon from ''VideoGame/GrandTheftAuto'' comes off as a friendly, if ruthless man in ''VideoGame/GrandTheftAuto3'', only to [[spoiler:try and have Claude killed because he suddenly becomes convinced Claude's a spy]]. ''Liberty City Stories'' shows that he had fits of extreme paranoia before this, one time nearly blowing [[TheLancer Tony's]] head off while accusing him of scheming behind his back. [[spoiler:''VideoGame/GrandTheftAutoSanAndreas'' reveals that this extreme paranoia was caused by CJ playing him (and pretty much every other faction that was involved) for a fool in the game's bank heist arc.]]
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* Salvatore Leon Leone from ''VideoGame/GrandTheftAuto'' comes off as a friendly, if ruthless man in ''VideoGame/GrandTheftAuto3'', ''VideoGame/GrandTheftAutoIII'', only to [[spoiler:try and have Claude killed because he suddenly becomes convinced Claude's a spy]]. ''Liberty City Stories'' shows that he had fits of extreme paranoia before this, one time nearly blowing [[TheLancer Tony's]] head off while accusing him of scheming behind his back. [[spoiler:''VideoGame/GrandTheftAutoSanAndreas'' reveals that this extreme paranoia was caused by CJ playing him (and pretty much every other faction that was involved) for a fool in the game's bank heist arc.]]
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* Over the course of the Batman: Arkham games, the Riddler gets hit with this pretty hard. With every game he tries harder to defeat you, and with every game he fails, cracking his fragile ego further and further until, by Arkham Knight, he's more ranting and aggressive than ever before.
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* ''VideoGame/BatmanArkhamSeries'':
** Over the course of the Batman: Arkham games, the Riddler gets hit with this pretty hard. With every game he tries harder to defeat you, and with every game he fails, cracking his fragile ego further and further until, by Arkham Knight, he's more ranting and aggressive than everbefore.before.
** In ''VideoGame/BatmanArkhamAsylum'', Scarecrow is insane, but not much moreso than any other of Batman's rogues. After getting mauled and nearly killed by Killer Croc, he completely loses it and in ''VideoGame/BatmanArkhamKnight'' becomes arguably the biggest threat that Batman faces in the entire series.
** Over the course of the Batman: Arkham games, the Riddler gets hit with this pretty hard. With every game he tries harder to defeat you, and with every game he fails, cracking his fragile ego further and further until, by Arkham Knight, he's more ranting and aggressive than ever
** In ''VideoGame/BatmanArkhamAsylum'', Scarecrow is insane, but not much moreso than any other of Batman's rogues. After getting mauled and nearly killed by Killer Croc, he completely loses it and in ''VideoGame/BatmanArkhamKnight'' becomes arguably the biggest threat that Batman faces in the entire series.
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* Over the course of the Batman: Arkham games, the Riddler gets hit with this pretty hard. With every game he tries harder to defeat you, and with every game he fails, cracking his fragile ego further and further until, by Arkham Knight, he's more ranting and aggressive than ever before.
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** One of the nice things about this game is that you invert the process for a few characters. By helping them confront deep-buried issues and work through problems they get some of their lives back.
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* The tooltip for the debuff caused by the Dark Knight's Scourge in ''VideoGame/FinalFantasyXIV'' is "Sanity is slipping, causing DamageOverTime."
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** Tiny Tina, world's deadliest 13 year old. The reason behind her total loss of sanity? [[spoiler:Flesh Stick (I'm not kidding, that's the guy's name), sold her and her parents to Handsome Jack, for his Slag experimentation. Her mother gave her a grenade and taught her how to use. What next? Handsome Jack used them as guinea pigs. Seeing her parents mutate due to slag, Tiny Tina ran away after putting the grenade to a good use.]] Ever since, she went a bit nuts... BURN ALL THE BABIES!!!!
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** Tiny Tina, world's deadliest 13 year old. The reason behind her total loss of sanity? [[spoiler:Flesh Stick (I'm not kidding, (yes, that's the guy's is his name), sold her and her parents to Handsome Jack, for his Slag experimentation. Her mother gave her a grenade and taught her how to use. What next? Handsome Jack used them as guinea pigs. Seeing her parents mutate due to slag, Tiny Tina ran away after putting the grenade to a good use.]] Ever since, she went a bit nuts... BURN ALL THE BABIES!!!!BABIES!!!! DummiedOut audio files show Tiny Tina's descent into madness, but it was likely cut out for being a bit too disturbing since she's a pre teenager.
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* The Harran virus in ''VideoGame/DyingLight'' first causes seizures, then increasingly vivid hallucinations that rapidly take on a terrifying tone if the uninfected are unable to get their supply of Antizin on time. If it's allowed to progress past that, zombification is the inevitable (and irreversible) result.
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Adding in that Revan goes even crazier in SWTOR expansion
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** After the [[MookMaker Foundry]] is seized by an imperial strike team and Revan pulls a [[VillainExitStageLeft villain exit stage left]]. He returns in Shadow of Revan [[OffscreenVillainDarkMatter (pulling an army out of his ass in the process)]] after deciding "Screw it; lets kill everyone" promptly declares war on both the Empire (reasonable) and the Republic (less so). It's not like he was trying to save the galaxy before... oh wait.
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* Double subverted with Zant from ''VideoGame/TheLegendOfZeldaTwilightPrincess'' is normally calm and collected, but this is merely a facade, as he's actually completely nuts. During his boss battle, he reveals his true colors, but becomes even ''more'' insane as the battle goes on, until he goes apeshit and is reduced to a screaming, maniacal wreck.
