Island Progression Chart
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In most cases completing unlocks from previous ranks is required. For example, completing Cozy Cabin II is required for Cozy Cabin III.
Additionally, sometimes other structures from the same Rank are required for unlocks, e.g. Cozy Cabin III is required for Cropland III, Pasture III, and their respective automation unlocks.
Aspects listed with an asterisk (*) have additional prerequisites in addition to the Rank requirement, usually the completion of a vision or quest.
Aspects shown in italics are features which become unlocked but do not require specific crafting or resource expenditure.