Substratum Protocol

Substratum Protocol is a solo+ survival mystery TTRPG utilizing step-down dice and card draw mechanics, Substratum Protocol is playable as both a solo game or guided by a GM.

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.  

The game intertwines hard science fiction with the inescapable, unknowable horrors of an anomaly tearing apart reality.

Purpose-built for solo and multiplayer mysteries
Unique dice and card draw resolution mechanics
Take special Actions whose outcomes can chain together
Collect cards during Skill Checks to power your suit's abilities
A self-contained story, with unlimited possibilities and outcomes
Quickly build unique and interesting characters at the table
36 unique clues to discover, 36 questions to answer
10 sectors to explore, each one stranger than the last
120 events and encounters to surprise and stump your players
Build the Last Hypothesis: When they have learned all they can, the scientists must pour over their knowledge of the anomaly, construct the Last Hypothesis and enact their plan. Will it be enough?