Mansions of Madness: Second Edition

AI-friendly board game rules summaries — use with Claude, ChatGPT, or any AI assistant

Overview

Mansions of Madness: Second Edition is an app-driven cooperative Lovecraftian horror game. The companion app serves as the Keeper, managing scenarios, monsters, puzzles, and story events. Players take the roles of Investigators exploring modular mansion maps, solving mysteries, fighting monsters, and trying to maintain their sanity. The app handles all hidden information and scenario logic.

Components

Setup

  1. Launch the companion app and select a scenario.
  2. Follow the app’s instructions to place map tiles, tokens, and starting items.
  3. Each player selects an investigator and takes their card, figure, and starting possessions.
  4. Place investigators at the starting location.

Turn Structure

Each round consists of two phases:

1. Investigator Phase

Each investigator takes a turn consisting of up to 2 actions (may perform the same action twice):

After all investigators act, one player presses “End Investigator Phase” in the app.

2. Mythos Phase

The app controls this phase entirely:

Actions

Combat

  1. Select a weapon and target monster.
  2. The app shows the test (skill + dice).
  3. Roll dice. Each 6+ is a success (5+ with bonuses). Blanks are failures.
  4. Apply damage to the monster (tracked in the app).
  5. Monsters attack during the Mythos phase – the app tells you the test and consequences.

Skill Tests

The app frequently calls for skill tests (Strength, Agility, Observation, Lore, Influence, Will):

Puzzles

The app presents interactive puzzles (slide puzzles, code-breaking, lock-picking). Players solve them within the app interface, with each attempt counting as an action.

Scoring / Victory Conditions

Special Rules & Edge Cases

Player Reference

Investigator Actions (2 per turn) Effect
Move Move up to 2 spaces
Explore Reveal exploration token via app
Search Find items via app
Attack Fight a monster (dice roll)
Interact Use a person/object via app
Component Action Use item/ability

Skill test: Roll dice = skill value; 5+ = success (usually)