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Cover of the cassandra protocol

the cassandra protocol

Solo roleplaying game · by La Lionne Publishing · in English
On Quisicosas since 21 May 2026
Featured in the newsletter of 21 May 2026 (on Substack)

What it is about

You are a crew member aboard a vast interstellar ship. You know something is coming: a critical failure, an impact, an infection, a paradox. Choose what it is from the start, or discover it along the way. You have proof. You have certainty. But No one believes you. You play to discover whether you avert disaster, or die knowing you were right. Setup Give your character a Name, Role on the ship, and Why You Know about what is to come (e.g. vision, mathematical equation, computer whisper, prophecy, sabotage you witnessed). Set your Goal marker to 3. You can use a spare d8 to track this number, or write it down in each of your journal entries. Write the final line of your journal now, but leave it vague, starting with, “This is where it ends.” When the ship’s story is told later, are you a bizarre footnote in history, or the reason anyone managed to survive? Second Guess System by William Lentz is licensed under CC BY 4.0.

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