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* ''TabletopGame/TwoRoomsAndABoom'' Is a variant where the two teams are of equal size. Players are divided into two teams and are distributed into two rooms. One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.

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* ''TabletopGame/TwoRoomsAndABoom'' Is a variant where the two teams are of equal size. Players are divided into two teams and are distributed into two rooms. One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not. If there is a odd number of players, then one player is the gambler, whose goal is to predict which team will win.
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* ''TableTopGame/TwoRoomsAndABoom'' Is a variant where the two teams are of equal size. Players are divided into two teams and are distributed into two rooms. One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.

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* ''TableTopGame/TwoRoomsAndABoom'' ''TabletopGame/TwoRoomsAndABoom'' Is a variant where the two teams are of equal size. Players are divided into two teams and are distributed into two rooms. One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.
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* ''TableTopGame/TwoRoomsAndABoom'' Players are divided into two team and are distributed into two rooms One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.

to:

* ''TableTopGame/TwoRoomsAndABoom'' Is a variant where the two teams are of equal size. Players are divided into two team teams and are distributed into two rooms rooms. One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.
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* ''TableTopGame/TwoRoomsAndABoom'' Players are divided into two team and are distributed into two rooms One team has a bomber and the other has a president. During each round, some players will switch rooms. The team with the bomber wins if the bomber and president are in the same room at the end of the game, and the other team wins if they are not.
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See also AsymmetricMultplayer and VariablePlayerGoals.

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See also AsymmetricMultplayer AsymmetricMultiplayer and VariablePlayerGoals.
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See also AsymetricMultplayer and VariablePlayerRoles.

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See also AsymetricMultplayer AsymmetricMultplayer and VariablePlayerRoles.
VariablePlayerGoals.
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See also AsymetricMultplayer and VariablePlayerRoles.
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* ''TabletopGame/OneNightUltimateWerewolf'' simplifies the formula. The entire game takes place over one night as the title suggests with the various roles performing actions during the night or having special abilities during the day. During the day phase, the players debate who among them is a werewolf. The day phase ends with the players voting on who they think is the werewolf and the one with the most votes is eliminated. The Villager team wins if a werewolf is killed, the Werewolf team wins if they both survive, and the Tanner wins if he himself is killed.
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''VideoGame/TroubleInTerroristTown'', one of the built-in game modes for ''VideoGame/GarrysMod'', features a terrorist faction in which some members have turned on the cause and aim to kill everyone else. Traitors know who their teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and their interactions with other players, with the Detective role -- designed to help weed out traitors -- randomly assigned to a single player.

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''VideoGame/TroubleInTerroristTown'', one of the built-in game modes for ''VideoGame/GarrysMod'', features a terrorist faction in which some members have turned on the cause and aim to kill everyone else. Traitors know who their teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and their interactions with other players, with the Detective role -- designed to help weed out traitors -- randomly assigned to a single player.
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[[folder:Roleplay]]
* ''Roleplay/TheMurderverse'' is a SharedUniverse of games that mostly combine ''Mafia''-type gameplay with character-based roleplaying, though there are a few games that break from the formula slightly.[[note]]''Murder U'', for example, runs on ''Franchise/{{Danganronpa}}'' rules where anyone may kill at any time, while in ''Monster Smash'', the bloodthirsty monsters aren't an ''informed'' minority.[[/note]]
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* In ''VideoGame/TheElderScrollsIVOblivion'', players get the chance to [[InvokedTrope invoke]] this type of game in a [[ProfessionalKiller Dark Brotherhood]] quest. Someone hires the Brotherhood to kill five people, who are lured to a mansion under the assumption that there is a treasure hidden somewhere in the house and that they'll be competing against each other to find it. While it's perfectly possible for a player to simply walk in, kill everyone with their weapon of choice, and finish, the developers [[DevelopersForesight programmed dozens of variables]] if someone decides to go the Social Deduction route instead. The player can convince everyone that this trope is happening, form alliances with the victims, backstab them (in some cases literally!), and reveal the paranoia, FantasticRacism, and love triangles among the group, all while silently killing them one after another.

