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simgrammar the grammar of simulation

core loop

zone along roads -> GlassBox agents carry workers, goods, power, water, and sewage between buildings -> specialize the city in industries such as manufacturing, education, or tourism -> trade surpluses and share services with region neighbors -> pool resources into Great Works

design notes

GlassBox replaces statistical maps with units that hold resource bins and agents that move resources between them, so a house holds a count of people and food, water travels as units, and traffic jams are the visible sum of commuting agents. Agents take the first available job and the first empty home rather than keeping persistent lives, and vehicles take the shortest route instead of the least loaded one, which players read as pathfinding errors. Cities were smaller than earlier games by design, and region play links them asynchronously through shared services, trade, and Great Works.

relations

15 stored edges
influenced by
uses

Agent pathfinding

Sims go to the first job and first empty home they find; vehicles take the shortest route rather than the one with spare capacity.

core
uses

Asynchronous shared regions

Cities in a region connect by highway, rail, and water, trade resources, share services, and pool wealth into Great Works such as an arcology.

core
uses

Traffic congestion

Jams emerge from masses of commuting Sim agents on the road network.

core
uses

Zoning

Residential, commercial, and industrial zones are painted along roads; buildings develop inside them.

core
uses
supporting
uses

Deposit depletion

Map resources are mostly finite, though groundwater recharges.

supporting
uses

Fluid pipe networks

Water and sewage move as units through pipes between pumps, treatment, and buildings.

supporting
uses
supporting
uses

Pollution spread

Pollution and traffic cross city borders within a region.

supporting
uses

Population strata

Residents and businesses come in wealth levels with different demands.

supporting
uses

Power grid

Power is carried as resource units from plants to buildings.

supporting
uses

Service coverage

Service buildings dispatch vehicle agents to calls.

supporting
uses

Supply-demand pricing

A simulated global market raises and lowers prices of key resources with supply and demand.

supporting

backlinks

computed from other records

sources

2
Wikipedia contributors (2026). SimCity (2013 video game). Wikipedia
Frank Cifaldi (2012-03-07). GDC 2012: Breaking down SimCity's Glassbox engine. Game Developer

provenance

runs in log/runs
2026-10-24
created2026-10-24-catalog-gacatalog
2026-10-24
reviewed2026-10-24-review-fixesmaintenance