Size It Up Game: Guess the Real-World Scale

The Size It Up game, at gamesizeitup.com, is a free daily puzzle about how big things are. You are not naming a rare answer. You are resizing a silhouette until it matches a known object at the same scale. The rules below come from that site’s how-to-play, about, and unlimited pages, checked on 14 November 2026. Another site uses the same title, and it is not this one. Details are at the end.

What is the Size It Up game?

Each round shows a green reference at a known height, length, diameter, or map area, and a purple silhouette you resize. The label tells you which dimension matters. A bus is measured along its length. A standing giraffe is measured by its height. Geography questions compare area in square kilometres, and an area is only compared with another area. The how-to-play page says the Geography topic uses dated UN total surface-area values, rounded as each note describes.

There is no stopwatch on the standard game, no account, and no download. Scores stay in the browser. You can share a result that does not spoil the measurements.

The about page calls this an independent browser game and “this edition.” That wording matters, because the name is not unique.

How do you play the Size It Up game?

Picture the green object, then judge how many of it would fit along the purple object’s marked dimension. Resize until the pair looks right, and press Lock in my guess. Each round can be submitted once. The correct silhouette appears in orange next to your purple estimate, with the actual measurement, your error, a short fact, and a link to the source of the measurement.

Controls, from the how-to-play page:

• Mouse: drag the purple corner handle, move the slider, or use the smaller and larger buttons.
• Touch: slider, large plus and minus buttons, or the handle.
• Keyboard: Tab to the slider and use the arrow keys. Home and End jump to the ends of the range. Tab to Lock in and press Enter.
• Board zoom and Fit view change what you see. They do not change your answer.

The slider runs from 0.05× to 20× the reference measurement. Both silhouettes share one scale, and the camera stays still while you resize.

Scoring is a symmetric ratio. A guess twice the real size gets the same points as a guess half the real size. The published formula is score = round(100 × max(0, 1 − |ln(estimate / actual)| / ln(5))). The how-to-play page illustrates it:

The displayed percentage error uses the actual size as the denominator, so it shows direction, while the points treat too-big and too-small the same. Five rounds make a game. A perfect game is 500 points.

Is there an unlimited mode?

Yes. Unlimited starts another five-round game whenever you want. There is no daily attempt limit, no timer, and no sign-up. It draws from the existing library rather than inventing measurements, avoids recent pairs where it can, and does not change your Daily record.

The daily challenge is a shared set of five comparisons for the UTC date. It resets at midnight UTC. Your first completed result is the daily one. Progress can survive a refresh when local storage is available, and completed dailies count toward a streak.

The archive replays any daily challenge the site has published since 25 October 2026. Archive results are practice. They do not replace that first daily score.

Explore holds 3,000 stored comparisons across 208 themes. Map questions there use approximate areas from generalized outlines. The explore page points to a Geography set that uses the statistical areas, and to 20 curated collections with their own best scores. The how-to-play page also publishes Scale Streak, which is a different mode from the five-round resize. It is eight questions and three hearts. Choosing bigger or smaller is worth 100 base points. A precise size estimate, locked in before the reveal, is worth 250 base points if it lands within 20 percent. Two correct answers in a row unlock 2× on later answers, and four unlock 3×. After three correct answers you pick one perk. The page names that perk and does not list the perk options, so this guide does not invent them. A miss costs a heart and normally breaks the combo. Classic scores stay separate.

What helps you estimate better?

Read the dimension before you touch the slider. Height against length is the error the unlimited page warns about. Animals use the representative example in the source note, not every individual of the species. After a reveal, keep that measurement as a new reference and judge the next object as a fraction or a multiple of something you now know.

Zoom out with Fit if a silhouette leaves the board. Then put the estimate back on the slider. A closer camera can make a large object feel small.

This is a different muscle from the rare-answer games. Rarest Answer, Krillion, and Cosmillion ask you to name a member of a category. Size It Up asks whether your eye knows a metre. Both are short daily browser games. Only the first group cares which answer other people would have typed. If you want that, play today’s round or open unlimited mode for extra prompts. The rarest answers pages will not help you resize a dolphin.

Which Size It Up is which?

On 14 November 2026, sizedle.com/size-it-up also presented a daily game titled Size It Up, labeled “a game by Sizedle+,” showing round 1 of 5 and a score out of 500. Its FAQ headings were collapsed, so this page does not borrow a formula from it. sizeitupgame.com was a third game under the same words: its homepage said every day brings 6 rounds, scored out of 600, and you drag an orange silhouette against a known object. That is not the five-round purple-and-green game at gamesizeitup.com, and it is not an archive of that game. Compare scores only with people who played the same domain.

Dartle is the other daily game here that is about numbers rather than rare names: you add category values to 100. Farflung is the one that uses a map, and it scores countries by how unusual they are, not by how large they are. A survey of the whole set is on games like Krillion.

Which pages were checked?

gamesizeitup.com, how to play, unlimited, about, and explore, plus the Sizedle page and sizeitupgame.com linked above, on 14 November 2026.