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* In ''VideoGame/TheElderScrollsIVOblivion'', players get ''VideoGame/WerewolvesOnline'', the chance to [[InvokedTrope invoke]] this type villagers must figure out which members of their group are the Werewolves, who win if they kill them all.
''VideoGame/TroubleInTerroristTown'', one of the built-in
game modes for ''VideoGame/GarrysMod'', features a terrorist faction in a [[ProfessionalKiller Dark Brotherhood]] quest. Someone hires which some members have turned on the Brotherhood to kill five people, who are lured to a mansion under the assumption that there is a treasure hidden somewhere in the house cause and that they'll be competing against each other aim to find it. While it's perfectly possible for a player to simply walk in, kill everyone with else. Traitors know who their weapon of choice, teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and finish, the developers [[DevelopersForesight programmed dozens of variables]] if someone decides to go the Social Deduction route instead. The player can convince everyone that this trope is happening, form alliances their interactions with other players, with the victims, backstab them (in some cases literally!), and reveal the paranoia, FantasticRacism, and love triangles among the group, all while silently killing them one after another. Detective role -- designed to help weed out traitors -- randomly assigned to a single player.
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* ''VideoGame/{{LostDimension}}'' tasks the protagonist with ascending a pillar while determining which member of his group is the traitor on each floor.
* ''VisualNovel/{{RagingLoop}}'' is about a village that must deduce who among them are monsters and execute them before they are all killed.

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* ''VideoGame/{{LostDimension}}'' ''VideoGame/{{Lost Dimension}}'' tasks the protagonist with ascending a pillar while determining which member of his group is the traitor on each floor.
* ''VisualNovel/{{RagingLoop}}'' ''VisualNovel/{{Raging Loop}}'' is about a village that must deduce who among them are monsters and execute them before they are all killed.
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* ''VideoGame/{{LostDimension}}'' tasks the protagonist with ascending a pillar while determining which member of his group is the traitor on each floor.
* ''VisualNovel/{{RagingLoop}}'' is about a village that must deduce who among them are monsters and execute them before they are all killed.
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Compare TheMole, as identifying the hidden traitor/s is usually one of the objectives of the game, and TenLittleMurderVictims. On the SlidingScaleOfCooperationVsCompetition, this genre falls under either "Treacherous Teammate" (when there is only one traitor player) or "Informed Minority vs. Uninformed Majority" (when there are more traitors and they cooperate with each other).

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Compare TheMole, as identifying the hidden traitor/s is usually one of the objectives of the game, TenLittleMurderVictims, and TenLittleMurderVictims.BlendingInStealthGameplay, which usually involves hiding from the AI. On the SlidingScaleOfCooperationVsCompetition, this genre falls under either "Treacherous Teammate" (when there is only one traitor player) or "Informed Minority vs. Uninformed Majority" (when there are more traitors and they cooperate with each other).
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Compare TheMole as realizing who the hidden traitor/s is usually one of the objectives of the game; and TenLittleMurderVictims. On the SlidingScaleOfCooperationVsCompetition, this genre falls under either "Treacherous Teammate" (when there is only one traitor player) or "Informed Minority vs. Uninformed Majority" (when there are more traitors and they cooperate with each other).

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Compare TheMole TheMole, as realizing who identifying the hidden traitor/s is usually one of the objectives of the game; game, and TenLittleMurderVictims. On the SlidingScaleOfCooperationVsCompetition, this genre falls under either "Treacherous Teammate" (when there is only one traitor player) or "Informed Minority vs. Uninformed Majority" (when there are more traitors and they cooperate with each other).
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* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have a set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans. The humans win if they successfully guess which players are aliens and [[ThrownOutTheAirlock jettison them]], while the aliens win if time runs out or they trick the humans into throwing one of their own out the airlock.

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* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have a set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans. The humans win if they successfully guess which players are aliens and [[ThrownOutTheAirlock jettison them]], while the aliens win if the humans run out of time runs out or vote attempts, or they trick the humans into throwing one of their own out the airlock.
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* In ''VisualNovel/HighSchoolStory'' Book 3 Chapter 15, a [[[BribingYourWayToVictory premium]] scene allows Jordan and their friends to have an afterparty for the prom where they play "Mafia." [[spoiler: Maria is the mafia.]]

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* In ''VisualNovel/HighSchoolStory'' Book 3 Chapter 15, a [[[BribingYourWayToVictory [[BribingYourWayToVictory premium]] scene allows Jordan and their friends to have an afterparty for the prom where they play "Mafia." [[spoiler: Maria is the mafia.]]
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* ''[[Series/TrappedGameShow Trapped!]]'' is a British kids TV game show in which, every round, the contestants are set a task, but a player is secretly nominated to be a saboteur who must try and stop them finishing the task without the others realising what they're doing. If the players complete the task, the saboteur is removed from the game, but if the players fail, they vote on who they think the saboteur was and the player with the most votes is eliminated instead.

