SISTR Mothership RPG Operating Manual for Sci-Fi Horror RPG


Shipping to United States: $3.75

This is a separate Operating Guide with the Mothership rules. If you are only getting the SIS/TR box set (and not A Rare Geometry), the box set comes with system-neutral rules. If you play Mothership and want these rules, add this on as well or use the free PDF we will give you soon.

SIS/TR, A Rare Geometry does have the Mothership rules for SIS/TR.

36 pages
Full color

Shipping from United States

Processing time

5-7 business days

Customs and import taxes

Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.

Payment Options

Secure options
  • Accepts Etsy gift cards

Returns & Exchanges

I don't accept returns, exchanges, or cancellations

But please contact me if you have any problems with your order.

Frequently Asked Questions

Are packages insured?

Please note, only orders of $35 or more are insured via USPS.

Wholesale availability

Yes, on books, stickers, and shirts. Please message us for more information.

Reviews (1)


I bought this knowing it was a duplicate of the manual in the boxed set (with the dice) and the "A Rare Geometry" adventure module. Why would anyone do such a thing? I like the fact that this book (again, duplicated in the boxed set) is saddle-stapled. Given the useful charts and sheets, it is kind of nice to able to lay those pages flat (or to pull them apart after removing the staples) to have a high quality print of it to set dice on, to keep track of things, etc. Can you live without purchasing this? Absolutely. However, if you are not getting the boxed set (which is foolish, you should--and get the frost turret die too) or the "A Rare Geometry" module, having this Zine and different, colored d6 dice would allow you to deploy this cool AI turret. Still, I knew what I was doing getting this duplicate, and I'm glad I did!

Legal imprint