Determinism end-to-end
Every roll flows through one seeded RNG. Identical seeds produce identical event streams — including weather, creature decisions, and the rise of cities.
οἰκουμένη · the inhabited world
A deterministic hex world
where civilizations emerge... if you let them.
In Oikoménē, you play an Outsider in the otherwise deterministic ecology of the world.
Best in Chrome, Edge, or Safari 26+. ~30 MB initial load.
Three things that make it strange
Ecology as data, not script
Warthogs, wolves, deer, vampires and zombies all share one component-trait system. Populations are tracked per-biome; predators flock to prey; animals flee from monsters by species pair.
Civilization that grows itself
Wanderers scout for safe regions, settle near each other above a safety threshold, and build villages → towns → cities — or get razed and leave Ruins on the map.
About
Oikoménē is a single-player demo today, but the codebase is built around a strict sim/UI boundary so the same deterministic core can later run as a server for many players sharing one world.
This page is a public-facing slice of the current build, deployed automatically
on every push to main. Saves are discarded in the web demo;
for persistent worlds, grab the desktop build.