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simgrammar the grammar of simulation

core loop

gather from the shared ecosystem -> specialize in skills and craft at tables -> trade through player stores and currencies -> propose and vote on laws and taxes -> research technology to stop the meteor -> manage pollution and species populations before impact

design notes

Eco makes the ecosystem a shared commons: each player's harvesting and pollution changes species populations and the climate for everyone on the server. Its answer to overexploitation is player-made institutions rather than designer rules, with enforceable laws, taxes, and currencies, and simulation data that players can cite as evidence in debates. It began as an educational project funded in part by the U.S. Department of Education.

relations

15 stored edges
uses

Crisis countdown

A meteor is set to strike in thirty days, and players must gather resources and research technology to stop it without harming the world.

core
uses

Food web

Thousands of plants and animals from dozens of species grow across the world; overhunting or overharvesting can drive a species extinct, and a disruption in one species cascades across the planet.

core
uses

Player legislation

Players propose laws in a programmable rule system and vote on them, the game enforces ratified laws, and elections set tax rates and community funds; governments range from dictatorships to lawless, trust-based communities.

core
uses

Pollution spread

Mining waste and industrial pollution poison rivers and kill farms, and excessive air pollution raises sea levels.

core
uses

Agent skills

Varied food and larger homes earn skill points spent on specialties such as farming, hunting, trade, and engineering.

supporting
uses

Contracts and orders

Players post labor contracts for others to fulfill.

supporting
uses
supporting
uses

Modding API

The official modkit lets servers add C# items, recipes, and rules.

supporting
uses

Planetary climate

Accumulated pollution changes the climate and sea level.

supporting
uses

Player-driven markets

Players run stores and currency exchanges with fiat or resource-backed currencies and set exchange rates.

supporting
uses

Production chains

More than 30 craft tables turn materials into goods across hundreds of recipes.

supporting
uses

Renewable regrowth

Plant and animal populations recover over time unless harvested faster than they regrow; cutting too many trees reduces how much air pollution is absorbed.

supporting
uses

Seasonal world reset

Each world is bounded by a meteor due in thirty days, so a server's run ends with stopping it or with impact, and servers are commonly wiped and restarted as fresh worlds.

supporting
uses
supporting
uses
supporting

backlinks

computed from other records

sources

2
Wikipedia contributors (2026). Eco (2018 video game). Wikipedia
(2026). Eco on Steam. Steam

provenance

runs in log/runs
2026-10-24
created2026-10-24-catalog-gicatalog
2026-10-25
reviewed2026-10-25-contributor-readinessmaintenance