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simgrammar the grammar of simulation

core loop

loot houses and stores -> avoid or fight zombies drawn by sight and noise -> manage hunger, fatigue, injuries, and moodles -> utilities fail and seasons turn -> barricade, farm, and level skills -> survive until death

design notes

The framing question is how the character dies, not whether: zombie infection is always fatal in an unmodified game, so play is about extending a doomed run. Water and power shut off within the first month, after which erosion and overgrowth spread, giving the sandbox a scheduled decline. Zombies respond to sight and hearing and hordes migrate, so noise from actions shapes risk; there is no mechanic id for noise attraction yet (proposal filed). The game has been in early access since a paid tech demo in May 2011, with Steam early access from November 2013 and Build 42 in open beta from December 2024.

relations

18 stored edges
uses

Agent skills

Skills such as carpentry and cooking level from activities, and skill books and magazines speed or unlock progress.

core
uses

Injury body model

Wounds such as scratches, lacerations, bites, and fractures are tracked per body part with bleeding and bandaging; zombie infection is spread by saliva and blood and is always fatal.

core
uses

Stimulus attraction

Zombies respond to sight and hearing, so noise from actions such as gunfire or breaking windows draws them toward the survivor, and hordes migrate.

core
uses

Survival meters

Moodles for hunger, thirst, fatigue, endurance, panic, stress, boredom, unhappiness, temperature, wetness, pain, bleeding, and sickness each grow in severity and penalize combat, movement, carrying, or healing.

core
uses

Crisis countdown

Water and power shut off within about a month, forcing preparation.

supporting
uses
supporting
uses
supporting
uses

Fog of war

A vision cone limits what the survivor sees.

supporting
uses

Building placement

Carpentry builds walls, barricades, and forts.

supporting
uses

Hand crafting

Weapons, tools, and barricades are crafted; Build 42 overhauled crafting.

supporting
uses

Modding API

Full Lua modding through the Steam Workshop.

supporting
uses

Permadeath

Death ends the character; a new survivor can start in the same world.

supporting
uses

Personality traits

Occupation and positive or negative traits are chosen at character creation; occupation also sets spawn location.

supporting
uses

Seasons

A climate system with seasons changes gear needs.

supporting
uses

Spoilage

Food rots, and refrigeration ends when power fails.

supporting
uses

Vehicle dynamics

Vehicles have physics and part condition.

supporting
uses
supporting

sources

3
Wikipedia contributors (2026). Project Zomboid. Wikipedia
The Indie Stone (2026). Project Zomboid on Steam. Steam
PZwiki contributors (2026). Moodles. PZwiki

provenance

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