Will you Survive?

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Free Core Rulebook

Desperate Environments


Acid in the atmosphere.  Magma beneath your feet.  And in the alien sky, the oppressive heat of a hostile sun.  This is a game about space travel – but not glamorous space travel like Star Trek.  Planetary travel that is more like the horrors the first explorers faced when they were alone at sea in a storm or in a new land under famine.  

Making it all the worse is that the political atmosphere is somehow even more acidic than the atmosphere.  Is the planet getting worse due to natural causes?  Or is something sinister afoot?  

You will face long odds.  The void of space was not meant for Man.  These planets are not “Mother” like Earth – you are under a Hostile Sun.

A full rulebook is here, but this website should allow innovative GMs to run a session with the key systems from the game.  

AC of the East Bay Martian Society contributed image at right.  

Worried about the future of Open Gaming / OGL?  These rules are available in a Creative Commons License SRD.

Desperate astronaught with alien pet on volcanic planet beneath a blazing sun.

Why Play?


Learn more about Under a Hostile Sun below.  Hostile Sun is illustrated with a wide variety of digital techniques including Adobe Fresco/iPad Pencil and Adobe Photoshop with Unsplash and iStock art under license.

Character Creation

Simple role under mechanics, a class system allow characters to fulfill a wide variety of roles.

Constant danger

Volcanos.  Acid.  Thunder. Ice.  Each planet explored is a new hostile environment – will you survive?

Resource System

Emphasis in Under a Hostile Sun is placed on how these strange climates and difficult economic conditions impact the people trying to build a home in the galaxy.







Three Eye green four-legged eye creatures look curiously at human space settlement under glass dome