Population data attribution

Source: The World Bank, World Development Indicators, Population, total (SP.POP.TOTL).
Reference year: 2025. Source last updated: 2026-10-08. Retrieved: 2026-10-18.
Indicator: https://data.worldbank.org/indicator/SP.POP.TOTL
API: https://api.worldbank.org/v2/country/all/indicator/SP.POP.TOTL?date=2025&format=json&per_page=20000
License: Creative Commons Attribution 4.0 International (CC BY 4.0).
https://creativecommons.org/licenses/by/4.0/
World Bank data licensing: https://datacatalog.worldbank.org/public-licenses

Changes: retained unmodified population values for the original 195-country pool
where available, plus Greenland. Vatican City has no value in this source.
The World quiz ranks the original pool and selects the 159 largest available populations,
then adds Greenland as a deliberate exception, giving 160 places in total.
No regional aggregates, dependencies other than Greenland, or additional economies
are included in the World question deck. Continent quizzes use all 195 countries
from the original pool, without applying the population cutoff. Greenland is
included only in the World quiz.
The data snapshot is bundled for offline play.