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* ''[[Series/TrappedGameShow Trapped!]]'' is a British kids TV game show in which, every round, the contestants are set a task, but a player is secretly nominated to be a saboteur who must try and stop them from finishing the task without the others realising what they're doing. If the players complete the task, the saboteur is removed from the game, but if the players fail, they vote on who they think the saboteur was and the player with the most votes is eliminated instead.



* ''Franchise/{{Danganronpa}}'' is a single-player example. The games are divided into chapters, and each chapter one of the students will commit murder, forcing the rest of the characters to investigate and then take part in a Class Trial: If they get the murderer right, the murderer is executed, if they get them wrong, everyone ''but'' the murderer is killed off.

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* ''Franchise/{{Danganronpa}}'' is a single-player example. The games are divided into chapters, and in each chapter one of the students will commit murder, forcing the rest of the characters to investigate and then take part in a Class Trial: If they get the murderer right, the murderer is executed, if they get them wrong, everyone ''but'' the murderer is killed off.



* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans. The humans win if they successfully guess which players are aliens and [[ThrownOutTheAirlock jettison them]], while the aliens win if time runs out or they trick the humans into throwing one of their own out the airlock.

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* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have a set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans. The humans win if they successfully guess which players are aliens and [[ThrownOutTheAirlock jettison them]], while the aliens win if time runs out or they trick the humans into throwing one of their own out the airlock.



* In ''VideoGame/SpaceStation13'', the different crewmembers must do their jobs and survive until they are evacuated. Each round gives you "Antagonists" which have an objective, usually related to sabotage, murder and destruction. In most modes they spawn directly from normal crewmen and it's the job of the security department and the rest of the crew to discover them. The hidden antagonist roles include "Traitors", which are normal crewman who secretly worked for TheSyndicate and have access to secret and deadly tools, "Changelings", shapeshiftings aliens who can absorb other people's identities, "Cultists", followers of a ReligionOfEvil trying to summon [[EldritchAbomination Nar'Sie]] by forcefully converting crewmembers, and "Revolutionaries", low-ranking employees who try to recruit from non-revolutionary crewmembers in order to overthrow the Captain and Heads of Department.

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* In ''VideoGame/SpaceStation13'', the different crewmembers must do their jobs and survive until they are evacuated. Each round gives you "Antagonists" which have an objective, usually related to sabotage, murder murder, and destruction. In most modes modes, they spawn directly from normal crewmen and it's the job of the security department and the rest of the crew to discover them. The hidden antagonist roles include "Traitors", which are normal crewman who secretly worked for TheSyndicate and have access to secret and deadly tools, "Changelings", shapeshiftings shape-shifting aliens who can absorb other people's identities, "Cultists", followers of a ReligionOfEvil trying to summon [[EldritchAbomination Nar'Sie]] by forcefully converting crewmembers, and "Revolutionaries", low-ranking employees who try to recruit from non-revolutionary crewmembers in order to overthrow the Captain and Heads of Department.



* ''VideoGame/TownOfSalem'' has three factions: the Townies (who must survive to the end of the game but don't know who the other townies are), the Mafia (who want to kill everyone and ''do'' know who their teammates are), and the neutral parties (who have their own individual win conditions). Townies and Mafias can only win if the other party all dies. Each day, the townspeople votes on who to lynch.

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* ''VideoGame/TownOfSalem'' has three factions: the Townies (who must survive to the end of the game but don't know who the other townies are), the Mafia (who want to kill everyone and ''do'' know who their teammates are), and the neutral parties (who have their own individual win conditions). Townies and Mafias can only win if the other party all dies. Each day, the townspeople votes vote on who to lynch.
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* ''Franchise/{{Danganronpa}}'' is a single-player example. The games are divided into chapters, and each chapter one of the students will commit murder, forcing the rest of the characters to investigate and then take part in a Class Trial: If they get the murderer right, the murderer is executed, if they get them wrong, everyone ''but'' the murderer is killed off.
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* In ''VisualNovel/HighSchoolStory'' Book 3 Chapter 15, a [[[BribingYourWayToVictory premium]] scene allows Jordan and their friends to have an afterparty for the prom where they play "Mafia." [[spoiler: Maria is the mafia.]]
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None


* The ''VideoGame/SecretNeighbor'' SpinOff of ''VideoGame/HelloNeighbor has players control one of a group of children attempting to rescue their friend from the basement. However, one of them is actually the Neighbor in disguise trying to pick off the children one by one.

