How big?

How many? ESTIMATION

Drag up or down to guess how many people fit in a real place.

Size It Up ESTIMATION

Size It Up is a daily visual estimation game where you resize one object to match its real-world scale against another. Test your sense of size with everything from animals and landmarks to everyday objects, then see how close you got.

Scale It ESTIMATION

A size guessing game: stretch an object to its real size next to one you know, from coins to the Eiffel Tower. Five pairs a day, plus unlimited play.

Fermi ESTIMATION

A daily estimation puzzle game. You get three questions and one guess each, to land as close to the real answer as possible. You're scored on how close you get, as a multiple.

How wide? GEOGRAPHY

Drag outward to guess how wide a real city is, relative to another city.

Where? GEOGRAPHY

A silhouette, a name, an empty world map: move the map under the crosshair to where the animal lives, then see its real range.

Who? TRIVIA

Guess what the crowd actually answered, from published surveys. Five rounds a day; the reveal shows the crowd's answer beside your guess.

How many? ESTIMATION

Drag up or down to guess how many people fit in a real place.

When? HISTORY

Guess when a real event happened by placing it on a timeline.

How expensive? PRICE

One item, one place, one date: set the price it cost, then see the real price from official price statistics.