Wormillion

Wormillion is a browser game by Michael Boujikian, who also made the daily country game Shrimply. Its idea is the reverse of most quizzes: a correct answer everyone would give is worth little, and a correct answer few people know is worth a lot.

A run has ten rounds of thirty seconds. Each round gives a prompt, such as "Name a country", and you type any real place that fits. Obscurity is measured by monthly Wikipedia views, so the Nile, with tens of thousands, barely moves the worm, while a little-known place sends it down through the soil layers. Wrong or unknown answers cost nothing, so you can keep guessing until the clock runs out, but you cannot repeat a place within a run, and skipping a round scores nothing.

Today's dig is numbered and gives the same ten prompts to every player; once you finish, a countdown shows when the next one starts. After a dive you see your finds ranked from least to most obscure, and a review shows the rarest answer each prompt would have taken. Endless mode deals fresh prompts as often as you like, and Past dives keeps your daily streak and averages. The game's bank holds over 32,000 real places.

It suits players who know their maps beyond the capitals and like the gamble of reaching for an answer that might not count.