CRITICAL O2

CRITICAL O₂ 

A minimal solo derelict survival crawl

You are trapped aboard a drifting, dying ship. Something has gone wrong. The lights are failing. The air is running out.

Your only chance is to reach your Goal before the oxygen hits zero and the ship finishes what it started.

What you need

• 1d6
• This ruleset
• Paper and pencil
• 20–40 minutes

What you get

• A hard oxygen clock that turns every decision into a risk
• Suit Integrity that degrades under pressure
• Limited Batteries that force hard choices
• Procedural ship generation with atmospheric room prompts
• A simple d6 Oracle for all uncertain actions
• Encounters, malfunctions, leaks, and the quiet dread of a ship that does not want you here

No complex inventory. No long rulebook. Just you, the dark, and the slowly emptying tank on your waist.

Define a Goal. Draw the map as you go. Search, pry, rest, or run. Every turn costs oxygen. Every failure brings the ship closer.

Will you make it to the escape pod… or will the derelict claim another one?

Includes

• Full rules (d6 Edition)
• Quick Start Guide
• Room Narrative Prompts
• Survivor Log / Character Sheet
• Print-friendly player aid

Lean. Atmospheric. Unforgiving.

Credits

CRITICAL O₂  

A minimal solo derelict crawl

Design & Writing  

Drag 'Em Studios, WizardOfOdd 2026

https://dragemstudios.neocities.org/

System  

d6 Oracle

Inspiration  

Classic sci-fi horror, solo RPG design, and the quiet terror of running out of air.

Special Thanks  

To everyone who plays in the dark and keeps rolling.

Version 1.2  

For solo play.