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* All over ''Franchise/DeadSpace''. Alongside the [[ZombieApocalypse Necromorphs]], [[ArtifactOfDoom The Markers]] cause [[MindRape hallucinations, homicidal and suicidal ideation, paranoia, and a whole host of other pleasant symptoms]]. Most characters in the series are affect at least to some degree. [[spoiler: Including protagonist Isaac Clarke, whose deteriorating mental state was TheReveal in the original game and a major plot element in ''2'', where he had to find a way to stop his insanity before it made him kill himself.]]
* In ''VideoGame/BioShock'' anyone who is hooked on ADAM will slowly loses their sanity, as it destroys and rebuilds their physical and mental state. The best example is Dr. Steinman, in his audio diaries he becomes increasingly delusional, beleving he's talking to the Greek goddess Aphrodite, and spends most of his time doing surgery on other splicers to create his version of what is beautiful.
* In ''VideoGame/BioShock'' anyone who is hooked on ADAM will slowly loses their sanity, as it destroys and rebuilds their physical and mental state. The best example is Dr. Steinman, in his audio diaries he becomes increasingly delusional, beleving he's talking to the Greek goddess Aphrodite, and spends most of his time doing surgery on other splicers to create his version of what is beautiful.
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* All over ''Franchise/DeadSpace''. Alongside the [[ZombieApocalypse Necromorphs]], [[ArtifactOfDoom The Markers]] cause [[MindRape hallucinations, homicidal and suicidal ideation, paranoia, and a whole host of other pleasant symptoms]]. Most characters in the series are affect at least to some degree. [[spoiler: Including protagonist Isaac Clarke, whose deteriorating mental state was TheReveal in the original game and a major plot element in ''2'', ''VideoGame/DeadSpace2'', where he had to find a way to stop his insanity before it made him kill himself.]]
* In''VideoGame/BioShock'' ''VideoGame/BioShock1'' anyone who is hooked on ADAM will slowly loses their sanity, as it destroys and rebuilds their physical and mental state. The best example is Dr. Steinman, in his audio diaries he becomes increasingly delusional, beleving he's talking to the Greek goddess Aphrodite, and spends most of his time doing surgery on other splicers to create his version of what is beautiful.
* In
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* ''VideoGame/CliveBarkersUndying'': Journal entries show that this was inevitable for the Covenant siblings.
** ''"Can you hear the whispers, Jeremiah?"''
** ''"Can you hear the whispers, Jeremiah?"''
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* The protagonist of ''VideoGame/TheConsumingShadow'' is already doubting from the beginning of the game if anything he experiences is real. It only gets worse from there as he sets out to fight {{Eldritch Abomination}}s and other horrors.
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** Tannis explains in the sequel how she became a bit nutty and how the bandits came to be on Pandora. Her and several people used to work for the Dahl corporation and they were sent to Pandora to mine for minerals and do research studies. After a while, the corporation ditched everyone and left them to fend for themselves, causing many people who were normal and had decent lives to slowly grow insane and become bandits. While Tannis simply became just plain weird, she admits that what Dahl did left her and many others broken.
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** Tannis explains in the sequel how she became a bit nutty and how the bandits came to be on Pandora. Her and several people used to work for the Dahl corporation and they were sent to Pandora to mine for minerals and do research studies. After a while, the corporation [[ScrewThisImOuttaHere ditched everyone and left them to fend for themselves, themselves]], causing many people who were normal and had decent lives to slowly grow insane and become bandits. While Tannis simply became just plain weird, she admits that what Dahl did left her and many others broken.
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* Sigma suffers from this at the end of ''MegaManX6''. When Gate rebuilt him, he hadn't fully recovered from his defeat at the end of the previous game, and ends up as an unstable zombie who can barely even speak coherently (though he can still fight and [[HijackedByGanon hijack the plot as always]].)
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* Sigma suffers from this at the end of ''MegaManX6''. When Gate rebuilt him, he hadn't fully recovered from his defeat at the end of the previous game, and thus was an unstable mess would could barely speak coherently (though he could still fight and [[HijackedByGanon hijack the plot as always]].)
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* Sigma suffers from this at the end of ''MegaManX6''. When Gate rebuilt him, he hadn't fully recovered from his defeat at the end of the previous game, and thus was ends up as an unstable mess would could zombie who can barely even speak coherently (though he could can still fight and [[HijackedByGanon hijack the plot as always]].)
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* Sigma suffers from this at the end of ''MegaManX6''. When Gate rebuilt him, he hadn't fully recovered from his defeat at the end of the previous game, and thus was an unstable mess would could barely speak coherently (though he could still fight and [[HijackedByGanon hijack the plot as always]].)
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* [[spoiler: Fred]] is a particularly striking case, starting out as an asylum staff member and becoming one of the very patients they treat.
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* [[spoiler: Fred]] is a particularly striking case, starting out as an asylum staff member and becoming one of the very patients they treat.
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Moving to Visual Novels
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* Sakura in ''VisualNovel/FateStayNight''. It's like everything anyone ever says to her is another stab at her self confidence. And then Shinji tries [[spoiler:to rape her one more time, and then he'll tell Shirou about it]]. Yeahhhh things kind of go downhill from there. [[spoiler:Oh, and she was already eating people in her sleep, passing out frequently and also quietly going crazy anyway.]]
** [[spoiler:She does get better, however]].
** [[spoiler:She does get better, however]].
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* ''VisualNovel/NineHoursNinePersonsNineDoors'' has [[spoiler: Clover, waking up and being forced into playing the Nonary Game. For a second time. She is fine over this. What gives her a dive in the deep end, is Snake's death. Apparent in the "[[MultipleEndings Axe]]" ending.]]
** [[spoiler: The [[WordOfGod author has suggested]] that something traumatic changed Akane in the previous Nonary Game, leaving her cold, vengeful and capable of eliminating everyone who gets in her way.]]
** [[spoiler: The [[WordOfGod author has suggested]] that something traumatic changed Akane in the previous Nonary Game, leaving her cold, vengeful and capable of eliminating everyone who gets in her way.]]
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temporarily removing as per trope repair shop discussion
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* The ''VideoGame/ShadowHearts'' games, along with the usual HP and MP gauges, also feature a Sanity Gauge, as the characters are constantly fighting horrific and twisted abominations. If the Sanity of any character slips below zero, the [[HellIsThatNoise background music changes]] and the character goes berserk, attacking everything around them.
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* The ''VideoGame/ShadowHearts'' games, along with the usual HP and MP gauges, also feature a Sanity Gauge, as the characters are constantly fighting horrific and twisted abominations. If the Sanity of any character slips below zero, the [[HellIsThatNoise background music changes]] changes and the character goes berserk, attacking everything around them.
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* All three of the main characters in ''VideoGame/{{Ib}}'' can experience this. While Ib is on the outside the calmest of the trio, she doesn't really handle the gallery well. [[spoiler:She hallucinates constantly, seeing bunnies when she looks at dolls, seeing images of herself hanged, etc.]] Mary displays a bit of neediness from the get-go. It turns out [[spoiler:she is already unhinged, and can become even more so depending on how her companions interact with her and the gallery in general.]] Garry [[OnlySaneMan is probably the sanest of the three]] and only starts slipping mentally [[KarmaMeter if the player lets him]]. [[spoiler:If Garry fails the doll room event, he gets brainwashed by the dolls. Generally a good slap on the face is all it takes to bring him back, but if he's been kicking over a lot of artworks before that point, the damage to his mind is permanent.]]
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* Salvatore Leon from ''GrandTheftAuto'' comes off as a friendly, if ruthless man in ''3'', only to [[spoiler:try and have Claude killed because he suddenly becomes convinced Claude's a spy]]. ''Liberty City Stories'' shows that he had fits of extreme paranoia before this, one time nearly blowing [[TheLancer Tony's]] head off while accusing him of scheming behind his back. [[spoiler:''San Andreas'' reveals that this extreme paranoia was caused by CJ playing him (and pretty much every other faction that was involved) for a fool in the game's bank heist arc.]]
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* Salvatore Leon from ''GrandTheftAuto'' ''VideoGame/GrandTheftAuto'' comes off as a friendly, if ruthless man in ''3'', ''VideoGame/GrandTheftAuto3'', only to [[spoiler:try and have Claude killed because he suddenly becomes convinced Claude's a spy]]. ''Liberty City Stories'' shows that he had fits of extreme paranoia before this, one time nearly blowing [[TheLancer Tony's]] head off while accusing him of scheming behind his back. [[spoiler:''San Andreas'' [[spoiler:''VideoGame/GrandTheftAutoSanAndreas'' reveals that this extreme paranoia was caused by CJ playing him (and pretty much every other faction that was involved) for a fool in the game's bank heist arc.]]
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* In ''VideoGame/TheSims 2'', if a Sim's aspiration meter bottoms out, they'll start doing crazy stuff related to their Aspiration:
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* In ''VideoGame/TheSims 2'', if a Sim's aspiration meter bottoms out, is very low, they'll start doing crazy stuff related to their Aspiration:
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*** and when it bottoms out completely they will collapse on the ground babbling, and a therapist (who is only visible when that sim is selected) will appear and talk to them for a while, moving their aspiration meter back up one level.
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* Happens to Eddie in VideoGame/SilentHill2. He starts off as a scared yet lazy kid, but later on [[spoiler: he kills a couple of men and threatens to kill James]]. In truth, he's been [[spoiler: crazy all along]], just like [[spoiler: James]].
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* Salvatore Leon from ''GrandTheftAuto'' comes off as a friendly, if ruthless man in ''3'', only to [[spoiler:try and have Claude killed because he suddenly becomes convinced Claude's a spy]]. ''Liberty City Stories'' shows that he had fits of extreme paranoia before this, one time nearly blowing [[TheLancer Tony's]] head off while accusing him of scheming behind his back. [[spoiler:''San Andreas'' reveals that this extreme paranoia was caused by CJ playing him (and pretty much every other faction that was involved) for a fool in the game's bank heist arc.]]
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Added the Dragon Age II example.
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* ''VideoGame/DragonAgeII:'' [[spoiler: Anders]] slowly gets driven mad by Justice over the course of the game, slipping from [[WellIntentionedExtremist strong supporter of the mages to crazy extremist,]] becoming completely consumed with his cause. His views become so extreme that you're either [[WithUsOrAgainstUs with his cause or an enemy to it.]] His madness culminates when he [[spoiler: blows up the Chantry to force a confrontation between the mages and Templars.]]
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----
* (Some of) The characters in ''VideoGame/{{Psychonauts}}'' whose minds you enter, but especially the ones in the asylum levels.
