
- BGG rank
- BGG #140
- BGG rating
- 8.0
Tainted Grail: The Fall of Avalon
- 1–4 players
- 60–120 min
- Complexity 3.4/5
- 2019

Expansion for Mansions of Madness: Second Edition
Rules assistance for Mansions of Madness: Second Edition – What Lies Within
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

What would you like to know?
Answers come from the official rulebook, with the page to check.
Mansions of Madness: Second Edition – What Lies Within is an expansion for Mansions of Madness: Second Edition released in 2016 for 1–5 players, 120–150 minutes per game, and ages 14 and up. Its main mechanics are Hand Management, Area Movement, and Dice Rolling.
A murder in Southside leaves a home abandoned–except for the strange noises coming from the cellar… What Lies Within is a scenario for 1-5 investigators in which a murder is only the beginning of the inexplicable occurrences in one Arkham mansion. Investigators will explore a murder scene, fend off terrible creatures, encounter strange phenomena, and investigate the noises coming from the cellar of the supposedly empty house. They must discover why the victim was murdered–and what he did with his life before it was so violently ended–in order to leave the mansion alive. —description from the publisher
Mansions of Madness: Second Edition – What Lies Within supports 1–5 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 Mansions of Madness: Second Edition – What Lies Within is 120–150 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 Mansions of Madness: Second Edition – What Lies Within 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.
Mansions of Madness: Second Edition – What Lies Within has a complexity rating of 3.0 out of 5 from BoardGameGeek players, which makes it a medium-weight game. The rating reflects how much rules knowledge, planning and decision-making a typical game demands. Expect a longer first teach for heavier games, and use a preparation guide before game night.
Mansions of Madness: Second Edition – What Lies Within belongs to these categories: Exploration, Adventure, and Expansion for Base-game. Its main mechanics are Hand Management, Area Movement, and Dice Rolling. 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 catalogue lists Mansions of Madness: Second Edition – What Lies Within as an expansion for Mansions of Madness: Second Edition. Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need Mansions of Madness: Second Edition to use it. Check that your edition of Mansions of Madness: Second Edition is compatible, as some expansions were revised between editions.