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* The ''VideoGame/SecretNeighbor'' SpinOff of ''VideoGame/HelloNeighbor has players control one of a group of children attempting to rescue their friend from the basement. However, one of them is actually the Neighbor in disguise trying to pick off the children one by one.one before they can figure out which one is taking them out.
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* The ''VideoGame/SecretNeighbor'' SpinOff of ''VideoGame/HelloNeighbor has players control one of a group of children attempting to rescue their friend from the basement. However, one of them is actually the Neighbor in disguise trying to pick off the children one by one.
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* This occurred in the first episode of ''Series/WhoWantsToBeASuperhero.'' Ostensibly, people who'd created their own superhero identities were chosen as contestants for the show, including one bearded man named "Rotriart." After the group all met each other for a cocktail hour and headed for the manor where they'd be staying, this hero revealed that "[[SdrawkcabName Rotiart spelled backwards is 'TRAITOR!'"]], and that he'd been planted as TheMole to trick the group into exposing some less-than-ideal secrets, which in turn led to the first elimination ''before the game had technically begun.'' Needless to say, the other contestants immediately realized that they were in for a tougher challenge than expected.
** Other episodes of the show used similar tricks, with hired actors pretending to be various groups of people--such as some friendly waitstaff who asked questions about the heroes' secret identities or a bunch of adoring fans who tried to distract the contestants with requests for photos and autographs during a mission in an amusement park. It got to the point where ''any'' kind of social group had to be treated with suspicion.


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* In ''VideoGame/TheElderScrollsIVOblivion'', players get the chance to [[InvokedTrope invoke]] this type of game in a [[ProfessionalKiller Dark Brotherhood]] quest. Someone hires the Brotherhood to kill five people, who are lured to a mansion under the assumption that there is a treasure hidden somewhere in the house and that they'll be competing against each other to find it. While it's perfectly possible for a player to simply walk in, kill everyone with their weapon of choice, and finish, the developers [[DevelopersForesight programmed dozens of variables]] if someone decides to go the Social Deduction route instead. The player can convince everyone that this trope is happening, form alliances with the victims, backstab them (in some cases literally!), and reveal the paranoia, FantasticRacism, and love triangles among the group, all while silently killing them one after another.

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[[folder:Anime and Manga]]

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* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one "Impostor" among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor(s) win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.

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* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one "Impostor" among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor(s) win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks (including ghosts of dead crewmates) or eliminate all the impostors.
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"Traitor" implies they were on their side to begin with, but the impostors seem to be entirely different creatures. The paragraph was also inconsistent as to what the impostor was called.


* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one traitor among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor(s) win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.

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* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one traitor "Impostor" among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor(s) win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.

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* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one traitor among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor/s win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.

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* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one traitor among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor/s impostor(s) win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.



* ''VideoGame/TroubleInTerroristTown'', one of the built-in gamemodes for ''VideoGame/GarrysMod'', features a terrorist faction in which some members have turned on the cause and aim to kill everyone else. Traitors know who their teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and their interactions with other players, with the Detective role -- designed to help weed out traitors -- randomly assigned to a single player.
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* ''VideoGame/TroubleInTerroristTown'', one of the built-in gamemodes game modes for ''VideoGame/GarrysMod'', features a terrorist faction in which some members have turned on the cause and aim to kill everyone else. Traitors know who their teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and their interactions with other players, with the Detective role -- designed to help weed out traitors -- randomly assigned to a single player.
[[/folder]]
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* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans, but if they are found out they are jettisoned.

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* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans, but humans. The humans win if they successfully guess which players are found aliens and [[ThrownOutTheAirlock jettison them]], while the aliens win if time runs out or they are jettisoned.trick the humans into throwing one of their own out the airlock.
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A social deduction game's premise is simple: there are at least two teams with contrary goals. One of these teams is often smaller, villainous, hidden within the larger group, and working together to achieve some nefarious goal such as sabotage or [[KillEmAll killing the other players]]. The other players then have to figure out who the traitors are. This is often done through some WitchHunt-esque combination of questioning, catching them in the act, or [[VotedOffTheIsland voting them off]], while the traitors avoid suspicion by deflecting, bluffing, or [[BitchInSheepsClothing pretending to be innocent]].

