Social Deduction Games: How They Work and What to Play

A few people at the table know a secret. Everyone else has to work out who they are, using nothing but conversation, and then vote. That's a social deduction game, and it's one of the oldest and most reliable formats for a party. Here's how these games work, where they came from, the main types, and which one to pick for your group.

The quick answer

A social deduction game, also called a hidden role game, gives a few players a secret role or secret information. They try to blend in. Everyone else asks, listens, argues and votes to find them.

Mafia and Werewolf: the classic. Secret roles, a night with eyes closed, a day with a vote. Best for 5 to 16 players.
Imposter and Odd One Out: everyone shares a secret word except one or two players. Rounds take a few minutes. For 3 to 12.
Find the Spy: everyone knows a secret location except the spy. For 3 to 12, best with 5 to 8.

New to the genre? Start with Imposter. Big group and 40 minutes? Play Mafia.

What is a social deduction game?

Every game in the genre is built from the same few pieces.

Hidden roles. At the start, each player privately learns their role. Most are on the "good" side. A few are on the other side: the Mafia, the werewolves, the spy, the imposter.

An informed minority and an uninformed majority. This is the core idea. The small group knows who they are, and often who their teammates are. The big group knows only its own roles. The minority has the information. The majority has the numbers and the vote.

Discussion. Nobody can check anyone's card, so the only evidence is what people say and how they say it. Who answered too fast? Who changed their story? Who keeps pushing the same vote?

Voting. At some point the group has to commit. Someone is voted out, the truth comes out, and the game goes on with one less suspect, or one less innocent player.

The surprising part is how much fun the lying is. These games give you permission. Everyone agreed to the rules, everyone knows someone is bluffing, and the lie belongs to your role, not to you. Looking your best friend in the eye and saying "I'm just a villager" is a small performance. Getting away with it, or getting caught by someone who reads you perfectly, is the whole point.

Where social deduction games come from

Mafia is credited to Dimitry Davidoff, who created it in 1986 while studying psychology at Moscow State University. It set an informed minority against an uninformed majority and spread through Soviet schools, dorms and summer camps, then reached the rest of Europe and the United States in the 1990s. Davidoff's first version had no special roles. The Detective, the Doctor and other night roles were added as the game spread.

In 1997, Andrew Plotkin, an interactive fiction writer, retold the game with werewolves hiding in a village. The rules stayed almost the same, but the theme stuck, and many groups know it as Werewolf today. For what actually differs between the two, see Mafia vs. Werewolf.

Since then the genre has grown into card games, word games and video games. The label "social deduction" is much newer than the games themselves.

The main types of social deduction games

Night and day games: Mafia and Werewolf

A few players are the Mafia (or the werewolves), and the rest are the town. Most games add a Doctor, who can protect one person each night, and a Detective (the Seer, in Werewolf), who can secretly check one player each night.

At night, everyone closes their eyes. The Mafia wake up quietly and choose someone to eliminate, the Doctor picks someone to save, and the Detective checks someone. In the morning, everyone learns who was eliminated. Then the town talks it over and votes someone out. This repeats until the town finds every Mafia member, or the Mafia equal or outnumber everyone else.

Play it: in the classic game, one person sits out as moderator to run the night. Our Mafia narrates every night out loud instead, so everyone plays. It takes 5 to 16 players, sets the number of Mafia for your group (1 for 5 to 7 players, 2 for 8 to 11, 3 for 12 or more) and times the day's discussion. The Werewolf village theme renames the roles Werewolves, Healer, Seer and Villagers with the same rules, which makes it a natural pick for Halloween games.

Secret word games: Imposter and Odd One Out

These are the fastest social deduction games, and the easiest to teach.

In Imposter, everyone sees the same secret word except the imposter, who only learns that they're the imposter. Going around the circle, each player says one word related to the secret. Too obvious, and you hand the imposter the answer. Too vague, and you look like the imposter. After a lap or two, the group votes. In many versions, a caught imposter gets one guess at the word, and a right guess steals the win.

Odd One Out, often called the undercover game, adds a twist: the odd player isn't told they're different. Most players get one word, like "coffee," and one gets a close cousin, like "tea." Everyone gives one-sentence clues, and slowly somebody's clues start to sound a little off. Since nobody knows for sure which side they're on, even the odd one out might vote for someone else. Versions are popular in Japan, where one is called Word Wolf, and in China.

Play it: Imposter is for 3 to 12 players, with an optional second imposter from 7 players and an optional category hint. Odd One Out also takes 3 to 12, with a second odd one from 7 players and a "blank twist" that gives the odd one no word at all.

