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CORE Micro

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As heard in Actual Play on LegendsOfTabletop, MFGCast, and Fandible:

A Hybrid Microsystem built for Speed & Flexibility

Stat your world in no time.
Expand your options in realtime.

CORE blends traditional RPG concepts with narrative techniques to create unpredictable character-driven stories, while the GameMaster focuses on engagement and continuity. The system offers lots of creative agency and just a tiny bit of crunch. It's built for speed, flexibility, low prep, and high collaboration.


The CORE philosophy: use the smallest scale and a simple universal mechanic for everything, both during character generation and in play. The system is built to allow quick and reasonable GM rulings without sacrificing narrative flexibility. Dice rolls and tables in CORE don't give you a number, a fact, or a pass/fail. They give you a simple prompt that sends you right back into the fiction.

Designed by Tod Foley - creator of CyberSpace, DayTrippers, and Watch the World Die -
the CORE system will let you try any weird thing, and stay out of your way.
It's easy for Players to learn, and easy for GMs to hack.


Version 3.0

The CORE Micro SRD is designed for GMs and Game Designers alike.
Built to be hacked for your world. Join the growing community of CORE developers.
You can find us on Twitter | Reddit | Discord | Facebook

"The system is narration-based with mechanics that practically melt away."
- Jesse Pyne, Monster Hunt Cast

"A flexible system. It balances story and rules, and it's easy to pick up and play."
- Shawn Koch, author 'Liquid Hitler'

"Core is a fun, minimalist rules set that doesn't get in the way of good story telling."
- John Haremza, Legends of Tabletop

CORE MICRO is published under the Creative Commons Attribution License.
You may use or
modify these rules for your own games, either for free or for profit,
simply by attributing the CORE system and author within your work.

Explore the Worlds of CORE Micro - or build your own!

DayTrippers Core Rules

DayTrippers - A Surreal Sci-Fi
Reality-Hopping RPG

UnNatural - A CORE World of Supernatural Adventure

UnNatural - A CORE World
of Supernatural Adventure

Monster Hunt

Monster Hunt - A CORE World
of Post-Apocalyptic Slaying

Monster Hunt Magic

Monster Hunt Magic - A Spellcasting
Supplement for CORE

Welcome to the WWA

Welcome to the WWA - Woodland Creature
Wrestling Association


COREthulhu - A CORE World
of Eldritch Horror

Far Above The World

Far Above The World -
A CORE-based Orbital Odyssey


BOGG - A Far-Flung World
of Posthuman Adventure

Impact 1472!

Impact 1472! -
Pre-Colonial Fantasy Adventure

 Customers Who Bought this Title also Purchased
Reviews (3)
Discussions (0)
August 24th, 2022
Very quickly topped the list of my favorite systems. You can run and play anything using CORE Micro and it feels great. Versatile as all heck, Simple and straight forward. It's very easy to learn and adapt to, which just means more time playing [...]
August 24th, 2020
Excellent as always from this creator! A great, easly understood instruction book. [...]
August 23rd, 2020
CORE is a light and nimble system that doesn't get in the way of telling good stories. Its a narrativistic system with solid player facing elements like progressive character development. CORE can be easily reskinned to tell stories in any kind [...]
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 Recent History

Product Information
Copper seller
Rule System(s)
Publisher Stock #
File Size:
0.62 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.

For PDF download editions, each page has been run through Optical Character Recognition (OCR) software to attempt to decipher the printed text. The result of this OCR process is placed invisibly behind the picture of each scanned page, to allow for text searching. However, any text in a given book set on a graphical background or in handwritten fonts would most likely not be picked up by the OCR software, and is therefore not searchable. Also, a few larger books may be resampled to fit into the system, and may not have this searchable text background.

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
These ebooks were created from the original electronic layout files, and therefore are fully text searchable. Also, their file size tends to be smaller than scanned image books. Most newer books are in the original electronic format. Both download and print editions of such books should be high quality.
File Last Updated:
June 13, 2022
This title was added to our catalog on August 17, 2020.