* This is a major gameplay element in ''VideoGame/CallOfCthulhuDarkCornersOfTheEarth.'' The "hero" is slowly going insane due to all the {{Eldritch Abomination}}s running around. This results in hallucinations, talking to himself, and hearing voices. The player can reduce the rate at which he goes insane by keeping him from being exposed to disturbing situations (this being a horror story based on the works of H.P. Lovecraft, that's easier said than done). If it gets too bad, the hero may attempt suicide and prompt a NonstandardGameOver.
* ''VideoGame/YggdraUnion'' has [[spoiler:Nessiah]], who is quite clearly struggling to stay sane by the end of the game. Considering the [[TraumaCongaLine particularly brutal]] BreakTheCutie he was subjected to in the past (and [[WhoWantsToLiveForever how long he's had to live with the trauma]]), his Sanity Slippage is pretty understandable.
* ''VideoGame/EternalDarkness'' has this as one of its main gameplay mechanics with a "sanity gauge" that drops whenever enemies are encountered. Once it gets low, the ''[[NightmareFuel really]]'' [[MindScrew weird shit]] kicks in.
-->"This...isn't...really happening!"
* Sakura in ''VisualNovel/FateStayNight''. It's like everything anyone ever says to her is another stab at her self confidence. And then Shinji tries [[spoiler:to rape her one more time, and then he'll tell Shirou about it]]. Yeahhhh things kind of go downhill from there. [[spoiler:Oh, and she was already eating people in her sleep, passing out frequently and also quietly going crazy anyway.]]
** [[spoiler:She does get better, however]].
* ''VideoGame/SidMeiersAlphaCentauri'': If you're really kicking the crap out of another faction and refuse to accept their surrender, they send you increasingly-crazy messages until you kill them or otherwise stop the war.
* In the Creator/ParadoxInteractive RealTimeStrategy game ''VideoGame/CrusaderKings'', characters can occasionally become Stressed. In itself, this only causes a slight stat hit, but if left unchecked, Stress can further worsen into Depression, Schizophrenia, or outright Insanity, and once one of those hits, that character is locked in a vicious spiral of stat decay, personality instability, and possibly even murderous sociopathy until he or she finally dies or gets "Locked Up for Good!" (which is effectively the same thing).
* This shows up in ''VideoGame/{{Borderlands}}'' through [[ApocalypticLog Patricia Tannis' logs]]. She starts out sane (if unenthusiastic) on Pandora and the combination of [[DeathWorld the world's environment]] and [[GoMadFromTheIsolation too much time alone]] pushes her from "Why do I have to be here?" to idle chitchat with someone pinned and dying under a stone pillar because she knows it's the last conversation she'll have with anyone for awhile to dating, then breaking up with, [[CargoShip her audio recorder]] (they're still friends though). All this occurs prior to the events of the game and by the time you meet her she's...[[CloudCuckoolander a bit off]].
** She also gives a dude named Crazy Earl an artifact to safeguard, and to seal the deal, some of her underwear as well. It was her idea too. Also, Baron Flynt punched her dog.
** Tannis explains in the sequel how she became a bit nutty and how the bandits came to be on Pandora. Her and several people used to work for the Dahl corporation and they were sent to Pandora to mine for minerals and do research studies. After a while, the corporation ditched everyone and left them to fend for themselves, causing many people who were normal and had decent lives to slowly grow insane and become bandits. While Tannis simply became just plain weird, she admits that what Dahl did left her and many others broken.
** Tiny Tina, world's deadliest 13 year old. The reason behind her total loss of sanity? [[spoiler:Flesh Stick (I'm not kidding, that's the guy's name), sold her and her parents to Handsome Jack, for his Slag experimentation. Her mother gave her a grenade and taught her how to use. What next? Handsome Jack used them as guinea pigs. Seeing her parents mutate due to slag, Tiny Tina ran away after putting the grenade to a good use.]] Ever since, she went a bit nuts... BURN ALL THE BABIES!!!!
* This is arguably the entire plot arc for Atris in ''[[VideoGame/KnightsOfTheOldRepublic KotOR II]]''.
** And possibly for Bastila in the first game, though the final stages happened offscreen.
** In a somewhat stranger example, [[spoiler:Revan]] in ''The Old Republic''. [[spoiler:After three hundred years of being [[FateWorseThanDeath trapped in stasis]] and {{mind rape}}d by the Sith Emperor, (all the while subtly influencing him NOT to attack the Republic)]] he's broken out by a strike team..... Only to [[spoiler:immediately go to one of the remaining Star Forges in the galaxy (you know, the EldritchLocation]] he spent the better part of the first game trying to destroy?) and [[spoiler:attempts to build a robotic army that will wipe out all those in the galaxy that contain even a trace of the Sith gene in them-incidentally 97.8% of the Imperial population.]] Not that, given his situation, this isn't ''slightly'' justified.
* This plays out in reverse in ''VideoGame/TimeFcuk''. The protagonist is a HeroicMime, but due to the unusual nature of time and space in the game, he often gets radio messages from his past and future self. In the beginning, you're getting messages from what seem to be several future selves, ranging from a PerkyGoth to a ConspiracyTheorist to someone who's flat-out hallucinating. Towards the end, you can hear his early messages, when he was TheEveryman-- making it scarier, now that you know exactly how he'll be broken.
* This is the result of the third week of ''VisualNovel/CrossChannel'', the first week where Taichi knows [[spoiler:time is looping]] and has more of his deep psychological issues surface. If it wasn't for this and the broadcast he makes at the end of that week, this treatment of Kiri would be rather hypocritical and [[MoralEventHorizon unforgivable]].
