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Brain Slug: A Social Deduction Game

Brain Slug is a psychological twist on classic social deduction games where players face uncertainty not only about their allies — but even about themselves. Players are unknowingly influenced by parasitic "brain slugs" that take control during the night.

Thematic Setup

You're part of a crew stationed at a remote space outpost. Unknown to most, mysterious creatures called brain slugs have infiltrated the team, embedding themselves in human minds. Each night, slugs hijack control, causing one player to eliminate another—but no one knows who is truly responsible.

Gameplay Phases

  1. Morning A player is found eliminated. Discussion begins, filled with suspicion and second-guessing.
  2. Discussion Players share or fabricate who they tried to eliminate. The goal: deduce who is hosting the brain slug.
  3. Vote Players vote on who to eliminate based on discussion. Majority rules.
  4. Night Each player secretly chooses who they'd eliminate if they were the brain slug. Only the true host’s action goes through—but no one knows who that is.

The game continues until either the brain slugs outnumber the uninfected—or all slugs are eliminated.