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

definition

Owns relationship-status edges (crush, lover, fiance, spouse, ex) and family links (parent, child, sibling) plus the rules that move pairs between statuses. Attempts such as flirting, proposals, and breakups succeed with probabilities from attraction, opinion, age, traits, and existing commitments; partnered pairs gain bonuses and can produce children, linking to lifecycle and inheritance. RimWorld pawns over 16 can attempt romance every 12 days; success depends on beauty (Ugly x0.3, Pretty x2.3), relative age, and existing relationships; a rebuff gives -10 and -15 opinion; lover is +35, spouse +30, ex -15, breakup -50, and kin get base opinions such as parent +30. Stardew Valley has 12 marriage candidates courted through a heart-based friendship meter (250 points per heart). Crusader Kings III makes marriage a political act that links dynasties. Inputs: relationship values, traits, ages. Outputs: couples, households, children, grief, jealousy.

player experience

Romance gives characters personal goals and the player a matchmaking game. Players engineer meetings, celebrate weddings, and deal with affairs and breakups; children turn a run into a family saga.

design levers

  • attraction model (traits, beauty, orientation, compatibility) and attempt cooldowns
  • status ladder and requirements for each step
  • jealousy, cheating, and breakup rules
  • whether relationships are player-directed, autonomous, or both
  • fertility and household formation rules that link to lifecycle

failure modes

  • Romance spam: compatible agents pair off immediately and the system stops generating story.
  • Autonomous affairs and breakups wreck carefully built families, which feels like the game punishing the player.
  • Narrow attraction rules repeat the same few pairings every run.
  • Ignoring orientation or consent in autonomous romance produces behavior that players report as harmful.

dynamics

  • Couples anchor households and change migration, mood, and grief networks.
  • Love triangles and rivals produce recurring social conflicts and fights.
  • In dynastic games, marriage creates alliance and inheritance claims across factions.

open questions

  • Can language-model characters carry courtship as dialogue with consistent preferences, and how should that be constrained for safety and consent?
  • What autonomy level for romance maximizes story without making players feel they lost control of their families?

appears in

the paper, 3 sections · 1 chapter · 1 episode
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
paper

8. Where the techniques land

linked in this section of the paper

paper
glossary

Glossary of mechanics

listed under social relations, with its summary

book
ch 8

Chapter 8. Where AI lands

linked from the text

book
ep 3

Families across genres

on screen at 4:12 odd couples

episode

relations

1 stored edges

sources

3
RimWorld Wiki contributors (2026). Social. RimWorld Wiki
Wikipedia contributors (2026). Stardew Valley. Wikipedia
Stardew Valley Wiki contributors (2026). Friendship. Stardew Valley Wiki

provenance

runs in log/runs
2026-10-24
created2026-10-24-taxonomy-m3taxonomy