Secret location games: Find the Spy

Everyone learns the same secret location, like an airport or a bakery, often with a role there. One player only learns they're the spy. Players take turns asking each other questions about the place without naming it. The group wants to prove they know it without making it obvious, and the spy wants to blend in while working it out. Anyone can call a vote, and the spy can stop the game at any time to guess the location. The card game Spyfall, designed by Alexandr Ushan and published in 2014, made this format widely known.

Location games are the most theatrical of the three. A pilot and a passenger would answer "What did you bring with you?" very differently, and that's half the fun.

Play it: Find the Spy is our own take on the format, for 3 to 12 players and best with 5 to 8. Each player gets a location and a role, the questioning runs on a 5, 8 or 10 minute timer, and an optional location list gives the spy a fair shot.

How to play Among Us in real life

Among Us, the online game by Innersloth, moved the same idea onto a spaceship. Crewmates do tasks while impostors secretly eliminate them. When someone finds an eliminated player or presses the emergency button, everyone stops to argue and vote. It came out in 2018, became a huge hit in 2020, and groups soon started acting it out at home and at birthday parties.

The in-person version usually works like this:

Set up task stations around the house or yard, each one short and simple: stack ten cups, sort colored blocks, finish a small puzzle.
Give each player a task list of a few stations to visit.
Deal roles in secret on folded slips of paper. One or two impostors is plenty for most groups.
Eliminate quietly. An impostor puts someone out with a gentle tap on the shoulder when nobody's looking. That player sits down where they are and stays silent.
Call a meeting. Whoever finds a seated player shouts "Meeting!" or rings a bell, and everyone gathers in one spot to talk and vote.
Win. The crew wins by finishing every task or voting out every impostor. The impostors win when they equal the crew.

Common house rules: walk, don't run, no hiding in closed rooms, and mark any rooms that are off limits.

Phone games with that feel. Among Us itself runs on phones, but each player needs their own device. With one shared phone, these come close:

Mafia has the same bones: secret eliminations, a group meeting and a vote. The phone announces who's out each morning, then the arguing starts.
Mafia's Quick mode is the most hands-on option. The phone privately deals one Winker and one Detective, then goes away. The Winker puts players out with a sneaky wink, and the Detective tries to name the Winker.
Imposter is the emergency meeting on its own: one clue each, a lot of side-eye and a vote.

None of these are connected to Among Us or Innersloth.

Which game to pick for your group size

3 or 4 players

With three or four, there's less to go on, so play short rounds and lots of them. Imposter, Odd One Out and Find the Spy all start at 3, and Find the Spy works especially well, because everyone gets questioned many times. Keep a tally of who wins as the hidden player. Mafia needs at least 5.

5 to 8 players

This is the sweet spot. Find the Spy is at its best, Imposter gets noisy in a good way, and Mafia works from five because the phone does the narrating. From about eight players, Mafia gets a second Mafia member and becomes much harder to read. With 7 or 8, try two imposters, two odd ones or two spies.

9 or more players

Mafia is the main event for big groups. It takes up to 16, and with 12 or more there are three Mafia. Imposter, Odd One Out and Find the Spy go up to 12, so with a bigger crowd, rotate people in between rounds or split into two circles. For more ideas, see party games for large groups.

Tips for first-timers

Expect to feel awkward the first time you lie. It gets easier by the second round.
Talk, but don't over-explain. Silence looks suspicious. So does a long speech nobody asked for.
Play the same way on both sides. If you're chatty as a villager, be chatty as the Mafia.
Vote on what people said, not on who they are. "She's always the liar" is not evidence.
Once you're out, stay out. No hints, no faces, no groans when the vote goes wrong.

Tips for hosts

Explain once, then play. Give the short version of the rules, answer a question or two, and start.
Play a practice round. Go through one night and one vote, or one lap of clues, then reveal everything and start the real game.
Settle house rules first. How do you break a tie? What if the spy guesses wrong? Are roles revealed when someone's out?
Keep accusations playful. Accuse the player, not the person. "You hesitated on that clue" is fun. Digging at someone's real character isn't.
Never use real personal secrets. Don't build clues, questions or accusations around something private you know about a player. The game's secrets are enough.
Stop while it's still fun. End on a great reveal, not on the tenth round.

Related: Paranoia

Paranoia isn't a deduction game, but it scratches a similar itch. One player reads a secret "Who...?" question and says a name out loud. Everyone else hears only the name, and a coin flip decides whether the question is revealed. There's nothing to solve and nobody to catch, just a room full of people wondering what was asked. It takes 3 to 12 players and makes a good warm-up before Mafia.