Casus

FIELD MANUAL

How to play the spy game (imposter word game)

The spy game, also called the imposter game, "who is the spy" or undercover, is a social deduction party game for 3 or more people. Everyone shares a secret word except the spy, who has to blend in. These rules work with paper slips or with any app.

Updated 14 October 2026

Goal: the innocents want to find the spy; the spy wants to stay hidden or figure out the secret word. A round takes 3 to 15 minutes and needs no board, no cards and no game master.

Setup and round flow

  1. 1. Choose a secret word. Pick a category everyone knows (animals, foods, places, jobs…) and a word from it. With paper: one person writes the word on every slip except one, which says "SPY", folds them and that person also plays. With an app, the phone picks the word and deals the roles.
  2. 2. Deal the roles in secret. Every player looks at their slip or card alone. Innocents learn the word, the spy only learns they are the spy. Nobody reacts out loud.
  3. 3. Start the timer. 5 to 8 minutes works for most groups. Saying the category out loud is allowed (the spy learns it too).
  4. 4. Ask questions in turns. A player asks anyone a question about the word ("Would you find this at a wedding?"). The person who answers asks the next question. You may not say the word itself.
  5. 5. Accuse and vote. When time runs out, or when someone calls a vote, everyone points at the player they suspect on the count of three. The player with the most votes is revealed.
  6. 6. Spy's last guess. If the spy is caught, they get one chance to name the secret word. A correct guess steals the win. If an innocent is voted out, the spy wins.

Scoring

Play several rounds and keep score. A common system:

Popular variants

Tips for innocents

Tips for the spy

Quick answers