In Ruins is a GM-less dungeon-building game for 1-6 players. Part collaborative story game, part tactical network-building game, players tell the story of a castle as it is built, falls into ruins, and is taken over by rival factions. In the 2 hour game, players will create a dungeon, fully stocked with competing factions, hazards, monsters, and NPCs, that can then be explored with their fantasy TTRPG of choice.

Full play-time of 1.5-2 hours can be divided up over multiple sessions. Includes story-game aspects where players collaborate to create the history of the castle. The process of laying out the castles rooms in the first round and then ruining them in the second round creates the dungeon. Players control classic fantasy factions (such as Kobolds, Cultists, and Undead) with asymmetric abilities as they vie for dominance over the dungeon.