Collection goals

The game defines named sets of collectibles (items, fish, insects, fossils, species, recipes) and tracks which members the player has obtained, donated, or observed. State owned: per set, a membership checklist and completion state. Update rule: when the player acquires or submits a qualifying item, mark it; when a set is complete, grant a reward or unlock. Collection drives engagement with other systems because members are spread across seasons, locations, and rarities. Canonical forms: Stardew Valley's Community Center, with six rooms and thirty bundles whose rewards repair the quarry bridge, greenhouse, minecarts, and bus, Animal Crossing: New Horizons' museum and Critterpedia, and Viva Pinata's species journal with per-species visit, resident, and romance requirements.

A gentle, open checklist. The player plans around a missing fish that appears only in rain in autumn, feels a click when a set completes, and has a reason to explore every corner of the simulation.

• set size and rarity distribution of members
• seasonal, weather, or location gating of members
• reward type: functional unlocks, cosmetics, or none
• fixed versus randomized set contents, such as Stardew Valley remixed bundles
• whether items are consumed by submission
• visibility of missing members as silhouettes or hints

• The last few rare members take far longer than the rest, turning completion into a grind.
• Members missable for a season or year punish players who fall behind.
• Functional rewards locked behind collection force players who dislike collecting through it.

• Collection targets route player attention through seasons, weather, and locations they would otherwise skip.
• Players share calendars and spreadsheets of where and when members appear.
• Alternative completion routes, such as the Joja membership in Stardew Valley, frame collection as a moral choice.

• Can generated collectible sets tied to world state, such as species that evolved in this run, keep collection goals meaningful in procedural worlds?
• What rarity curve keeps the final members exciting rather than grinding?