# Werewolf (social deduction game)

(Redirected from Mafia (game))
Other name(s) Players making accusations in a game of Mafia Mafia Dmitry Davidoff At least 6 for classic[1] < 6 minutes 15–60 minutes Strategic thought, team play, social skills, roleplay

Werewolf, also known as Mafia, is a social deduction game created by Dmitry Davidoff in 1986[2] modelling a conflict between two groups: an informed minority (the evils), and an uninformed majority (the villagers). At the start of the game, each player is secretly assigned a role affiliated with one of these teams. The game has two alternating phases: first, a night role, during which those with night killing powers may covertly kill other players, and second, a day role, in which surviving players debate the identities of players and vote to eliminate a suspect. The game continues until a faction achieves its win condition; for village, this usually means eliminating all evils, while for evils, this usually means reaching numerical parity with the village and eliminating any rival evil groups.

## History

Dmitry Davidoff (Russian: Дми́трий Давы́дов, Dmitry Davydov) is generally acknowledged as the game's creator. He dates the first game to spring 1987 at the Psychology Department of Moscow State University, spreading to classrooms, dorms, and summer camps of Moscow University.[3][Note 1] Wired attributes the creation to Davidoff but dates the first game to 1987,[4] with 1986 being the year in which Davidoff was starting the work which would produce Mafia. He developed the game to combine psychology research with his duties teaching high school students.[4] The game became popular in other Soviet colleges and schools and in the 1990s it began to be played in other parts of Europe and then the United States. By the mid 1990s a version of the game became a Latvian television series (with a parliamentary setting, and played by Latvian celebrities).[5]

Andrew Plotkin gave the rules a werewolf theme in 1997,[6] arguing that the mafia were not that big of a cultural reference, and that the werewolf concept fit the idea of a hidden enemy who looked normal during the daytime.[4] Mafia and a variant called Thing[Note 2] have been played at science fiction writers' workshops since 1998,[7] and have become an integral part of the annual Clarion[8] and Viable Paradise[9] workshops. The Werewolf variant of Mafia became widespread at major tech events, including the Game Developers Conference, ETech, Foo Camps, and South By Southwest.[4] In 1998 the Kaliningrad Higher school of the Internal Affairs Ministry published the methodical textbook Nonverbal communications. Developing role-playing games 'Mafia' and 'Murderer' for a course on Visual psychodiagnostics, to teach various methods of reading body language and nonverbal signals.[10] In September 1998 Mafia was introduced to the Graduate College at Princeton University, where a number of variants were developed.[11] The werewolf theme was also incorporated in the French adaption of Mafia, The Werewolves of Millers Hollow.

In August 2000, a user under the alias "mithrandir" of The Grey Labyrinth, a website devoted to puzzles and puzzle solving, ran a game of mafia adapted for play on a forum board.[12] Both The Grey Labyrinth[13] and sister site MafiaScum[14] claim that this was the first game of mafia run on a forum board. From there, Mafia has spread to numerous online communities.

In March 2006 Ernest Fedorov was running a Mafia Club in Kiev, using his own patented variation of the rules. The club organizes games, rates players, and awards prizes (including a Sicily trip for their tournament-series champion).[15]

In June 2006 a Rockingham school inquiry was launched after parents complained of the traumatic effects classroom Mafia was having on their fifth-grade children. Davidoff responded to the reports, saying that as a parent who had studied child psychology for 25 years, he felt that the game could "teach kids to distinguish right from wrong", and that the positive message of being honest could overcome the negative effects of an "evil narrator" moderating the game as if it were a scary story.[16]

Mafia was called one of the 50 most historically and culturally significant games published since 1890 according to about.com.[17]

## Gameplay

Cards for the Werewolf version of Mafia are held by the dealer at the beginning of the game.

In its simplest form, Werewolf is played by two teams: the werewolves and the villagers. Live games require a moderator who does not participate as a player, and identities are assigned by handing out cards. At the start of the game, every werewolf is given the identities of their teammates, whereas the innocents only receive the number of werewolves in the game, and do not know which players are werewolves and which are villagers.

In an open setup, the numbers of each power role (e.g. militia) present in the game is known to the players, while in a closed setup, this information is not revealed, and in a semi-open setup, only limited or tentative information about the power roles is revealed. Thus, in an open or semi-open setup, if it is revealed that no militia are present in the game, it will not be possible for a werewolf to plausibly claim a militia role.

There are two phases: night and day. At night, certain players secretly perform special actions; during day, players discuss and vote to "lynch", or eliminate, one player. These phases alternate with each other until all werewolves have been eliminated or they reach numerical parity with the innocents.

Some players may be given roles with special abilities. Common special roles include:

• seer — a villager who may learn the team of one player every night;
• protector — a villager who may protect a player from being killed every night, but can only do so once in each game;
• masons — village-aligned players who can recognize each other

Andrew Plotkin recommends having exactly two mafiosi,[3] whereas the original Davidoff rules suggest a third of the players (rounding to the nearest whole number) be mafiosi. Davidoff's original game does not include roles with special abilities.[1] In his rules for "Werewolf", Plotkin recommends that the first phase be night and that there be an odd number of players (including the moderator). These specifications avoid tie votes for lynchings and ensure that the game will end dramatically on a lynching rather than anticlimactically with murder as a foregone conclusion.[3]

### Night

All players close their eyes. The moderator then instructs all werewolves to open their eyes and acknowledge their accomplices. The werewolves pick a "victim" by silently gesturing to indicate their target and to show unanimity then close their eyes again.

A similar process occurs for other roles with nightly actions. In the case of the seer, the moderator may indicate the target's innocence or guilt by using gestures such as nodding or head shaking.

Werewolves discussing whom to kill during the night

Night may be accompanied by players tapping gently to mask sounds made by gesturing.[18]

### Day

During the "day" phase, players vote on who to lynch

The moderator instructs players to open their eyes and announces who "died" the previous night. Discussion ensues among the living players. At any point, a player may accuse someone of being a werewolf and prompt others to vote to lynch them. If over half of the players do so, the accused person is eliminated and night begins. Otherwise, the phase continues until a lynching occurs.[3]

According to some rules, the role of dead players are revealed; according to others, it is not.[6][18] In both cases, dead players are not permitted to attempt to influence the remainder of the game.

