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Under a Hostile Sun

Suggested Price $0.99

The galaxy recently had a great upheaval.  Now many, seeking to escape corrupt local governors and war-ravished worlds, are desperately taking to space exploration.  It's a hope for a better life.  But at a cost.  The planets explored will include environments not easily inhabitable - volcanic hellscapes, colossal storms, radiation and more.  But with some grit, and a firm faith in the Immutable, maybe, just maybe, you and your brave team of settlers will be able to survive and greet the alien sun, not as an existential threat, but as a friend. 

  • A rules-lite exploration-focused RPG.  There is no combat system - rather the enemy is the brutal environment you are trying to survive in.
  • Rules-light but exciting system for Environmental Encounters that encourages risk vs reward decisions.
  • Currency system that allows easy tracking of resources mined from the planet.   Find alien creatures to produce even rarer resources - maybe even the Prime Matter- unlimited potential- itself.
  • Alchemy System that allows for wide creativity.
  • Character Sheets fit on one index card.  
  • Illustrated with Adobe Photoshop / Fresco.
  • Licensed under the new ORC LICENSE !
  • The 2024 Edition of the title with an improved layout and streamlined Alchemy and Creature rules has been uploaded!
“Under a Hostile Sun is a fantastic option for sci-fi lovers as it offers opportunities to explore and complete creative, plot-driven missions. With a well-balanced encounter system, the game provides a fun mix of role-play and mechanics. Very simple to learn and play, which makes it accessible to all!” -AC
“Under a Hostile Sun is an interactive and collaborative multiplayer RPG game. Players who have an affinity for teamwork and are mission-driven would enjoy engaging in such an adventure.” -Blanca

Astronaut in space is watched by Cosmic Eye



  • Under a Hostile Sun Core rulebook
  • Ancient Empires, Modern Greed Campaign
  • Seven maps (both with and without grids) to support the Ancient Empires campaign
  • Tokens for the Ancient Empires Campaign
  • ORC License page

Spaceship takes off in strange forest

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Reviews (1)
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April 15th, 2023
Really enjoyed Under a Hostile Sun! The system is well balanced and encourages creative role play, exploration, and resource management. The mechanics are pretty smooth and were easy to pick up. We played with someone who was completely new to RPGs and [...]
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Product Information
Rule System(s)
File Size:
90.75 MB
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File Last Updated:
March 21, 2024
This title was added to our catalog on April 12, 2023.
Martian Muckraker Publishing
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