What makes Approx different
In a standard quiz an answer is right or wrong. In Approx you aim to get as close as possible, with a layer of strategy: how wide your range should be.
A narrow range that contains the answer scores best. A wide range is safer but worth less. A range that misses scores nothing. Each round is a small trade-off between precision and confidence.
Examples of the questions
How tall is the Eiffel Tower in metres? In which year was the telephone patented? You may not know either exactly, but you can rule out most of the possible numbers.
Questions come from 22 categories, including geography, history, astronomy, sport and food, at several difficulty levels.
Play alone or against others
Single-player campaigns let you practise against bots, level by level. The daily challenge gives everyone the same set of questions and a leaderboard. Custom games let you play live against friends or anyone browsing public games.
Getting better at estimating
Good estimators anchor on something they know and adjust from there: a building with 100 floors is roughly 300 to 400 metres tall. The Fermi questions guide shows how to practise it.