Because players have more freedom to deliberate, days tend to be longer than nights.

## Game theory

### Mathematical study

Mafia is a complicated game to model, so most analyses of optimal play have assumed both (a) that there are only townsfolk and mafiosi and (b) that the townsfolk never have a probability of identifying the Mafia that is better than chance. Early treatment of the game concentrated on simulation,[19] while more recent studies have tried to derive closed-form equilibrium solutions for perfect play.

In 2006, the computer scientists Braverman, Etesami and Mossel proved that without detectives and with perfect players the randomized strategy is optimal for both citizens and mafia. When there is a large enough number of players to give both groups similar probability of winning, they showed that the initial number of mafiosi m needs to be proportional to the square root of the total number of players P, that is ${\displaystyle {\textstyle m\propto {\sqrt {P}}}}$.[20] With a simulation, they confirmed that 50 mafiosi would have almost a 50% chance to win among 10,000. The Mafia's chance of victory is

W(m, P)m/P,

which is a good approximation when the right hand side is below 40%. If any detectives are added to the game, Braverman et al. proved that the number of mafiosi must remain at a fixed proportion of the total number of players for their chance of winning to remain constant.[Note 3]

In 2008, Erlin Yao derived specific analytical bounds for the mafia's win probability when there are no detectives.[21]

In a paper[22] from 2010, exact formula for the probability that the mafia wins was found. Moreover, it was shown that the parity of the initial number of players plays an important role. In particular, when the number of mafiosi is fixed and an odd player is added to the game (and ties are resolved by coin flips), the mafia-winning chance do not drop but rise by a factor of approx. ${\displaystyle {\sqrt {\pi /2}}}$ (equality in the limit of the infinite number of players).

### Results in live play

In live (or videoconference[23]) real-time play, the innocents typically win more often than game theory suggests. Several reasons for this have been advanced:

• The physiological stress of sustained lying degrades the initial ability of mafioso to deceive the innocents, much more than a model of perfect play would predict, especially if the innocents can get the town emotionally involved in the game's outcome:

If you're trying to feign shock or anger, it's much harder to do over a long period. People accused of something they're trying to hide will start out feigning outrage – 'How dare you ask me that?' But that will start to change to objection rather than shock, as it's psychologically very difficult to mimic emotion.

— Dr Simon Moore, Wired UK[4]
• The information revealed by the mafiosi voting patterns tells against them later in the game. One of the game's fans Max Ventilla, has said that "If the villagers are allowed to keep a pencil and paper, they always win."[24]
• As players get more experienced, their strategic sophistication and ability to spot and use deception increases.[25] They will typically get better at the skills needed for playing innocents faster, being villagers more often than mafiosi.
• The Metagame aspect: Dimma Davidoff has said past connections will always lose to future collaborations.[4] When playing several Mafia games with the same people, it's more helpful to be known for honesty than for deceit. Davidoff considers that so important that he thinks the advantages of playing the mafioso role honestly, outweigh the disadvantages.

But, the Mafia can win in live play; their best chance of winning occurs when mafioso bond with their innocent neighbours and convince those neighbours to value that bond over dispassionate analysis.[24][26] The game designers Salen and Zimmerman have written that the deep emergent social game play in Mafia (combined with the fear of elimination) create ideal conditions for this.[27]

## Optional roles

These additional roles are named differently in the many versions of Mafia, for thematic flavor, or historical reasons. Also, the same role-name can have differing functions across different versions of the game.[28] What follows is a general list of role types found in Mafia variants; since the specific names vary by milieu it must be non-exhaustive.

### Investigative roles

Players with these roles use their own night-phase to discover something about other players. Though the standard game now includes the basic Detective, these roles are optional, and games can exclude them entirely (such as the stool pigeon variant, or Davidoff's original rules).

#### Investigative roles (standard)

• Detective, Seer, Commandant,[29] Sheriff,[30] etc.
Allied with the Innocents, the Detective can detect whether a player is a mafioso. They will typically wake up, and point at one person; the Narrator will silently indicate to the Detective whether that player is Mafia or Innocent. In some versions of the game, the Detective's investigation result is announced publicly by the Narrator, for example the Detective found a Mafioso!. More commonly, no announcement is made. As with other roles, which player is the detective is not generally known, leaving anyone the option of pretending to be the Detective.
A Detective is usually included in modern games. For example, somebody is always assigned this role in all commercial card game versions,[Note 4] and almost all internet-based, and most face-to-face games start with at least one detective.[Note 5] Multiple detectives either act in separate night phases (unaware of the identities of other detectives)[31] or work together as the police (an association role).

#### Investigative roles (less common)

• Psychic, Wizard, Fortune Teller, Oracle, Tracker, Watcher, etc.
Psychic, Psychologist, or Sorcerer-type investigators can determine other players' roles, rather than their alignments.[28] Roles which detect other roles are usually implemented in the same way as the Detective's ability to determine alignment. For example: the Psychologist points to a player (at night) for a Thumbs-up from the moderator if the Vigilante is pointed to.[Note 6] A Tracker may see what someone's night action was, or the target of their action, while a Watcher may see all those who visited someone at night.
Information revealed to investigators is fallible (in more complicated variants). Online versions can give information with a confidence level, and in other variants the Narrator deceives the Detective by showing all players as Innocent, all as Guilty, giving reversed results, or random information (these can be termed as Naive,[32] Paranoid, Insane, or Random respectively). Additionally, some Alignment roles give immunity to successful investigation.[Note 7]
In some games, there are Mafia Detectives, who have the power of a normal detective but are on the Mafia side. The Super Commandant has the standard power of a Detective, while also protecting the investigated from night-time attack.