* ''VideoGame/VampireTheMasqueradeBloodlines'' featured a quest in which one has to "cleanse" a haunted hotel (much akin to ''Literature/TheShining''). Upon finding the diary of a woman whose ghost now lives in the house, one can read her tale of how her husband experienced one of these inspired by [[LoveMakesYouEvil romantic jealousy]], culminating in him [[spoiler: murdering her and her two children and killing himself]].
* Kefka in ''VideoGame/FinalFantasyVI''. He was once a general, but he starts disobeying orders and has lost his rank by the time the game's narrative begins. And he just keeps getting worse from there, culminating in the development of a [[AGodAmI massive god complex]] and [[OmnicidalManiac an urge to destroy everything]].
* Fentible of ''VideoGame/StarshipTitanic'' suffers for these occasional, usually in mid conversation. The end result is mostly rudeness and forgetfulness. Thankfully he can be reset.
* In ''Schizophrenzy'', you play Private Investigator John K. Facey - a severe schizophrenic. Your sanity is represented by a sort of "health meter" and is constantly decreasing, with only your medication keeping you from going completely over the edge. Of course, even fully medicated you perceive yourself as walking on walls and hallucinate bizarre creatures.
* In ''VideoGame/TheSims 2'', if a Sim's aspiration meter bottoms out, they'll start doing crazy stuff related to their Aspiration:
** A Romance Sim will try to dance with a mop...
** A Popularity Sim will start talking to a puppet made out of a plastic cup...
** A Family Sim will cuddle a flour sack with a face drawn on it like it was a real baby...
** A Knowledge Sim will start talking to [[Film/CastAway a volleyball with a face painted on it]] wearing a mortarboard...
** A Pleasure Sim will [[LampshadeWearing put a lampshade on their head]] and dance around like an idiot...
** And a Fortune Sim will go out on the street and beg for money.
* ''VisualNovel/NineHoursNinePersonsNineDoors'' has [[spoiler: Clover, waking up and being forced into playing the Nonary Game. For a second time. She is fine over this. What gives her a dive in the deep end, is Snake's death. Apparent in the "[[MultipleEndings Axe]]" ending.]]
** [[spoiler: The [[WordOfGod author has suggested]] that something traumatic changed Akane in the previous Nonary Game, leaving her cold, vengeful and capable of eliminating everyone who gets in her way.]]
* ''[[VideoGame/AssassinsCreedI Assassin's Creed]]'' had mentions of Subject 16, who committed suicide after excessively prolonged Animus sessions caused mental breakdown due to the "Bleeding Effect," where the Animus subject may gain their ancestor's abilities but end up being unable to mentally distinguish themselves from the ancestor, though Desmond only ends up gaining his ancestor Altaïr's Eagle Vision ability. In ''VideoGame/AssassinsCreedII'' this is deliberately invoked in an attempt to quickly train Desmond to become an Assassin, but along the way Desmond suffers visual hallucinations and experience (in his sleep) one of Altaïr's memories without being in the Animus. By ''VideoGame/AssassinsCreedBrotherhood'' he's become an Animus-trained Assassin but the hallucinations have gotten more frequent, are now both visual and auditory (sight and sound) and may not even be from his ancestor Ezio's memories. On at least two occasions Desmond inadvertently refers to himself in the first-person when describing Ezio's actions, and later in the game an e-mail reveals that the other modern-day Assassins have heard Desmond screaming in his sleep.
** Just to [[FromBadToWorse make it worse]], Desmond is self-conscious of his own growing mental instability, at one point in ''Brotherhood'' wondering how long it'll be before he "[[RoomFullOfCrazy starts painting symbols on the walls]]" (referencing Subject 16).
* The ''VideoGame/ShadowHearts'' games, along with the usual HP and MP gauges, also feature a Sanity Gauge, as the characters are constantly fighting horrific and twisted abominations. If the Sanity of any character slips below zero, the [[HellIsThatNoise background music changes]] and the character goes berserk, attacking everything around them.
* Sergeant Michael Becket of ''[[VideoGame/FirstEncounterAssaultRecon F.E.A.R. 2]]''. A combination of Alma's MindRape powers, [[spoiler: her actually raping him]], and being held captive by Armacham for nine months while being continuously tested and experimented on has driven him gradually insane by the time ''F.3.A.R.'' rolls around.
* ''[[VideoGame/DevilSurvivor Shin Megami Tensei: Devil Survivor]]'' has an odd example of an ''[[AIIsACrapshoot AI]]'' apparently undergoing this. [[MadOracle The Laplace Mail]] starts out giving news from the future, but as the game wears on (and the protagonists [[ScrewDestiny repeatedly prevent its predictions from coming true]]), it starts to get glitchier and glitchier, first capitalizing random letters and eventually adding in weird symbols in place of them, changing its "Have a nice day" ending to "Have a nice ''death''", and finally spitting out an error message and discontinuing all together.
* [[spoiler:Pit]] of all people starts to go crazy in ''VideoGame/KidIcarusUprising''. [[spoiler:In chapter 23, he gets eaten by Hades after the 3 Sacred Treasures are destroyed in front of him. When he's eaten, [[GoMadFromtheIsolation he's isolated from the outside world]] and can't get into contact with Palutena. Only Hades can talk to him from the inside and constantly [[MindRape taunts him]] the whole dungeon.]] It gets to the point where [[spoiler:Pit starts talking to himself and acting like he's going crazy.]] Then there's [[spoiler:[[BreakTheCutie chapters 18-21]].]]