''TabletopGame/{{Werewolf}}'' is the TropeCodifier and many games follow this template: there's a secret killer hidden within the group, and the rest have to figure out who it is before all TenLittleMurderVictims are offed [[DwindlingParty one by one]]. However, there are many ways to expand and complicate the Social Deduction Game, such as by adding more teams, roles, and various other mechanics, or by [[GenreMashup mixing it with other genres]]. Some games have this as an optional or random aspect of the larger gameplay.

Compare TheMole as realizing who the hidden traitor/s is usually one of the objectives of the game; and TenLittleMurderVictims. On the SlidingScaleOfCooperationVsCompetition, this genre falls under either "Treacherous Teammate" (when there is only one traitor player) or "Informed Minority vs. Uninformed Majority" (when there are more traitors and they cooperate with each other).
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[[folder:Anime and Manga]]
* The ''Future Arc'' in ''Anime/Danganronpa3TheEndOfHopesPeakHighSchool'' has the Future Foundation members forced to play an InUniverse [[DeadlyGame killing game]] where each member wears a wrist band with a 'forbidden action' that will trigger a lethal injection if the victim does it. The band also forces everyone to sleep at specific intervals while an attacker is given enough time to kill one person, so the players must either root out the traitor or die. [[spoiler:It's subverted since there is no attacker, one person is always left awake every interval and forced to kill themselves by watching a brainwashing video]].
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[[folder:Live-Action TV]]
* ''[[Series/TrappedGameShow Trapped!]]'' is a British kids TV game show in which, every round, the contestants are set a task, but a player is secretly nominated to be a saboteur who must try and stop them finishing the task without the others realising what they're doing. If the players complete the task, the saboteur is removed from the game, but if the players fail, they vote on who they think the saboteur was and the player with the most votes is eliminated instead.
* ''Series/TheMole'' is a spy-themed reality-tv show where the contestants work together to complete various tasks to earn a cash prize that only one of them will win. One of the contestants, however, is TheMole, a double agent hired by the producers themselves to sabotage the group's missions and keep money from the pot. The winner is the player who survived all elimination rounds and figures out who The Mole is.
[[/folder]]