### Omniscient roles

• Witness, Child, Little Girl, etc.
Instead of having to investigate, some innocent roles give complete information on the entire mafia: The witness is told who the mafia are during the first night, while the mafia are not told the witness's identity (differing from the stool pigeon in not being a part of the mafia).
The Little Girl in Werewolf and Werewolves of Miller's Hollow is allowed to secretly peek and watch as the werewolves choose their victim; if discovered doing so by the Werewolves, she dies of fright.[Note 8]

### Protective roles

• Guardian Angel, Doctor, Bodyguard, Hero, Jailer, etc.
Allied with the Innocents, the Doctor-type role defends others at night.[Note 9] Typically, they will awaken at night after the Mafia have gone back to sleep and point at one person to protect; that person will survive any night-time attack.[Note 10] They are typically allowed to protect themselves, and are commonly barred from protecting the same target on successive nights.[33] A Guardian Angel can only protect others. The Nurse gains the Doctor's abilities if the Doctor dies.[Note 11] The Jailer protects innocents just like the doctor, but also simultaneously blocks their night action. The Firefighter,[34] or the Herbalist can protect from some night-time attacks but not others (in Werewolf, for example, they choose one person to protect with wolfsbane, but that person may still be killed by the Serial Killer). Other games limit this ability to a certain number of times.[Note 12]

### Killing roles

• Vigilante, Veteran, Hunter, Bomb, Woodcutter, etc.
Aside from Mafia, Werewolves, and Serial Killers (solitary guilty parties), the Innocents may have some roles with the ability to kill at night. The Vigilante is an innocent who kills every night, in their own night-time phase,[Note 13] in some variations, having a limited bullet supply for the entire game. Some variations introduce a time limit of two nights before the player in the Killing Role can exercise their right to kill again or the trait that if they kill an innocent they either lose the ability to kill or die from guilt the next night. In the case of the Veteran, they may use their ability (a finite number of times, usually 3) in which anyone who targets them (friend or foe) will be killed. The Bomb may only trigger if targeted at night (not necessarily for death) by another role. Variants exist where this person can kill during the daytime cycle (e.g., the Terrorist / Gravedigger), sometimes only if executed during the daytime. The Woodcutter or Hunter can take one other person with them whenever they die.[Note 14]

### Alignment roles

• Miller, Godfather, Alpha Wolf, Wildcard, etc.
Some roles can fool investigations to determine their alignments: the Miller is an Innocent who appears guilty (usually because they are an outsider); the Godfather, on the other hand, appears innocent despite being the Mafia leader.[Note 15] The Alpha Wolf or Master Werewolf have the same role as the Godfather in Werewolf settings.

### Double-agent roles

• Traitor, Possessed, Undercover Cop, Godfather, etc.
The Traitor is not a mafioso (in that he does not awake at night and is not revealed as a mafioso by Detective type roles), but works to protect them and hamper the town during the day cycle, and wins only with a Mafia victory.[35] Conversely, the Undercover Cop is a mole within the Mafia group who acts with the Mafia but wins with the innocents. The stool pigeon may be the only optional role in play,[36] and makes up one of the few modern game forms to be played without an investigative role.
Distinct from the alignment-role Godfather, the double-agent Godfather behaves as a standard mafioso, but wakes again (after the Mafia sleep) to perform an extra kill. This Godfather-role wins only if he survives.

### Role manipulators

• Role-blocker, Bus Driver, Thief, Barman, Witch, etc.
These roles can stop or alter the night actions of others; for instance, they may prevent a protection or investigation from occurring, or they may change the target.[37] The Role-blocker can block the Vigilante for a night, while the Thief, Prostitute or Hypnotizer might be able to disable the powers of any selected target.[Note 16]
When the thief is used in Werewolves, an additional townsfolk card is added before dealing, and the Thief may choose on the first night to steal the role of another player or to take the unused role card. The player whose role was stolen gets the unused role card and the Thief card is discarded.

### Recruitment roles

• Godfather, Psychiatrist, Piper, Cult Leader, etc.
The Mafia Godfather may be able to recruit innocent players into their faction under certain circumstances. The Yakuza is a regular mafia player with an extra power: they may sacrifice themselves from the second night (during the night) and choose an innocent to join the mafia.[Note 17]
Each night, the scientist selects a player to cure; if a mafioso is cured, they awaken as an innocent.[38] The Psychiatrist is an innocent with the ability to convert the Serial Killer into a normal innocent.[39]
Cult Leaders recruit followers at night instead of kill; they act as an independent faction, usually with the ability to talk at night. The Piper wins by charming every surviving player; she charms players at night, who then know each other (but not the piper) but are otherwise unaffected.[33]

### Association roles

• Freemasons (Masons), Siblings, Lovers, Police, etc.
Possessors of these roles know one another and what their roles are.[40] On the innocent's side, a Mason usually has no special abilities, but knows the identity of all other Masons and that all Masons are also innocent.[41] Every member of the detectives or the police knows all the rest, because they collaborate at night to investigate someone (sharing the powers of the Detective role between them).[42]
Sibling pairs typically consist of one Mafia and one Innocent; in most versions, if one is killed, the other also dies.[43]Cupid in Werewolf chooses a pair of Lovers on the first night.[44] In this variant, the Lovers can also win the game (regardless of whether they are Mafia, Innocents, or both) by being the last two standing. Like Siblings, however, if one of the pair dies, the other dies as well.

### Election roles

• Doublevoter, Priest, Rabble Rouser, Lawyer, etc.
Until the Rabble Rouser dies there are two lynchings per day.[33]
In some games there are players who can change the vote count. Some players have 2 votes (Doublevoter); some players can only cast the final vote to kill a player (Actor); cannot vote to lynch (Voteless Innocent);[45] must delegate someone else to vote for them (Fool),[46] or require one fewer vote to lynch (Hated Innocent). The Priest cannot place the final vote (this role is not necessarily the same as the Reanimation-role priest). The lawyer selects someone during the night, and if that person tops the lynching vote the next day, saves them (a different lawyer role releases the wills written by players killed up to that point, when she dies).[46]

#### Public roles

• Mayor, Judge, Sheriff, President, etc.
This role is taken in addition to the assigned role, and it endows the player with additional, overt, powers (particularly during the daytime). Empowerment can be random, but is usually made by vote. For instance, the Mayor or Sheriff can be elected each morning, and gain two lynching votes,[47] or a Judge could moderate discussion in parliamentary fashion (to the advantage of their team). The elected President has the sole lynching vote.[48]

In Town of Salem, a version of Mafia, the Sheriff is a role which can interrogate people at night, and get to know their role. The Godfather and the Arsonist are immune to the detection of a Sheriff, and the Framer can frame a player to make them appear as a mafioso.

