Resize the silhouette · lock it in · red reveals the true size — 5 rounds a day, free, no account
You can recognize a blue whale, a giraffe or the Eiffel Tower in a second — but almost nobody can say how big they actually are. Recognizing something and knowing its size are two different skills; the gap between them is where this game starts.
In September 2026 a browser-game team known for daily puzzles turned it into a real format: every day, players around the world get the same size comparisons, drawn as silhouettes instead of photos — handing the sense of scale back to each player's own eyes. This site is an independent re-implementation of that format: the rules are public, the data traceable, and the silhouette library and scoring are our own.
It belongs to the daily-puzzle lineage. Since Wordle made “the same puzzle for everyone, one per day” the default of browser games in 2021, the idea has spread — Worldle for country outlines, GeoGuessr for places, Higher or Lower for prices. Size It Up swaps “guess the name” for “guess the scale”: you don't need to know how many floors 27 metres is, you just need to make two silhouettes look right.
No numbers, no typing — just make the two silhouettes look right. Your eyes are better at sizes than you think.
The black silhouette on the left is drawn at its true size, with a scale line marking its length or height. Everything is judged against it.
Drag and resize the white silhouette until the proportion feels right. Way off? Zoom out and start again.
Hit lock, and the true size snaps into place as a red outline over your guess — with your error percentage and a fact worth remembering.
Each round compares a single dimension — length, height or diameter — marked by the measurement line on the board. A giraffe is compared by height, a blue whale by length; when a long silhouette and a tall one sit side by side, don't let the overall look fool you — you're answering the question the line asks.
Three habits make the next round more fun: guess the ratio before the numbers — is it half the reference, twice it, or ten times? Watch the measurement line, and move the target if the composition tricks you. After locking, spend five seconds on the red overlay and remember one specific correction — knowing how you were wrong beats knowing that you were.
Each round pairs two silhouettes: one is the reference, the other the target — the same object can play either role on different days.
The library currently ships with 8 verified silhouettes — blue whale, giraffe, T. rex, saltwater crocodile, Eiffel Tower, Statue of Liberty, bicycle and human — and keeps growing. Every size is an approximate adult or standard dimension taken from published data (encyclopedia entries, official spec sheets); the silhouettes are openly licensed artwork from Wikimedia Commons, credited in-game.
A size describes one specific individual or definition — an adult giraffe, the Eiffel Tower with its antenna. That's why the one-line context on each answer is part of the answer itself: 27 m is a blue whale, not a bus.
All free, no account — the browser is the whole game.
Every player on Earth gets the same five rounds today; a fresh set starts at your local midnight. Come back daily to grow your streak.
Play today's puzzle →No daily cap. Random pairs from the whole library — animals, dinosaurs, vehicles, buildings, planets… practice as long as you like.
Only the animal kingdom: blue whale, giraffe, T. rex, saltwater crocodile… Photos lie, silhouettes don't.
Countries, US states and lakes as silhouettes: is Japan longer than New Zealand? Is Texas bigger than France?
Daily mode is a fixed 5 rounds, max 500 points. Finish all five to keep your streak alive; miss a day and it restarts at one.
Progress and streaks live in your browser's local storage: switching browsers or clearing site data resets your history. Staying in one browser is the only way to keep a streak.
Puzzles come from a deterministic seed of date + library, so refreshing the page changes nothing — only a new day brings a new set. Today's set belongs to today.
You know these objects — but you've rarely stood next to one. Bars are drawn to true scale.