Size It Up, a Daily Game of Scale

Field notes

The game uses a known reference object as the sole scale clue, then scores the player's silhouette against the true measurement using ratio rather than absolute error. Its library contains 335 objects across animals, vehicles, space, and geography, with the page attributing measurements to sources including encyclopedia entries, manufacturer specifications, and space-agency fact sheets. Five rounds can earn up to 500 points, and browser-held streak history requires no account.