* Martin Walker, the main character of ''VideoGame/SpecOpsTheLine'' spends most of the game slowly going crazy trying to justify what he did during the [[spoiler:white phosphorous incident]] to the point of [[spoiler:imagining entire conversations with the dead villain]] to somehow make it so that he was forced into his actions. The language he uses also gradually devolves from professional military expressions, to loud, insane {{Battle Cr|y}}ies consisting mostly of angry rambling and cursing of his enemies.
* The title character of ''VideoGame/{{Iji}}'' can experience this, depending on player actions/inactions. She becomes increasingly desperate and maniacal if her body count increases rapidly (going from crying [[ApologeticAttacker "I'm sorry!"]] to those she kills to shouting "DIE!"). She also swiftly goes completely unhinged if [[spoiler:Dan is killed]], even the [[AntiVillain final boss]] shows sympathy for her state.
* Matthew Baker from VideoGame/BrothersInArms follows this trope as the stress from losing squadmates and friends begins to pile up.
* All over ''Franchise/DeadSpace''. Alongside the [[ZombieApocalypse Necromorphs]], [[ArtifactOfDoom The Markers]] cause [[MindRape hallucinations, homicidal and suicidal ideation, paranoia, and a whole host of other pleasant symptoms]]. Most characters in the series are affect at least to some degree. [[spoiler: Including protagonist Isaac Clarke, whose deteriorating mental state was TheReveal in the original game and a major plot element in ''2'', where he had to find a way to stop his insanity before it made him kill himself.]]
* In ''VideoGame/BioShock'' anyone who is hooked on ADAM will slowly loses their sanity, as it destroys and rebuilds their physical and mental state. The best example is Dr. Steinman, in his audio diaries he becomes increasingly delusional, beleving he's talking to the Greek goddess Aphrodite, and spends most of his time doing surgery on other splicers to create his version of what is beautiful.
-->'''Steinman:''' An intruder?! He's ugly! Ugly! Ugly! UGLYYYYYYYY!
* In ''VideoGame/DontStarve'', your character has a SanityMeter that slowly goes down if you neglect it. If it gets low enough, you start seeing flickering visions of shadowy monsters. Let it drop even lower, and various crazy things happen: the wild rabbits roaming the land become replaced with monsters made of hair called Beardlings, shadowy hands might reach out to snuff out your campfire at night as an OminousMusicBoxTune plays, and the shadowy monsters you see become more and more real until they ''[[YourMindMakesItReal come to life and try to kill you]]''.
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* (Some of) The characters in ''VideoGame/{{Psychonauts}}'' whose minds you enter, but especially the ones in the asylum levels.
* This is a major gameplay element in ''VideoGame/CallOfCthulhuDarkCornersOfTheEarth.'' The "hero" is slowly going insane due to all the {{Eldritch Abomination}}s running around. This results in hallucinations, talking to himself, and hearing voices. The player can reduce the rate at which he goes insane by keeping him from being exposed to disturbing situations (this being a horror story based on the works of H.P. Lovecraft, that's easier said than done). If it gets too bad, the hero may attempt suicide and prompt a NonstandardGameOver.
* ''VideoGame/YggdraUnion'' has [[spoiler:Nessiah]], who is quite clearly struggling to stay sane by the end of the game. Considering the [[TraumaCongaLine particularly brutal]] BreakTheCutie he was subjected to in the past (and [[WhoWantsToLiveForever how long he's had to live with the trauma]]), his Sanity Slippage is pretty understandable.
* ''VideoGame/EternalDarkness'' has this as one of its main gameplay mechanics with a "sanity gauge" that drops whenever enemies are encountered. Once it gets low, the ''[[NightmareFuel really]]'' [[MindScrew weird shit]] kicks in.
-->"This...isn't...really happening!"
* Sakura in ''VisualNovel/FateStayNight''. It's like everything anyone ever says to her is another stab at her self confidence. And then Shinji tries [[spoiler:to rape her one more time, and then he'll tell Shirou about it]]. Yeahhhh things kind of go downhill from there. [[spoiler:Oh, and she was already eating people in her sleep, passing out frequently and also quietly going crazy anyway.]]
** [[spoiler:She does get better, however]].
* ''VideoGame/SidMeiersAlphaCentauri'': If you're really kicking the crap out of another faction and refuse to accept their surrender, they send you increasingly-crazy messages until you kill them or otherwise stop the war.
* In the Creator/ParadoxInteractive RealTimeStrategy game ''VideoGame/CrusaderKings'', characters can occasionally become Stressed. In itself, this only causes a slight stat hit, but if left unchecked, Stress can further worsen into Depression, Schizophrenia, or outright Insanity, and once one of those hits, that character is locked in a vicious spiral of stat decay, personality instability, and possibly even murderous sociopathy until he or she finally dies or gets "Locked Up for Good!" (which is effectively the same thing).
* This shows up in ''VideoGame/{{Borderlands}}'' through [[ApocalypticLog Patricia Tannis' logs]]. She starts out sane (if unenthusiastic) on Pandora and the combination of [[DeathWorld the world's environment]] and [[GoMadFromTheIsolation too much time alone]] pushes her from "Why do I have to be here?" to idle chitchat with someone pinned and dying under a stone pillar because she knows it's the last conversation she'll have with anyone for awhile to dating, then breaking up with, [[CargoShip her audio recorder]] (they're still friends though). All this occurs prior to the events of the game and by the time you meet her she's...[[CloudCuckoolander a bit off]].
