History WalkingSpoiler / VideoGames

** Part of the reason why [[BigBad Dimitri Rascalov]] is such a huge spoiler is how reasonable he seems compared to his more unstable boss [[AddledAddict Mikhail Faustin]] or when considering [[HumanTraffickers Ray Bulgarin's]] [[DarkAndTroubledPast past with Niko]]. The game sets Faustin and Bulgarin up as candidates for the BigBad of the story, while Dimitri is more mild-mannered and helpful. Not only is his betrayal a complete shock, but Dimitri makes a huge 180, going from Faustin's beleaguered lieutenant to a [[ChronicBackStabbingDisorder backstabbing]], [[AxCrazy murderous]], [[EvilIsPetty vindictive]] Jerkass. burning down Roman's home and business, and relentlessly trying to kill the Bellics.

** The fact that Florian Cravic and Darko Brevic are the people Niko believes betrayed isn't itself a spoiler. The fact that Florian is not only innocent but has moved on and come out as gay is. Likewise for Darko, the fact that he is the traitor who was driven by drug addiction and rage towards the atrocities Niko's friends committed is a huge spoiler.

* ''VideoGame/{{ULTRAKILL}}'' has a character who if you even describe them ''as'' a character spoils the end of a massive reveal that came at the end of an AlternateRealityGame put out at the end of Act II: {{Hell}} is no mere EldritchLocation. It's a [[GeniusLoci living]], [[ItCanThink thinking]], [[AdaptationalVillainy cruel]] superorganism that is being set up as the closest thing the game has to a BigBad.

*** Every character introduced in the [[WhamEpisode School kingdom]], including Nakabachi (the corrupt music teacher who became mad after Toshiro and Eri exposed his crimes to the student body, and who we're initially led to believe is the kingdom's ruler), Eri (whose appearance inspired Erina and who is suggested to die after getting pushed in the way of a train by a now-insane Nakabachi, only for TheStinger to reveal she survived, albeit with life-altering injuries), and Shadow Toshiro (the true ruler and boss of the kingdom).

** Part of the reason why [[BigBad Dimitri Rascalov]] is such a huge spoiler is how reasonable he seems compared to his more unstable boss [[AddledAddict Mikhail Faustin]] or when considering [[HumanTraffickers Ray Bulgarin's]] [[DarkAndTroubledPast past with Niko]]. The game sets Faustin and Bulgarin up as candidates for the BigBad of the story, while Dimitri is more mild-mannered and helpful. Not only is his betrayal a complete shock, but Dimitri's true nature is a huge 180 from his apparent status as the beleaguered second-in-command to Faustin. Once he betrays the Bellics, he burns down Roman's home and business, and relentlessly tries to kill them.

** Primrose Azelhart's story: [[MadArtist Simeon]] initially appears to be a kind and considerate gentleman and a potential LoveInterest for Primrose, but is eventually revealed to be the secret leader of the Obsidians, responsible for the murder of her father, and a [[{{Sadist}} sadistic]] [[TheSociopath sociopath]] who had gone out of his way to become close to Primrose in her childhood so as to inflict maximum emotional pain on her [[ItAmusedMe for his own amusement]], bearing the mark of the crow on his neck.

* ''VideoGame/DonkeyKongCountryReturns'': Tiki Tong. Normally, if you lose a life in a specific world's level, you get a silhouette of its leading instrument tiki's face as the screen transitions to the lose a life screen. In the volcano, which is the last world, Tiki Tong's face is replaced with a question mark before you meet him.

* In ''VideoGame/PuyoPuyoTetris2'', Squares is inherently a spoiler since he is the one who controlled Marle, his creator, into gathering power and wants to unmerge the Puyo Puyo and Tetris worlds to maintain order. Until his introduction, Marle is thought to be the cause of the game's conflict.

** Beating either ??? or The Lamb allows you to fight the statues in the Angels Rooms, who formerly just gave you an item in the Wrath of the Lamb DLC. Beating two angel statues allows you to fight the definitive true final boss of the game: Mega Satan.