### Handicapped roles

• Murr, Drunk, Village Idiot, Teenage Werewolf, etc.
This may be a secondary role, taken in addition to the assigned role. However, it has the opposite effect, giving the bearer a handicap, like speaking only gibberish in the case of the Village Drunk, etc.
Alternatively, it may be a standard role with a particular constraint, such as the teenage werewolf, who must say the word werewolf at least once each day.[49]

### Handicapper roles

• Silencer, Dentist, Prostitute, Fog, etc.
The Dentist may select any other player at night, and prevent them speaking during the following day.[33] The Silencer is a mafioso with the identical power, except that they may not silence the same player on successive days. The silenced individual wakes in the morning and is immediately instructed not to talk until the end of the day. They can still raise their hand to vote in live games (although, if they were silenced by a prostitute, they are not allowed to vote).[50]

### Post-mortem roles

• Dark Background, Priest, Medium, Coroner, etc.
The dark background roles are standard (mafia or innocent) except for revealing a deceptive alignment when killed. The M.E. gathers information from the killings that can help the innocents, while the Priest learns about the alignment of the dead in the same way that the Detective learns about the living.[51] The Medium can interrogate dead players.[Note 18] While the coroner survives, the narrator will explain the means of death in all night kills.[38]

### Reanimation roles

• Reviver, Governor, Martyr, Witch, etc.
Revivers and Master Revivers are able to resurrect dead players, Master Revivers can bring the revived into their association (e.g., the Masons: see Association roles). The players resurrected by a Necromancer are converted to the Necromancer's alignment; those revived by the voodooist join a separate zombie group.[38] The Governor can reprieve those killed during the daytime, as can the Martyr if he sacrifices himself. The Witch has a (single-use) revival potion. At night, she's shown who will die in the morning, and can choose to save them.[Note 19]

### Rule-immune Roles

• Bulletproof, Oracle, Elder, etc.
The Bulletproof innocent is invulnerable at night,[Note 20] though usually with limits; for example, the Elder will survive the first night attack, but not the second.[33]
The Oracle has an investigative role similar to a Seer but also has the power to talk when inactive (talking in a sleep phase is usually a rule infraction).

### Special roles

• Baker, Chef, Village Idiot, Cobbler, etc.
The baker is on the side of the innocents. During the night, the baker gives one player a loaf of bread, potentially revealing their identity. If the baker dies, the innocents have just three nights to dispose of the mafia, or the innocents starve, and the mafia win. The Cobbler,[33] Village Idiot, or Jester has the objective of convincing the town to kill them, or is required to vote in favor of all proposed lynchings. Sometimes, successful lynching of the Village Idiot results in the mafia being able to kill two people that night.

### Complicated roles

Additional variations exist, sometimes with even more specialized or complicated abilities. There are many special roles, and many moderators design novel roles for each game. Some commercial variants ship with blank cards to allow this customization.[52] For example, neutral factions such as the serial killer could exist (the serial killer would have to kill everyone, innocent or mafia, to win).

## Variations

The naming of various roles, factions, and other elements of play is theme-dependent and has limitless variation. Common alternative themes restyle the mafia as werewolves, cultists, assassins, or witches, with other roles being renamed appropriately.

Over the years, players have created Mafia variants that include additional rules. Some of these are listed here.

### Variations on the win conditions

If there are as many mafiosi as innocents in the day-phase then a mafia victory is declared immediately, under the original Mafia rules. Other variants suspend this rule, and only declare the game after every member of one faction has been eliminated: this makes the game easier to explain, and to run.[53]

### Election variants

Nominees for lynching may be allowed to make a speech in their own defense. Usually, each player must vote, can only vote once and cannot vote for themselves. But some variants have a more complicated process of selecting players to be executed. Davidoff's original 'Mafia' allowed multiple day-time executions (per day), each needing only a plurality to action.[54]

Voting variants abound, but any lynching usually requires an absolute majority of the electorate, or votes cast. So the voting is usually not by secret ballot for multiple candidates with the highest vote count eliminated; it is more usual for the voting to be openly resolved either by:

• A nomination or series of elections structured to ultimately offer a choice between two candidates, or
• An option to lynch (or not lynch) one suspect (with a new suspect produced if the last one survives the vote).[53]

Deadlocked elections can be resolved by lot[20] or by killing the player with the scapegoat special role.[4]

The special case of one mafioso and one innocent remaining can be decided randomly[55] or be ruled a Mafia win—this is more usual in live play.[56]

#### Optional lynch variant

The Innocents can choose not to kill anybody during the day. Although commonly unsure of Mafia identities, the Innocents are more likely to randomly kill a mafioso than are the Mafia (at night). Therefore, not lynching anyone (even at random) will typically favor the Mafia.

However, when the number of survivors is even, No Kill may help the Innocents; for example, when three Innocents and one mafioso remain – generally called MYLO, or Mislynch and Lose due to the innocents' loss upon a lynch of their own[56] – voting for No Lynch gives a 1/3 chance of killing the mafioso the next day, rather than a 1/4 chance today (assuming random lynching).

### Mafia killing methods

Some variants require all Mafia members to choose the same victim independently for a kill to succeed. This can be achieved in the following ways:

• By waking the Mafia members up separately.[57]
• By calling out the names of all surviving players and requiring surviving mafiosi to raise their hands when the name of the victim is called out. In this variant, the mafiosi only "wake up" (open their eyes) at the very beginning of the game when they identify each other. This variant also allows other roles to take their actions by simply raising their hands when their target's name is called out.
• By having them write their kills. Under this variant, Innocent players write the word 'honest' on a piece of paper; Mafia members write the name of a player for elimination. If all the mafia notes have the same name on them, that player is considered killed by the Mafia.

In some online versions of the game, a particular player (the Godfather or a designated mafioso) must send in the kill.

Another variant requires the night-time vote to be secret and unanimous, but allows multiple players to be added to the execution queue to ensure unanimity.

### Multiple families

Multiple, independent groups of mafia or werewolves[58] act and win independently, giving faster game-play and the potential for cross-fire between the factions.