** She also gives a dude named Crazy Earl an artifact to safeguard, and to seal the deal, some of her underwear as well. It was her idea too. Also, Baron Flynt punched her dog.
** Tannis explains in the sequel how she became a bit nutty and how the bandits came to be on Pandora. Her and several people used to work for the Dahl corporation and they were sent to Pandora to mine for minerals and do research studies. After a while, the corporation ditched everyone and left them to fend for themselves, causing many people who were normal and had decent lives to slowly grow insane and become bandits. While Tannis simply became just plain weird, she admits that what Dahl did left her and many others broken.
** Tiny Tina, world's deadliest 13 year old. The reason behind her total loss of sanity? [[spoiler:Flesh Stick (I'm not kidding, that's the guy's name), sold her and her parents to Handsome Jack, for his Slag experimentation. Her mother gave her a grenade and taught her how to use. What next? Handsome Jack used them as guinea pigs. Seeing her parents mutate due to slag, Tiny Tina ran away after putting the grenade to a good use.]] Ever since, she went a bit nuts... BURN ALL THE BABIES!!!!
* This is arguably the entire plot arc for Atris in ''[[VideoGame/KnightsOfTheOldRepublic KotOR II]]''.
** And possibly for Bastila in the first game, though the final stages happened offscreen.
** In a somewhat stranger example, [[spoiler:Revan]] in ''The Old Republic''. [[spoiler:After three hundred years of being [[FateWorseThanDeath trapped in stasis]] and {{mind rape}}d by the Sith Emperor, (all the while subtly influencing him NOT to attack the Republic)]] he's broken out by a strike team..... Only to [[spoiler:immediately go to one of the remaining Star Forges in the galaxy (you know, the EldritchLocation]] he spent the better part of the first game trying to destroy?) and [[spoiler:attempts to build a robotic army that will wipe out all those in the galaxy that contain even a trace of the Sith gene in them-incidentally 97.8% of the Imperial population.]] Not that, given his situation, this isn't ''slightly'' justified.
* This plays out in reverse in ''VideoGame/TimeFcuk''. The protagonist is a HeroicMime, but due to the unusual nature of time and space in the game, he often gets radio messages from his past and future self. In the beginning, you're getting messages from what seem to be several future selves, ranging from a PerkyGoth to a ConspiracyTheorist to someone who's flat-out hallucinating. Towards the end, you can hear his early messages, when he was TheEveryman-- making it scarier, now that you know exactly how he'll be broken.
* This is the result of the third week of ''VisualNovel/CrossChannel'', the first week where Taichi knows [[spoiler:time is looping]] and has more of his deep psychological issues surface. If it wasn't for this and the broadcast he makes at the end of that week, this treatment of Kiri would be rather hypocritical and [[MoralEventHorizon unforgivable]].
* ''VideoGame/VampireTheMasqueradeBloodlines'' featured a quest in which one has to "cleanse" a haunted hotel (much akin to ''Literature/TheShining''). Upon finding the diary of a woman whose ghost now lives in the house, one can read her tale of how her husband experienced one of these inspired by [[LoveMakesYouEvil romantic jealousy]], culminating in him [[spoiler: murdering her and her two children and killing himself]].
* Kefka in ''VideoGame/FinalFantasyVI''. He was once a general, but he starts disobeying orders and has lost his rank by the time the game's narrative begins. And he just keeps getting worse from there, culminating in the development of a [[AGodAmI massive god complex]] and [[OmnicidalManiac an urge to destroy everything]].
* Fentible of ''VideoGame/StarshipTitanic'' suffers for these occasional, usually in mid conversation. The end result is mostly rudeness and forgetfulness. Thankfully he can be reset.
* In ''Schizophrenzy'', you play Private Investigator John K. Facey - a severe schizophrenic. Your sanity is represented by a sort of "health meter" and is constantly decreasing, with only your medication keeping you from going completely over the edge. Of course, even fully medicated you perceive yourself as walking on walls and hallucinate bizarre creatures.
* In ''VideoGame/TheSims 2'', if a Sim's aspiration meter bottoms out, they'll start doing crazy stuff related to their Aspiration:
** A Romance Sim will try to dance with a mop...
** A Popularity Sim will start talking to a puppet made out of a plastic cup...
** A Family Sim will cuddle a flour sack with a face drawn on it like it was a real baby...
** A Knowledge Sim will start talking to [[Film/CastAway a volleyball with a face painted on it]] wearing a mortarboard...
** A Pleasure Sim will [[LampshadeWearing put a lampshade on their head]] and dance around like an idiot...
** And a Fortune Sim will go out on the street and beg for money.
* ''VisualNovel/NineHoursNinePersonsNineDoors'' has [[spoiler: Clover, waking up and being forced into playing the Nonary Game. For a second time. She is fine over this. What gives her a dive in the deep end, is Snake's death. Apparent in the "[[MultipleEndings Axe]]" ending.]]
** [[spoiler: The [[WordOfGod author has suggested]] that something traumatic changed Akane in the previous Nonary Game, leaving her cold, vengeful and capable of eliminating everyone who gets in her way.]]
