Machina Arcana (Second/Third Edition)

Explorers descend into an ancient underground complex of unknown origin, in a steampunk world that Lovecraft would recognise: the monsters come straight out of the Cthulhu mythos. You collect equipment, use your surroundings, fight what lurks in the dark and push the story forward chapter by chapter. The tale is split into scenarios, each a self-contained game with its own narration and finale. It is cooperative, dice-driven and built so no run feels exactly the same. This second/third edition dates from 2019, plays one to four, and wants a long afternoon or evening: about two and a half hours.