### Attributes

In this variant, players are given two cards: the first contains their role, the second an attribute. Attributes were originally derived from roles that could apply to both Mafia and Innocent alignments such as Bulletproof (cannot be killed at night), Mayor (has two votes in the lynch), and Siamese Twins (more commonly known as Siblings or Lovers).[59]

### Quantum Werewolf

This variant was developed by Steven Irrgang and used for a puzzle in the 2008 CISRA Puzzle Competition. The difference from a standard game of Mafia is that players are not initially assigned roles, but rather on each day are given the probabilities describing the game's current quantum state. Each player with a non-zero probability of being a seer or a werewolf performs the appropriate night actions (which may not be effective if it is later determined that the player did not have that role). When a player is killed, the wave function collapses and the players are given updated probabilities.[60]

### Train Mafia

Traditional Mafia re-envisioned and heavily modified by the Copenhagen Game Collective to be played in a subway metro. In this variation, players who are 'lynched' are kicked off the train (at the next stop), and must wait in shame for the following train – a kind of 'afterlife' train – to join a second, interwoven game.[61]

### Invisible City: Rebels vs. Spies

A location-based mobile gaming variant for Android, designed for city center play. The two factions are: the Rebels, the majority; and the Spies, the informed minority. The rule-set replaces expulsions with scoring by round. Each player is assigned an individual mission each round. Some missions are critical and if one of those fails, the round goes to the Spies, but only one player knows which missions are critical.[62]

### Ultimate Werewolf

In this version of Mafia, the main enemies are the werewolves, as opposed to the mafia. The werewolves wake at night to kill a player, who is usually a Villager. Other helpful roles such as the Seer, Bodyguard, and Witch exist to help purge the village of werewolves, but other neutral roles exist such as the Tanner, lovers (if Cupid is in the game and the lovers are from different teams), and a third major faction: Vampires.

#### One Night Variant

In this standalone game published by Bezier Games, players only "sleep" and close their eyes for a single night at the beginning of the game. They then have a single day of discussion, with a single lynching. No players are eliminated as the game progresses. There is no moderator, so everyone gets to participate as a member of the town or village. When playing this game, three more role cards are used than the number of players; when everyone is randomly dealt out their card the three extra ones placed in the middle of the table. To begin the game one of the players, with eyes closed, will act as the "caller" on the single starting night, going through the nighttime roles once: Werewolves and Minions (if in play) will identify each other, the Seer will examine one player's card or two of the middle cards, the Robber will steal another player's role card and replace it with their own, the Troublemaker will blindly swap two players' role cards, the Insomniac wakes up to check if their role card has been swapped, etc. The game ends on a single lynching vote, with the villagers winning if a single werewolf is caught, and the werewolves winning if no werewolves are killed. This game can be played with as few as three players. Play time can be as quick as five minutes per game[63]

### Town of Salem

Town of Salem is an advanced online version of Mafia that takes place during the Salem witch trials. It involves several different roles from multiple factions.[64] The game was updated on June 6, 2017, to add a new faction: the Coven, which mainly consists of witches and is similar in function and goal to the more traditional Mafia.[65]

## Online play

Online gameplay at Mark Kirschstein's werewolv.es server

Mafia can also be played online. Games can be played on IRC channels, where a bot assumes the role of a game moderator and the interaction of players is conducted via textual communication.[66] Being that IRC is not a widespread way of communication,[citation needed] these Mafia games are restricted to limited number of people. Since 2008, many other Mafia game sites were formed. These sites are attempts at reproducing the live Mafia games, and the duration and the mechanics of the games are about the same as when the game is played traditionally.

Playing mafia-like games online opens the possibility of long lasting games, such as the ones on forums. In such games, one day in real life usually corresponds to one day within the game, so players log in each morning to see who was killed during the night phase.

The online games have several advantages. There is no need to gather many people in the same room, so organizing and playing a game of Mafia is faster and more convenient. Removing the human moderator and the need for players to close their eyes removes the possibility of accidental revelation of information. Online play also allows role mechanics which would be too cumbersome to use in a physical version of the game.

A drawback of online play is the lack of direct face-to-face communication, which many consider the most important aspect of Mafia. Some sites organize Mafia games with web cams, so that face-to-face communication is preserved. The long lasting online mafia games that are usually played via online forums do not necessarily have this drawback. People who communicate via forums usually do not know each other in real life.

In a traditional Mafia game, all of the players are in one room. There is no way to communicate with another player in private. With online games, this is not the case. Many Mafia game forums and game sites have rules that mandate that only one channel of communication must be used for all game related discussion.[67] Thus forbidding the use of alternative channels for discussing the game. These rules are obviously only declarative as there is no way of enforcing them efficiently. It is especially difficult to enforce such rules during long games with players who communicate with each other in person in real life. All forums support different kind of game setups, so it is feasible to organize a forum game without the restrictions on private messaging.

A particular problem for these rules is trying to prevent "dead" players from participating in the game. Since, in general case, this breach of rules cannot be proven, the gameplay of most sites depends heavily on players' honesty and integrity.

## Artificial intelligence

Werewolf is a subject of artificial intelligence research due to its unique features such as persuasion and deception.[68] The game requires several AI technologies such as multi-agent coordination, intentional reading, and understanding of the theory of mind.[69]

Deep learning has been used in an attempt to develop agents that can win the game as werewolves or as villagers.[70] Regular expressions have been used to parse utterance logs for divulgence (or "coming-out" as a role) and decision information, although one difficulty has been that a statement such a "Player A is a werewolf" could be based on either the player's ability (e.g. as seer) or just speculation.[71]

