Purpose-built system for solo and multiplayer mysteries enables flexible play options for any group size
Unique dice and card draw resolution mechanics allow for dynamic, chainable special actions and abilities
36 unique clues and 120 events provide a rich, evolving narrative experience
Self-contained story with unlimited possibilities ensures each session is fresh and engaging
Quickly builds unique characters at the table for personalized gameplay
Summarized by Shop
When the anomaly appeared at the Earth's core, the Substratum Protocol was initiated. You are the best and brightest scientists we have left, our last hope to stem the apocalypse. You are the Substratum Expedition Team. Descend. Learn. Survive. A solo+ survival mystery RPG using step-down dice and card draw mechanics, Substratum Protocol