This project is an AI simulation of a variant of the popular One Night Ultimate Werewolf games by Bezier Games.

One Night Ultimate Werewolf is copyright by Bezier Games Inc. This project is a non-commercial work intended for AI research only.

The purpose of this project is to try to build AI bots that can make reasoned deductions in a social deduction type of game and deceive each other and potentially even human players.

Only one mode is supported at the moment: an AI vs AI mode in a .NET Console app.

Down the road I hope to add a desktop and browser version of the application as well as the ability for a human player to play against AI agents.

Currently partial or complete support for the following roles is implemented:

• Werewolf
• Villager
• Insomniac
• Sentinel
• Apprentice Seer
• Mason
• Revealer
• Exposer
• Mystic Wolf
• The Thing (that goes bump in the night)
• Seer

Players currently build a probabilistic model of what every card in the game might be given their knowledge and the set of cards in the deck.

At the end of the round, each player randomly votes for one of the cards they believe are most likely to be a werewolf

This section will be greatly expanded in the future as the engine's capabilities evolve.

For now, the system uses an event-based approach to build a probabilistic model of where each card in play might be.

Each agent has their own unique probabilistic model of what every card in the game might be (including their own). Various observed events can impact the information known or believed about each card, which helps players narrow down who they should vote for as well as what team they wound up on (once roles that move cards are part of the simulation in phase 3).

Everything that happens in the game is represented as an event, from players looking at their initial roles to werewolves waking up, to the insomniac looking at her card, to players claiming roles or voting.

Not all players see every event, so each player has their own internally known set of events.

The set of known events is used to build the probabilistic model of what each card contains.

In the future, AIs will be able to consider events they didn't witness directly into their reasoning, as we add in support for moving cards in Phase 3.

Phase 1 focuses on the roles that do not involve swapping cards around. The focus for this

Completed roles in Phase 1 are:

• Werewolves
• Villager
• Insomniac*
• Sentinel*
• Apprentice Seer
• Masons
• Revealer
• Exposer
• Mystic Wolf
• The Thing (that goes bump in the night)
• Seer

Note: the Insomniac and Sentinel roles don't make complete sense until paired with card moving abilities and will be expanded as features grow, but adding them early helped establish baseline AI deductive capabilities

Planned features in Phase 1 are:

• Night Phase
• Day Phase
• Probabilistic model of what cards are at play start
• Simple voting
• Claiming Roles
• Wolves Falsely Claiming Roles (most probable center card given existing claims)
• Seer / Apprentice Seer Claims share what card they viewed
• Windows Client
• Suspecting fake claims
• Players sharing their suspicions
• Voting factoring in suspicions of others
• Voting in a Circle (if thinking no werewolves present)
• Player Control
• Game Setup (pre-defined games)

This phase focuses on additional roles that want to be detected / voted.

No card moving is going on yet, but the social / deductive engine is being refined during this phase.

Planned roles:

• Hunter
• Bodyguard
• Tanner
• Apprentice Tanner
• Mortician
• Prince
• Minion

Planned features:

• Tanner AI
• Mortician AI
• Mortician Randomness
• Game Setup (custom games)
• Random Game Generator
• Batch Game Simulation
• Class Win / Loss Ratio Stats
• Team Win / Loss Ratio Stats

This phase focuses on additional roles that want to be detected / voted.

Planned roles:

• Beholder*
• Squire*
• Psychic
• Aura Seer
• Dream Wolf

Note: the beholder, and squire roles don't make complete sense until paired with card moving abilities and will be expanded as features grow, but adding them early helped establish baseline AI deductive capabilities

Planned roles:

• Alpha Wolf
• Blob
• Paranormal Investigator
• Cursed

Planned features:

• Phase by phase probabilistic model of the board
• AI Agents attempt to determine which team they're on

Planned roles:

• Robber
• Troublemaker
• Witch
• Drunk
• Village Idiot
• Rascal

Planned features:

• Phase by phase probabilistic model of the board
• AI Agents attempt to determine which team they're on
• Ex-wolves will identify old partners when claiming
• Ex-apprentice tanner will identify old tanner
• Dream wolf special slot
• Witch will sometimes take dream wolf card
• Drunk will sometimes take dream wolf card

• Mark-Related Roles
  • Vampire
  • Pickpocket
  • Gremlin
  • Priest
  • Marksman
  • Copycat
  • The Count
  • Cupid
  • Diseased
  • Renfield
  • The Master
  • Instigator
  • Assassin
  • Apprentice Assassin
• Alien-Related Roles
  • Alien
  • Synthetic Alien
  • Zerb (Alien)
  • Groob (Alien)
  • Cow
  • Leader
  • Body Snatcher
  • Nostradamus
• Misc. Roles
  • Doppleganger
  • Oracle
  • Empath

This application is built in C# on .NET 6 in Visual Studio 2022 and JetBrains Rider, but the core architecture is part of a class library and should be portable to other versions of .NET.

Unit testing is performed in NUnit with Shouldly assertions.