## Notes

1. ^ Plotkin quotes a 2005 email in which Davidoff explains that he brought Mafia into the Psychology department classrooms for research and it spread (as a meme) from there to dormitories and likely over next summer, through student summer camps. He credits this game-based methodology to pioneering 1920s psychologist Lev Vygotskiy.
2. ^ In which the antagonists are Things, shape-shifting aliens that can turn humans into other Things. For the rules of the original variant, see: "Thing Werewolf Variant".. For a detailed description of another variant of this game, see: Solis, Daniel. "Alien Among Us".. For the most recent variant using web-enabled devices, see: "Latitude 90: The Origin".
3. ^ The single detective publishes a large list of innocents, and asks to be lynched to guarantee its veracity (under the standard rules in which the detective's role is revealed after she is killed, no strategic interference from the Mafia is possible): Braverman, M.; Etesami, O.; Mossel, E. (2008). "Mafia: A Theoretical Study of Players and Coalitions in a Partial Information Environment". Annals of Applied Probability. 18 (3): 12. arXiv:math/0609534. Bibcode:2006math......9534B. doi:10.1214/07-aap456.
4. ^ As of November 2007, five card-based versions of this game are sold, and all require one player to become a Seer. The "Do you worship Cthulhu Deck Setup". specifies that a Seer card be dealt to someone even with the (minimum) five players. Similarly, the Lupus in Tabula Preparation calls for the Seer card to be dealt to somebody even if the game is played with the minimum number of players (eight). Getting Started with Ultimate Werewolf Role Selection advises that even the introductory game should include the Seer (with further optional roles being added in addition to the seer in later games). Werewolves of Millers hollow uses the Fortune Teller name for the Detective but the role is identical to the standard seer/angel/detective, and is again mandatory, having its own phase of the night in the basic rules. (As does the Seer in Are You a Werewolf? – though it is after the werewolves' phase.)
5. ^ For example, "The Mafia rules (MIT)"., from Massachusetts Institute of Technology, are very simple, and specify roles for 7–20 players, always including at least one Detective. Andrew Plotkin's original Werewolf always includes a Villager (Seer), and he mentions that in 1997 Mafia was played in the National Puzzlers' League convention with a Knight Commandant. (The role of the Knight Commandant or Knight is described in detail as having the standard Detective powers in: "National Puzzlers' League – 1997 Convention Reports". Archived from the original on 2007-12-08. Retrieved 2007-11-24.) Plotkin describes Davidoff's original game (which had no Detective) as well off the current average. A rare modern rule-set with No Inspector is: Engstrom, Vegard (1999). "The Game Player Constellations". Retrieved 2010-06-15. but only when starting with five, larger groups get at least one inspector.
6. ^ For example, Vigilante in the "Princeton rules".
7. ^ For example, The Oracle in Werewolf chooses one person to investigate every night, and are shown their card, unless they pick the Master Werewolf – when the Oracle is shown an (innocent) villager card.
8. ^ For example, as described on Ultimate Werewolf's Little Girl Card, and in the first non-introductory role suggested by Wired: The Child spies at night when the werewolves are killing, and only when the werewolves are killing, by opening her eyes ever so slightly
9. ^ Depending on the variant, they may know the identities of the Mafia, but this isn't required; they usually indicate the player to protect in a separate phase of gameplay (a separate part of the night) than the Mafia's killing phase. The Mafia-Doctor is a mafioso, and a more obscure variant role, with the opposite power (from the Doctor) of protecting the guilty from attack during the day.
10. ^ The protected player gains complete invulnerability during the night they are visited by the Doctor or Bodyguard. The Mafia do not usually know the identity of the protected player, nor get a chance to select another victim, so this attack is wasted if the Mafia target a protected player (e.g., "Bodyguard, Lupus in Tabula". Archived from the original on 2005-12-24. Retrieved 2007-11-13.).
11. ^ For example, see the 2+2 rule-set describing the Nurse: "Mafia rules".
12. ^ For example, the Witch in Werewolves of Miller's Hollow has only one use of her protective potion. She is allowed to see who was killed by the werewolves before applying the protective potion, so this character is more typical of the reanimation than the protective type.
13. ^ "Do you worship Cthulu Roles and Quick Reference Script". Retrieved 2007-11-21.. This makes the vigilante as lethal as the entire Mafia, potentially overbalancing the game, which has led to the introduction of roles that limit his effectiveness, such as the Walrus role-blocker.
14. ^ The Hunter appears in Werewolves of Miller's Hollow, for example. The Woodcutter is a (less common) equivalent name for the role. Wired recommends including the hunter in even the most basic games: "Original Werewolf characters". January 2010. Retrieved 2010-06-13.
15. ^ The Godfather role is played differently between variants. If immunity to detection is the Godfather's only power, his leadership of the Mafia need only be nominal: "Name: Godfather". Archived from the original on 2007-02-27.
16. ^ The thief's action usually applies for a single night, as in: "Mafia Game: IRC Version". Archived from the original on 2007-12-15.. The thief sometimes has a purely investigative function – being only able to determine the roles from stolen items."Thief". Archived from the original on 2007-02-27.
17. ^ Bennet, J. "Mafia: Advanced rules" (PDF). Archived from the original (PDF) on 2011-08-10. In other variants, the mafia can't kill anyone else on the night this power is used. The potential existence of a Yakuza makes innocents with protective roles less inclined to reveal their roles for fear of being converted (or more inclined to reveal themselves if they expect the Mafia to win and wish to be converted).
18. ^ The Medium function varies, for example see summarized 'Medium-enabled seance' rules from Werewolf at: "boredgamegeeks". Retrieved 2007-11-14., as opposed to the Lupus in Tabula Medium, who alone can uncover the alignment of the deceased (see: "Lupus in Tabula (English rules) Special Characters".).
19. ^ The Witch was introduced as a special character in The Werewolves of Millers Hollow, where she also has a single-use killing potion. She may be able to revive herself with the "reanimation potion", see: Original Werewolf characters
20. ^ The bulletproof effect typically applies to night-time killings and is usually temporary, for example, the Ultimate Werewolf Amulet of Protection (bulletproof vest equivalent) protects over only a single night. Rare optional roles do give permanent protection from mafia attack, such as the Lupus in Tabula Werehamster Archived 2005-12-24 at the Wayback Machine