[[folder:Tabletop Games]]
* The licensed board game based on ''Series/BattlestarGalactica2003'' varies the formula by having players draw a second set of loyalties halfway through the game, with the effect that a previously "human" player can be activated as a cylon SleeperAgent.
* ''TabletopGame/DeadOfWinter'' is a ZombieApocalypse survival horror board game, where players work together to gather supplies, resolve crises and protect their colony from zombies. However each player also has a special victory condition, unique to them, and some of these can require them working to sabotage the colony without the other players realising they're a traitor.
* ''TabletopGame/DeceptionMurderInHongKong'' has a variant of the ''Werewolf'' premise: players can be a Murderer, an Accomplice, a Forensic Scientist, a Witness, or an Investigator. The Forensic Scientist knows who the Murderer is and must leave 'evidence' pointing the rest of the players to the Murderer, who can evade or mislead with the help of the Accomplice.
* Task Force Games's ''TabletopGame/{{Intruder}}'', which was based on the film ''Film/{{Alien}}''. Nexus magazine #7 has an article called "Space Zombies" which presents a two-player variant for ''Intruder''. Before the game starts, the Intruder takes over the minds of two of the human crewmen (called "Zombies") and the Intruder player can take control of them from the human player during the game. If the human player can discover which of his crewmen are Zombies, he can kill them. If a Zombie Engineer constructs a weapon, it will automatically malfunction, revealing to the human player that the Engineer is a Zombie. If the human player tries to have a Zombie attack the Intruder, the Intruder player tells him that the crewman won't do it.
* ''TabletopGame/TheResistance'' and its Myth/KingArthur version ''Avalon''. There are spies (informed minority) within a greater group of government agents (uninformed majority); the latter only knows how many spies there are and not who is one. Players go on 'missions' that must be approved by the group; during the mission, 'good' members turn in Mission Success cards while spies can sabotage the mission by turning in a Mission Fail card (at the risk of their identity being exposed). The game continues in this manner until one team gets three points.
* ''TabletopGame/SecretHitler'': Among the players, most are Liberals, some are secretly Fascists, and one Fascist is Hitler. The Fascists know who each other are and must covertly pass fascist policies (done through a "President" and an elected "Chancellor" who choose from randomly-drawn liberal/fascist cards) without the liberals suspecting who they are. The liberals win if five of their policies are enacted; fascists win with six, but they can also win if Hitler is elected Chancellor past a certain point.
* ''TabletopGame/ShadowsOverCamelot'' is primarily a cooperative game, but there's a chance (proportionate to the number of players) that one player is a traitor trying to destroy Camelot. The loyal knights don't need to expose the traitor to win, but their final score is reduced by two points if they fail to, which can mean a last-minute defeat.
* ''TabletopGame/{{Werewolf}}'' and its predecessor ''Mafia'' are the TropeCodifier. Players are assigned various 'civilian' roles (some of whom have special abilities) and there's at least one killer, who offs one villager during the night each round. During the day the rest have to figure out who it is, and can choose to execute someone they suspect is the werewolf (although the werewolf/mafioso can misdirect them as well). The werewolf/mafioso wins if he kills all (or all but a couple) of villagers; the civilians win if they successfully identify the killer.
* ''TabletopGame/TheWerewolvesOfMillersHollow'' is a more complex version of ''TabletopGame/{{Werewolf}}'', with more roles and cards. The premise is still a Social Deduction Game, however, as villagers have to root out the werewolf who is killing them by voting on who they think it is.
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[[folder:Video Games]]
* ''VideoGame/AmongUs'' features a bunch of AmbiguouslyHuman creatures scurrying around a spaceship/research station/space station, with at least one traitor among them. The crewmates run around the maps and do maintenance tasks, while the impostor blends among them and tries to sabotage the facility and kill them all without anyone noticing or suspecting them during team meetings. The impostor/s win if crewmates no longer outnumber them; the crewmates win if they finish all their tasks or eliminate all the impostors.
* ''VideoGame/{{Barotrauma}}'' is about a crew trying to survive in a submarine at the bottom of the ocean. The game has a 'traitor' mechanic that can be enabled; traitors then have to sabotage the submarine with the others being none the wiser.
* ''VideoGame/{{Deceit}}'''s hidden faction is the Infected, who have TheVirus and whose goal is to convert or kill the other players, who must survive in this desolate area by picking up supplies. At night the Infected can turn into monsters and pick off the others. Innocent players can deal with suspected Infected by shooting them during the day, but they must still convince the rest of the players during the succeeding vote.
* ''Push the Button'' in ''VideoGame/TheJackboxPartyPack 6'' is a sci-fi themed game set on a space shuttle. Players have set amount of time to deduce who among them are aliens in disguise through a series of tests. Aliens are given different prompts during these tests, so they must attempt to blend in with the humans, but if they are found out they are jettisoned.
* In ''VideoGame/SpaceStation13'', the different crewmembers must do their jobs and survive until they are evacuated. Each round gives you "Antagonists" which have an objective, usually related to sabotage, murder and destruction. In most modes they spawn directly from normal crewmen and it's the job of the security department and the rest of the crew to discover them. The hidden antagonist roles include "Traitors", which are normal crewman who secretly worked for TheSyndicate and have access to secret and deadly tools, "Changelings", shapeshiftings aliens who can absorb other people's identities, "Cultists", followers of a ReligionOfEvil trying to summon [[EldritchAbomination Nar'Sie]] by forcefully converting crewmembers, and "Revolutionaries", low-ranking employees who try to recruit from non-revolutionary crewmembers in order to overthrow the Captain and Heads of Department.
* ''VideoGame/ThroneOfLies'' mixes the social deduction game with medieval politics. There are three factions; the 'good' one is the Blue Dragons, who aim to keep the peace in the kingdom and must root out the Unseen criminals and the Cult of Mithras. There are various roles, and the 'sniff out the traitors' aspect is complicated with how the roles' allegiances can change at any time.
* ''VideoGame/TownOfSalem'' has three factions: the Townies (who must survive to the end of the game but don't know who the other townies are), the Mafia (who want to kill everyone and ''do'' know who their teammates are), and the neutral parties (who have their own individual win conditions). Townies and Mafias can only win if the other party all dies. Each day, the townspeople votes on who to lynch.
* ''VideoGame/TroubleInTerroristTown'', one of the built-in gamemodes for ''VideoGame/GarrysMod'', features a terrorist faction in which some members have turned on the cause and aim to kill everyone else. Traitors know who their teammates are, but the terrorist cell at large does not. Meanwhile, innocent players must piece together who the traitors are from corpses left behind and their interactions with other players, with the Detective role -- designed to help weed out traitors -- randomly assigned to a single player.
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