Observed arrival · 2026-09-17
Guesscale Turns Fermi Estimates Into a Daily Game
A three-question game that trains people to estimate difficult quantities and understand how far their intuition misses.
Field notes
The game asks players to estimate quantities that are difficult to know exactly, then compares each answer with a reference value using multiplicative distance. Its explanatory material emphasizes decomposing problems into assumptions and checking orders of magnitude rather than recalling trivia. The site includes worked examples about the Earth–Sun distance, internet use in 2025, and daily lightning flashes, plus unlimited practice and a browser-local Scale Profile that records directional error.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue