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Geography
US States ↔ Capitals
State and capital recognition in either direction.
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Region
ISO 3166-1International standard for country codes used across systems and organizations.
ALPHA-2 · 2 LETTERSRecommended by ISO as the general-purpose country code. Example: United States = US.
ALPHA-3 · 3 LETTERSUsually more closely related to the country name. Example: United States = USA.
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Thirty-six decks are complete: all 13 Geography decks, all nine Words & Language decks, six Science decks, four Codes & Numbers decks, plus four Time decks: Months ↔ Number of Days, Months ↔ Order, Time Units ↔ Equivalents, and Years ↔ Centuries.