Substratum Protocol

Substratum Protocol RPG thrusts you into a desperate expedition to the Earth's core. As part of the Substratum Expedition Team, you are one of the last scientists on Earth, tasked with unraveling and stopping a mysterious anomaly threatening to tear reality apart. Descend into the depths, uncover clues, and craft the "Last Hypothesis" – your final plan to save humanity from the brink of apocalypse.

This survival mystery RPG combines hard science fiction with cosmic horror and features unique step-down dice and card-draw mechanics. Play solo or with 2–6 players guided by a GM. With 10 sectors to explore, 120 unexpected events, and 36 clues to discover, the game offers endless challenges and mysteries as you race to uncover the truth.