How it works
How the sizes are measured
Where every size in the game comes from, what exactly is measured, how ranges and maximums work, and how each guess is scored.
One named measurement per object
Every object has one measurement that the question names: height, length, diameter, width or wingspan. A building’s height follows a stated rule (for example with or without its antenna), an animal’s size says whether it is a maximum or a range, and a vehicle names its model. Two objects are always compared on the same scale, even when their measurements run in different directions.
Where the numbers come from
We use the organisation responsible for the object wherever possible: space agencies, museums, zoos, government agencies, sports governing bodies and manufacturers. When an official figure is not available we use a recognised reference work such as Encyclopaedia Britannica and label it as a reference source. After every answer, “Source & measurement” links to the page that was used and says when it was checked.
Ranges and maximums
Living things vary, so some answers are ranges or published maximums. If a source gives a range, any guess inside it earns full marks and the result shows both boundaries rather than inventing one exact size. A maximum is labelled “up to” and is not presented as an average.
Silhouettes
Each silhouette is scaled so its named measurement is exact. Other proportions are illustrative: simplified drawings of our own, or licensed silhouettes credited under “Artwork credit”. We never read a real size off a drawing’s pixels.
Scoring
Each round earns up to 100 points: divide the smaller of your guess and the answer by the larger, multiply by 100 and round. From October 5, 2026, a guess within 5% of the answer earns the full 100; earlier dailies keep the rule they were played with. Half or twice the real size earns 50. Five rounds make a total out of 500.
Corrections
If you think a size or drawing is wrong, email us with the comparison you saw and a source. Published daily challenges are never changed after release; corrections apply to future rounds.