** Judd the Cat is a straight example, as it is impossible to explain why there's a random cat living among these SurprisinglyHumanMerfolk without delving into the BackstoryHorror of the ''Splatoon'' world, which is hidden in StoryBreadcrumbs in the first game. This has since been downplayed, as future entries are [[LateArrivalSpoiler pretty open]] about the games taking place AfterTheEnd.

** DJ Octavio, the FinalBoss of the first two games, is an unusual example in that he's not a Walking Spoiler due to plot reasons (though he has a few surprises). Rather, his characterization and boss fight in [[VideoGame/Splatoon1 the first game]] was so unique and fun that fans spent several months being very reluctant to give away details to unknowing players. None of what occurs during this fight was even hinted at, which adds on to the trope.
** Judd the Cat is a straight example, as it is impossible to explain why there's a random cat here without delving into the BackstoryHorror of the ''Splatoon'' world, which was hidden in StoryBreadcrumbs in the first game. This has since been downplayed, as future entries are [[LateArrivalSpoiler pretty open]] about the games taking place AfterTheEnd.

** ''VideoGame/Splatoon3'': Deep Cut were marketed like the idol groups of the past two games, but there's a big difference the trailers made no mention of: [[spoiler: they're initially ''antagonists'' in Story Mode and make up most of its boss fights. Granted it turns out to be over a misunderstanding, but it's still the first time an idol group hasn't been on the player's side.]]

* ''VideoGame/OuterWilds'': The DrivingQuestion of the ''Echoes of the Eye'' DLC is "What is inside that mysterious vault, and why was it sealed away?" Thus, merely stating that [[SealedGoodInACan The Prisoner]] exists already spoils the first part of the question, but discussing any of their actions spoils the second part.

*** The regional professors of Paldea, Sada and Turo have been DeadAllAlong. The player has been only interacting with their {{robot|Me}} copies, and the original professors turned out to be responsible for creating a time machine that brings in Pokémon from other time periods into the present-day ecosystem not suited to handle them, and the robot copies wants the player to stop it.

* ''Franchise/MetalGear''

* ''VideoGame/{{Fallout}}''

** Raiden Makoto is impossible to discuss without revealing that Ei, the current God of Eternity, isn't the original Electro Archon, but rather her BackupTwin who took over after Makoto perished during the [[CataclysmBackstory Khaenri'ahn Cataclysm]] 500 years ago, and that most of Inazuma is unaware of this. Even before that comes TheReveal that the Raiden Shogun seen through the first half of Chapter II is actually a [[RidiculouslyHumanRobots puppet]] duplicate, while the ''real'' Ei is [[Hikikomori hiding in the Plane of Euthymia]].

** Raiden Makoto is impossible to discuss without revealing that Ei, the current Raiden Shogun, isn't the original Electro Archon, but rather her BodyDouble BackupTwin who took over after Makoto perished during the [[CataclysmBackstory Khaenri'ahn Cataclysm]] 500 years ago, and that most of Inazuma is unaware of this.

** Makoto Kagutsuchi, the CEO of Amaterasu Corporation, is actually the BigBad who was EvilAllAlong, and it's impossible to say anything about him beyond his surface-level persona presented prior to TheReveal without stating that he's the culprit behind the Great Global Mystery case who's been kidnapping criminals for Kanai Ward's food supply, or that he's actually Number One's homunculus clone, and his identity as a homunculus also spoils that everyone else in Kanai Ward is also a homunculus, as it's his ''own'' angst over being a homunculus that drives his extremist actions.
** Dr. Huesca, Amaterasu Corporation's head researcher, where his existence also spoils the identity of the company's head researcher, a mystery unanswered prior to his reveal, and also reveals the story's OntologicalMystery, as his actions in the backstory caused the game's present day conflict as a result of his experiments. It's also impossible to describe him without, in turn, spoiling his relationship with Peacekeeper director Yomi, and, consequently, that said relationship is why Yomi manipulated Yakou Furio into killing him.

* ''[[Videogame/AlteredBeast Project Altered Beast]]'' has Anastasia, a MysteriousWaif who appears to help the hero, but is actually the responsible for the whole mess that brought him into the game's setting in the first place (as she wants to kill him, and everyone related to the Project), and even serves as the FinalBoss.