## References

1. ^ a b https://web.archive.org/web/19990302082118/http://members.theglobe.com/mafia_rules/
2. ^ François Haffner (1999-02-22). "Questions to Dimitry Davidoff about the creation of Mafia on the French website". Jeuxsoc.fr. Retrieved 2011-04-11.
3. ^ a b c d
4. Robertson, Margaret (2010-02-04). "Werewolf: How a parlour game became a tech phenomenon". Wired UK. Conde Nast Publications (3.10). Retrieved 2010-06-06.
5. ^ Danopoulos, C. P.; Zirker, D., eds. (December 1998). The Military and Society in the Former Eastern Bloc. Boulder: Westview Press. p. 175. ISBN 978-0-8133-3524-7. OCLC 237326581. The objective is to discover who these [Mafia] people are even as they speak on behalf of Latvia's welfare, and before they eliminate people who suspect who they are.
6. ^ a b "Werewolf A Mind Game". is Plotkin's own description of the original Werewolf version
7. ^ Kaufman, Jerry (2000-01-01). "Corflatch Progress Report #3". John Aegard is running another event, to take place Friday at 8 p.m. John says, Come play the game that's paralyzed two straight Clarions – MAFIA! Since the Clarion workshops take place during the summer, the game must have first been played at a Clarion workshop in 1998, most likely Clarion East – see David Levine's account of Clarion West 2000, "David Levine's Clarion Journal: Week 6". Mafia and Thing were first taught to the annual Viable Paradise workshop by James Patrick Kelly and Steven Gould in 2001; see Silverthorne, Lisa. "The VP Experience".
8. ^ See "Clarion, Day 33: She's mafia, I know she is!".; Wilson, Alex. "Clarion Week 6: Always Bet on Black (in Mafia)!".; Wilson, Alex. "Clarion_Mafia".
9. ^ See "Making Light: Home Again".; "Making Light: Traditional diversions".; Azure, Chris. "Viable Paradise – Day 1". Archived from the original on 2011-08-17.; Griffith, Eric. "A week in paradise".; and Gordon, Barbara. "Viable Paradise, day one".. Quoting Dvorin, Julia. "Viable Paradise: A Travelogue (Part 1)". After the introductions and instructions for the next day, I thought that perhaps we'd be released and I could go see the room I was to be staying in for the week and chill out a little from the travel. But such was not to be, for the agenda now turned to the important bonding activity of playing Mafia and Thing. So I pushed away the cranky traveler's whininess that was stalking me, and sat down in a circle with a bunch of strangers and began to accuse them of lying and murder. Also: Gould, Steven. "Photo: semi-mandatory Mafia".
10. ^ Петров С.В., Холопова Е.Н. «Невербальная коммуникация. Развивающие ролевые игры „Мафия「 и „Убийца「». Учебно-методическое пособие – Калининград: КВШ МВД России, 1998
11. ^ "The Graduate Mafia Brotherhood at Princeton University". Archived from the original on 2014-05-17.. Retrieved 2014-05-16.
12. ^ "Mafia!!". The Grey Labyrinth. mithrandir. 20 August 2000. Retrieved 21 July 2016.
13. ^ "Forum Index". The Grey Labyrinth. Retrieved 21 July 2016. The Internet's First Home of Mafia.
14. ^ "History of the game". MafiaScum. 31 January 2007. Retrieved 21 July 2016. mith had been visiting [The Grey Labyrinth] since 1996, and started posting in the forums soon after they started. mith had played face-to-face Mafia with his church youth group in the late 1990's, and one day decided it would run well on the forums. The original thread can still be found here.
15. ^ Berest, Pavlo (2006-03-08). "Intellectuals playing mafia games". Now the rules of the game are the intellectual property of Fedorov. The club has its own rules, see: "Club Империя Мафии".
16. ^ Davis, Aaron (2006-08-04). "School officials still investigating 'Mafia'". Seacoast Media Group. One parent, Nicole Hollenbeck told The Rockingham News in June, My child has had sleepless nights, crying before bed because she's afraid that she'll sleep walk and relive the tragic events they talked about in class [...] We teach our kids right from wrong, and this is what they are being taught?
17. ^ Arneson, Erik. "Board and Card Games Timeline".. About.com also includes Mafia in the Top 5 Best Voting Games. The reason it is significant is given: "Werewolf / Mafia". Archived from the original on 2007-11-03. Retrieved 2007-11-25. Werewolf is a favorite at game conventions and has been written about in several mainstream articles.
18. ^ a b "Are You A Werewolf? Rules of Play". Looney Labs. Retrieved 2010-06-15. Night-Noise: When everyone closes their eyes at night, it is best for people to also start humming, tapping the table, patting a knee, or making some noise. This will cover up any sounds made accidentally by the werewolves, the seer, or the moderator
19. ^ For example: Plotkin, A. "Werewolf Statistics". If we figure that 9 or 11 players is ideal for a two-wolf game, and we assume that these probabilities actually means anything (heh heh), then an ideal game has a human-win chance of 0.23 to 0.29. (Again, for completely stupid humans.)
20. ^ a b Braverman, M.; Etesami, O.; Mossel, E. (2008). "Mafia: A Theoretical Study of Players and Coalitions in a Partial Information Environment". Annals of Applied Probability. 18 (2): 825–846. arXiv:math/0609534. Bibcode:2006math......9534B. doi:10.1214/07-AAP456. Archived from the original on 2012-03-16.
21. ^ Derivation is by recursion on decreasing numbers of players in the following round, see: Yao, E. "A Theoretical Study of Mafia Games" (pdf). p. 7.
22. ^ Migdał, Piotr (2010). "A mathematical model of the Mafia game". arXiv:1009.1031 [math.PR].
23. ^ Batcheller, Archer L.; Hilligoss, Brian; Nam, Kevin; Rader, Emilee; Rey-Babarro, Marta; Zhou, Xiaomu (2007). "Testing the technology: playing games with video conferencing Conference on Human Factors in Computing Systems". Proceedings of the SIGCHI conference on Human factors in computing systems: 849. doi:10.1145/1240624.1240751. ISBN 978-1-59593-593-9.
24. ^ a b McCarthy, C (2009-04-24). "Why do young techies want to be werewolves?". CNET News.
25. ^ Cross, D. (June 2005). "Mafia Party EXTRA TIPS". Vice Magazine. Archived from the original on 2008-11-20.
26. ^ Gopnik, Adam (2006). Through the Children's Gate: A Home in New York. p. 245. ISBN 978-0-676-97827-8. the emotional authenticity of the alliances, the felt pleasure of trusting another, is startlingly, frighteningly real. You and George against the Mafia – but then the quick nightly shadow intrudes: What if George is the Mafia? Yet the proper suspicions, though they rise, rarely override these instant bonds.
