one dataset · paper, tables, graph, wiki
simgrammar the grammar of simulation

definition

Each service building periodically spawns a walker that follows roads; as it passes, it writes a coverage value to nearby houses, which decays over time until the next visit. In Caesar III, as reproduced by the Julius reimplementation, a roaming walker first heads for a road point about 8 tiles out in a cardinal direction that rotates with each spawn, then wanders, turning pseudo-randomly at intersections and ending its walk at dead ends. Culture, health, and religion walkers set a per-service house value to 96, which decays by 1 on each periodic update; prefects reset fire risk to zero and engineers reset collapse risk to zero. Inputs: building location, road network, random turns. Outputs: per-house coverage values that gate housing evolution and prevent fires or collapses.

player experience

Designing for wanderers. Players build looping road blocks so walkers cover the right houses, use roadblocks where available, and watch for houses that a walker never reaches. Knowing that coverage depends on chance makes layout feel like guiding a crowd.

design levers

  • walker roaming range and spawn interval
  • turn rule at intersections: random, biased, or destination-based
  • coverage radius around the walker and decay rate on houses
  • roadblocks or other routing controls
  • number of walker types and services per type

failure modes

  • Randomness that leaves some houses uncovered causes devolve-evolve flicker.
  • Walker logic that needs community analysis to understand frustrates players.
  • Too many walker types multiply layout constraints until blocks become formulaic.

dynamics

  • Standard block layouts (looped housing blocks with services inside) become community conventions.
  • Coverage gaps produce local fires and collapses that spread.
  • Road changes can suddenly strand houses by changing walker routes.

open questions

  • Would walkers with learned or goal-driven routes make coverage more legible or less?

appears in

the paper, 2 sections
paper

4. A grammar of simulation games

linked in this section of the paper

paper
paper

5. The structure of the design space

linked in this section of the paper

paper
glossary

Glossary of mechanics

listed under logistics & networks, with its summary

book

relations

2 stored edges

sources

2
Wikipedia contributors (2026). Caesar III. Wikipedia

provenance

runs in log/runs
2026-10-24
created2026-10-24-taxonomy-m1taxonomy
2026-10-24
reviewed2026-10-24-review-fixesmaintenance