The Primitive Library

Official Modules:

Third Party Modules:

1000 Meters Below

A 30-page megadungeon with Carboniferous vibes, packed with giant insects, mushrooms, and sprawling underground caves.

C.H.U.M.

A pamphlet adventure that introduces elegant raft mechanics. A gigantic sea creature is terrorizing the neighborhood.

Lair of the Hillcarver

A pamphlet adventure about claiming a new home by driving out its current occupant, a mighty Megatherium known as the Hillcarver. Don’t let its vegetarian diet fool you. Those claws hurt.

A giant centipede’s mountain cave contains what could be the greatest feast ever, if you can survive getting to the eggs. Along the way you’ll encounter a Man-Eater cult, sapient gibbons, desperate swamp dwellers, and more.

The Hunt for the Man-Eater

Hunt a vicious sabretooth. Go now. Hunt longtooth.

Murder, she painted in the walls of the cave

Hack for 100 Million B.C. where your cavemen become detectives who must solve a crime.

Those Old Bones

An expansion adding mystical and divine elements, along with building and developing a shared community.

Uglug Need Color

Uglug is a strange but talented cave painter, and he needs more colors.Players need to find new pigments and help Uglug create an epic prehistoric masterpiece.

Ugg Not Cub!

Your dear friend Ugg has been mistaken for a Furclaw’s cub and carried back to its den. Find the den and rescue your friend before Mama Furclaw realizes her mistake…

Wise One

A character add-on for playing a prehistoric genius with a touch of the supernatural.

Year 100 Million B.C. - Reglas Gratuitas

A free Spanish translation of the core rules.

Year 100 Million B.C. - Regles Gratuïtes

A free Catalan translation of the core rules.