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simgrammar the grammar of simulation

core loop

visit the island each real day -> gather wood, fruit, fish, bugs, and fossils -> craft D.I.Y. items and spend Bells and Nook Miles -> donate to the museum and decorate -> island rating rises and unlocks services -> new seasons bring new species

design notes

Time runs on the console clock, and weather, seasons, and species availability follow the hemisphere chosen at start, so a missed month means missing that month's fish and bugs. The developers lowered bank interest and removed waits from landscaping and crafting to reduce the payoff of changing the console clock. The island's one-to-five-star rating gates milestones such as K.K. Slider's concert at three stars, after which the Island Designer lets players add and remove cliffs, water, and paths. The turnip stalk market sells turnips on Sunday mornings, changes buy prices twice daily under one of four weekly patterns, and spoils unsold turnips the next Sunday.

relations

13 stored edges
uses

Collection goals

Blathers' museum collects fish, bugs, sea creatures, fossils, and art donated by the player.

core
uses

Building placement

Furniture and items can be placed indoors and outdoors anywhere on the island, and the player chooses sites for residents' houses and shops.

core
uses

Hand crafting

D.I.Y. recipes turn gathered wood, stone, iron, fruit, and other materials into tools, furniture, and decorations at a workbench.

core
uses

Real-time clock

Game time follows the console clock; days, hemisphere-based seasons, shop hours, and species spawn windows advance while the game is off.

core
uses

Decoration and beauty

The island rating (one to five stars) reflects development and scenery; three stars triggers K.K. Slider's concert.

supporting
uses
supporting
uses

Milestone unlocks

Island growth brings shopkeepers and services such as Nook's Cranny, the museum, and the Able Sisters.

supporting
uses

Relationship values

Villagers' friendship with the player grows through conversation and gifts.

supporting
uses

Renewable regrowth

Rocks, fruit, fish, and bugs replenish on daily or multi-day cycles, so gathering is a daily routine.

supporting
uses
supporting
uses

Spoilage

Turnips bought on Sunday rot the following Sunday while sell prices follow one of four weekly patterns.

supporting
uses

Terraforming

The Island Designer edits cliffs, rivers and ponds, and paths.

supporting
uses
supporting

backlinks

computed from other records

sources

2
Wikipedia contributors (2026). Animal Crossing: New Horizons. Wikipedia
Nookipedia contributors (2026). Stalk Market. Nookipedia

provenance

runs in log/runs
2026-10-24
created2026-10-24-catalog-gccatalog