“Matt’s Rule” says all the rules must fit in 20 pages. Fine! But I plan to add an appendix section.
The “Matt’s Rule” version does not have spellcasters or other races, so it is no fantasy or low fantasy in its intent. It also does not have gunpowder. So, I figure what it SHOULD have is a quick and entertaining way to build a world setting.
This document is a world building appendix, to create regions that can then be put adjacent to each other, filling your world out as organically as you please.
Tomorrow I will post an example.