Guess the size

Think fast. Size it right.

Three lives. Twenty seconds per round. Score at least 60 points to keep a life. How many comparisons can your sense of scale survive?

The world is waiting.

Preparing your size challenge…

The survival rules

The clock starts when a round appears. An estimate below 60 points or a timeout costs one life. The reveal pauses between rounds, so you can read the measurement before continuing. Changing tabs does not pause a running timer.

Get a sense of scale.

  1. Find your reference.The forest-green shape has a known measurement. Check the height, length or diameter label.
  2. Resize your guess.Use the slider, the − / + buttons, or drag sideways on the board. Arrow keys adjust the slider.
  3. Lock it in.The teal outline reveals the recorded true size. Earn up to 100 points per round; five rounds make 500.

Your perspective.

Play a set to start your personal history.

Share a perspective.

Copy this text and link to send your challenge.

Clear your progress?

This removes SizeGuess scores, saved rounds and streaks from this browser.