Size Duel
Daily duels, ten a day
269 things from an electron to the Sun: lengths, heights, mountain heights and masses.
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Decks
Four decks, each with its own daily round, endless streak, practice by category and archive. Streaks are kept per deck.
Older Than
Daily duels, ten a day
350 inventions, buildings, books, places and events. Which came first?
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Population Duel
First daily on 25 October 2026
194 countries, World Bank estimates for 2025. Which has more people?
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Further North?
First daily on 25 October 2026
382 cities around the world. Which one lies further north?
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