
- BGG rank
- BGG #330
- BGG rating
- 7.8
Mind MGMT: The Psychic Espionage “Game”
- 1–5 players
- 60 min
- Complexity 2.9/5
- 2021

Expansion for Corps of Discovery: A Game Set in the World of Manifest Destiny
Rules assistance for Corps of Discovery: Expansion 4 – Fog
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

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Answers come from the official rulebook, with the page to check.
Corps of Discovery: Expansion 4 – Fog is an expansion for Corps of Discovery: A Game Set in the World of Manifest Destiny released in 2025 for 1–4 players, 60 minutes per game, and ages 14 and up. It was designed by Jay Cormier and Sen-Foong Lim and its main mechanics are Deduction.
Something about the fog that’s rolled in plays tricks on your mind. While the fog is obscuring your vision, you can no longer rely on your pre-existing knowledge of the land to find the critical resources you need to survive. In this expansion each terrain rule has been changed, but you don’t know how. Will you be able to navigate your way to safety or will you believe the lies that your eyes tell you while you’re surrounded by this otherworldly haze? This Expansion also includes new Reference Boards and new Maps to play each of the previous chapters - but with Fog! So imagine trying to kill 3 Minotaurs in the Fauna Chapter - BUT - all the terrain rules are mixed up? This takes Corps of Discovery to a whole new level! —description from the publisher
Corps of Discovery: Expansion 4 – Fog supports 1–4 players according to the catalogue. This range comes from the publisher’s listed player count, so the game can be set up for any group size within it. Some setups, rules and scoring details may still vary by player count, so check your edition’s rulebook for the exact configuration.
The listed playing time for Corps of Discovery: Expansion 4 – Fog is 60 minutes. This is the publisher’s estimate for a full game. The actual duration depends on the group, the player count and familiarity with the rules: first sessions usually run longer, while experienced groups often finish faster. Setup and teaching time are not included in this estimate.
The catalogue lists Corps of Discovery: Expansion 4 – Fog for ages 14 and up. This is the publisher’s recommendation and reflects reading demands, rule complexity and small components rather than theme alone. Younger players can often join with help from an adult, so check the age guidance on your edition and consider your group’s experience with board games.
Corps of Discovery: Expansion 4 – Fog belongs to these categories: Deduction, Adventure, and Expansion for Base-game. Its main mechanics are Deduction. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of Corps of Discovery: Expansion 4 – Fog are: Jay Cormier and Sen-Foong Lim. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists Corps of Discovery: Expansion 4 – Fog as an expansion for Corps of Discovery: A Game Set in the World of Manifest Destiny. Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need Corps of Discovery: A Game Set in the World of Manifest Destiny to use it. Check that your edition of Corps of Discovery: A Game Set in the World of Manifest Destiny is compatible, as some expansions were revised between editions.