27. ^ Salen, K; Zimmerman, E. (October 2003). Rules of play: game design fundamentals (illustrated ed.). MIT Press. pp. 468–469. ISBN 978-0-262-24045-1.
28. ^ a b For example, Bezier Games' Ultimate Werewolf Sorcerer has the ability to detect the Seer role. (The sorcerer is granted different powers in other rule-sets, like Princeton University's, in which the Wizard has the ability to detect the Seer.) Whatever name this role is known by, the Detective-detector is typically aligned with the Mafia (for example, see: "9 Player Werewolf Evil team". 2005.)
29. ^ Gopnik, Adam (2006). "Fourth Thanksgiving: Propensities". Through the Children's Gate: A Home in New York. pp. 242–253. ISBN 978-0-676-97827-8.
30. ^ "Mafia (con)". Archived from the original on 2007-11-18. Retrieved 2007-12-20. Knight Commandant / Sheriff – a townsperson who investigates mafia members
31. ^ Cross, D. (June 2005). "Mafia Party THE SETUP". Vice Magazine. Archived from the original on 2008-11-20.
32. ^ "Name: Naive Cop". Archived from the original on 2007-02-27. Retrieved 2007-12-16. Description: A type of cop that always gets innocent results regardless of who they investigate
33. "Characters from the New Moon expansion set". 2010. Retrieved 2010-06-13.
34. ^ "Various Mafia Roles: Third Party Roles: Arsonist & Firefighter". Archived from the original on 2007-02-20.
35. ^ A typical Traitor-type role is the Possessed Special Character from "The LUPUS IN TABULA (2nd edition) rules". Archived from the original on 2005-12-24.
36. ^ Fraade-Blanar, L. (2001-10-26). "Mafia game indulges fantasy, avoids jail term". The Johns Hopkins News-Letter. One person out of the circle finds themselves tapped twice, making them the stool pigeon. He must inform the townspeople, i.e. everyone who was not tapped, of the identity of the Mafia members while not being killed himself... The game shows a historical conflict between the accusers and the accused. It could well be the Europeans accusing witches
37. ^ The Witch for example has this ability in Bezier's game "Ultimate WereWolf"
38. ^ a b c "Characters". January 2010. Retrieved 2010-06-13.
39. ^ The Psychiatrist can 'cure' the Serial Killer according to the Pub Game rules: "Serial Killer".. When 'the psychiatrist' is in play, the Serial Killer may be The Psychopath, as in: "Name: Psychiatrist (Various Mafia Roles: Third Party at MafiaScum.net)". Archived from the original on 2007-02-27.
40. ^ For example, Ultimate Werewolf Masons recognize one another from the first night.
41. ^ Spadaccini, S. (September 2005). The Big Book of Rules. Plume. ISBN 978-0-452-28644-3.
42. ^ As in the Mafia Games setup described by group-games.com, requiring only mafiosi, police, a doctor, and the townspeople. Or, a simple version using only citizens, mafia, and detectives, as described in: Toone, M. (July 2009). Great Games!. MVT Games. p. 41. ISBN 978-0-9798345-5-4. The detectives now guess who they think might be one of the Mafia -no talking allowed, they simply point to one person.
43. ^ "Werewolf: Extra Materials". Wired Magazine. Retrieved 2010-06-13. Optional rule: if the Lovers die and Cupid is still alive, Cupid chooses a new set of lovers. Italic or bold markup not allowed in: |publisher= (help)
44. ^ The Cupid card in Bezier Game's Ultimate Werewolf, for example.
45. ^ Alternatively, they may have a vote, but be mandated to always vote against lynching, as is the Village Ethicist
46. ^ a b "Werewolf: Extra Materials". 2010-01-29.
47. ^ "Character references". 2010-01-29. Retrieved 2010-06-14.
48. ^ "Mafia variant: President". described by MafiaSpiel.de, for example.
49. ^ A role introduced in Ted Alspach's 2010 Ultimate Werewolf: Classic Movie Monsters.
50. ^ "Common Mafia Roles". Retrieved 2010-06-14. – The Silencer is typically aligned with them and knows their identities, but (in some variants) in unknown to them, not participating in mafia killings.
51. ^ The Priest alone knows whether the dead were innocent in the World Boardgaming Championships game described by Bruno Wolff in "Werewolf rules". Retrieved 2007-11-19.
52. ^ Lupus in Tabula (Werewolves at the Table) card listings
53. ^ a b Toone, M. (July 2009). Great Games!: 175 Games & Activities for Families, Groups & Children. MVT Games. p. 42. ISBN 978-0-9798345-5-4.
54. ^ "The Original Mafia Rules". 1999. Archived from the original on 1999-03-02. Retrieved 2010-06-15. Accusations may happen any number of times during the discussion...once in a while, someone should propose to have a Mafia Night. If the majority of the players who are still in the game agrees, the Night begins.
55. ^ The random resolution is typical in academic models of Mafia. For example, see: Yao, E. (2008). "A Theoretical Study of Mafia Games". arXiv:0804.0071.
56. ^ a b That a single mafioso wins against a single surviving innocent in the day phase is a standard live-play rule, being a sub-case of the rule that a numerical equality is a Mafia victory
57. ^ The 'separate waking' method of designating victims is used in the official "Mayday". Archived from the original on 2007-11-13. rules, for example. (This is a Soviet Union-themed variant with other expanded rules, released under Creative Commons licensing.)
58. ^ "Mafia and Werewolves". Note – This variant was performed with great success on November 12, 1998 – From the old Princeton variant rules.
59. ^ 7-0-7, Jon Bennett "Mafia Advanced Rules" (PDF). Archived from the original (PDF) on 2011-08-10. Additional rules created by Jon Bennett, accepted in local Mafia circles.
60. ^ "CISRA Puzzle Competition – Quantum Werewolf". Puzzle.cisra.com.au. 2008. Retrieved 2009-06-16.
61. ^ "Train Mafia". Copenhagen Game Collective. 2009-09-27. Retrieved 2011-04-11.
62. ^ "Invisible City: Rebels vs. Spies". Human-Computer Interaction Group, University of Patras, Greece. 2011. Archived from the original on 2012-06-27. Retrieved 2012-11-21.
63. ^ "One Night Ultimate Werewolf | Board Game | BoardGameGeek". Retrieved 25 February 2014.
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65. ^ "Indie Smash Hit Town of Salem Gets New Expansion: The Coven". www.gamasutra.com. Retrieved 2019-09-05.
66. ^ "MAFIA - XKCD Wiki". wiki.xkcd.com. Retrieved 2015-09-19.
67. ^ "Epicmafia - Lobby". epicmafia.com. Retrieved 2015-09-19.
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