* ''[[VideoGame/AssassinsCreedI Assassin's Creed]]'' had mentions of Subject 16, who committed suicide after excessively prolonged Animus sessions caused mental breakdown due to the "Bleeding Effect," where the Animus subject may gain their ancestor's abilities but end up being unable to mentally distinguish themselves from the ancestor, though Desmond only ends up gaining his ancestor Altaïr's Eagle Vision ability. In ''VideoGame/AssassinsCreedII'' this is deliberately invoked in an attempt to quickly train Desmond to become an Assassin, but along the way Desmond suffers visual hallucinations and experience (in his sleep) one of Altaïr's memories without being in the Animus. By ''VideoGame/AssassinsCreedBrotherhood'' he's become an Animus-trained Assassin but the hallucinations have gotten more frequent, are now both visual and auditory (sight and sound) and may not even be from his ancestor Ezio's memories. On at least two occasions Desmond inadvertently refers to himself in the first-person when describing Ezio's actions, and later in the game an e-mail reveals that the other modern-day Assassins have heard Desmond screaming in his sleep.
** Just to [[FromBadToWorse make it worse]], Desmond is self-conscious of his own growing mental instability, at one point in ''Brotherhood'' wondering how long it'll be before he "[[RoomFullOfCrazy starts painting symbols on the walls]]" (referencing Subject 16).
* The ''VideoGame/ShadowHearts'' games, along with the usual HP and MP gauges, also feature a Sanity Gauge, as the characters are constantly fighting horrific and twisted abominations. If the Sanity of any character slips below zero, the [[HellIsThatNoise background music changes]] and the character goes berserk, attacking everything around them.
* Sergeant Michael Becket of ''[[VideoGame/FirstEncounterAssaultRecon F.E.A.R. 2]]''. A combination of Alma's MindRape powers, [[spoiler: her actually raping him]], and being held captive by Armacham for nine months while being continuously tested and experimented on has driven him gradually insane by the time ''F.3.A.R.'' rolls around.
* ''[[VideoGame/DevilSurvivor Shin Megami Tensei: Devil Survivor]]'' has an odd example of an ''[[AIIsACrapshoot AI]]'' apparently undergoing this. [[MadOracle The Laplace Mail]] starts out giving news from the future, but as the game wears on (and the protagonists [[ScrewDestiny repeatedly prevent its predictions from coming true]]), it starts to get glitchier and glitchier, first capitalizing random letters and eventually adding in weird symbols in place of them, changing its "Have a nice day" ending to "Have a nice ''death''", and finally spitting out an error message and discontinuing all together.
* [[spoiler:Pit]] of all people starts to go crazy in ''VideoGame/KidIcarusUprising''. [[spoiler:In chapter 23, he gets eaten by Hades after the 3 Sacred Treasures are destroyed in front of him. When he's eaten, [[GoMadFromtheIsolation he's isolated from the outside world]] and can't get into contact with Palutena. Only Hades can talk to him from the inside and constantly [[MindRape taunts him]] the whole dungeon.]] It gets to the point where [[spoiler:Pit starts talking to himself and acting like he's going crazy.]] Then there's [[spoiler:[[BreakTheCutie chapters 18-21]].]]
* Martin Walker, the main character of ''VideoGame/SpecOpsTheLine'' spends most of the game slowly going crazy trying to justify what he did during the [[spoiler:white phosphorous incident]] to the point of [[spoiler:imagining entire conversations with the dead villain]] to somehow make it so that he was forced into his actions. The language he uses also gradually devolves from professional military expressions, to loud, insane {{Battle Cr|y}}ies consisting mostly of angry rambling and cursing of his enemies.
* The title character of ''VideoGame/{{Iji}}'' can experience this, depending on player actions/inactions. She becomes increasingly desperate and maniacal if her body count increases rapidly (going from crying [[ApologeticAttacker "I'm sorry!"]] to those she kills to shouting "DIE!"). She also swiftly goes completely unhinged if [[spoiler:Dan is killed]], even the [[AntiVillain final boss]] shows sympathy for her state.
* Matthew Baker from VideoGame/BrothersInArms follows this trope as the stress from losing squadmates and friends begins to pile up.
* All over ''Franchise/DeadSpace''. Alongside the [[ZombieApocalypse Necromorphs]], [[ArtifactOfDoom The Markers]] cause [[MindRape hallucinations, homicidal and suicidal ideation, paranoia, and a whole host of other pleasant symptoms]]. Most characters in the series are affect at least to some degree. [[spoiler: Including protagonist Isaac Clarke, whose deteriorating mental state was TheReveal in the original game and a major plot element in ''2'', where he had to find a way to stop his insanity before it made him kill himself.]]
* In ''VideoGame/BioShock'' anyone who is hooked on ADAM will slowly loses their sanity, as it destroys and rebuilds their physical and mental state. The best example is Dr. Steinman, in his audio diaries he becomes increasingly delusional, beleving he's talking to the Greek goddess Aphrodite, and spends most of his time doing surgery on other splicers to create his version of what is beautiful.
-->'''Steinman:''' An intruder?! He's ugly! Ugly! Ugly! UGLYYYYYYYY!
* In ''VideoGame/DontStarve'', your character has a SanityMeter that slowly goes down if you neglect it. If it gets low enough, you start seeing flickering visions of shadowy monsters. Let it drop even lower, and various crazy things happen: the wild rabbits roaming the land become replaced with monsters made of hair called Beardlings, shadowy hands might reach out to snuff out your campfire at night as an OminousMusicBoxTune plays, and the shadowy monsters you see become more and more real until they ''[[YourMindMakesItReal come to life and try to kill you]]''.
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