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Suggested Price $2.00

24XX is the free version of the rules used by the 2400 series of RPGs, with advice on how to adapt these files for your own game. The SRD is released under a Creative Commons Attribution 4.0 license. Materials include:

  • Plain text system reference document (SRD)
  • PDF versions for layout reference
  • Affinity Publisher version for use as template
  • Vector logo usable in 24XX compatible games
  • Google Slides and Google Docs versions for use as templates
  • Adobe InDesign templates provided courtesy James Lennox Gordon of Unknown Dungeon, designer of the 1400 lo-fi hi-fantasy series based on 24XX SRD

24XX games prioritize description and narrative positioning over detailed rules processes, taking the highest die rolled over mental arithmetic, and polyhedral dice over only one shape of die (because funny-shaped things are fun to roll). While 2400 is a sci-fi series, you're welcome to use these rules for whatever setting you like. And if you use any of this material in your own games and hacks, please get in touch to let us know!

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Discussions (1)
Customer avatar
November 30, 2020 12:46 pm UTC
CREATOR: Curious as to how you do COMBAT and "hit points" or Harm as you describe? Anyway to give a Combat example/explanation involving a character and a creature for us? Thanks.
Customer avatar
Jason T December 15, 2020 11:20 pm UTC
I wrote a blog post that might help:
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Product Information
Electrum seller
File Size:
54.43 MB
Original electronic Click for more information
Scanned image
These products were created by scanning an original printed edition. Most older books are in scanned image format because original digital layout files never existed or were no longer available from the publisher.

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For printed books, we have performed high-resolution scans of an original hardcopy of the book. We essentially digitally re-master the book. Unfortunately, the resulting quality of these books is not as high. It's the problem of making a copy of a copy. The text is fine for reading, but illustration work starts to run dark, pixellating and/or losing shades of grey. Moiré patterns may develop in photos. We mark clearly which print titles come from scanned image books so that you can make an informed purchase decision about the quality of what you will receive.
Original electronic format
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File Last Updated:
March 29, 2022
This title was added to our catalog on November 10, 2020.
Pretendo Games
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