Endless rounds, no daily cap
Unlimited mode is the size comparison game without a finish line. The daily puzzle gives everyone the same five rounds once a day; here you get a fresh comparison every time you press Next, for as long as you feel like playing. There is no countdown, no lock after the fifth round and no account to create. Open the page, resize the orange silhouette, lock in, and the next pairing is ready.
It is the same engine as the daily challenge. A familiar reference is drawn to scale in blue with its real measurement, the object you are estimating appears in orange at the wrong scale, and you stretch or shrink it until the two look right together. The live readout in the corner shows the size you are proposing while you adjust, and the reveal shows the true size, how far off you were and where the number comes from.
If you came here looking for an unlimited version of daily size games such as Size It Up, this mode is our answer: an independent practice ground with its own pictures, measurements and sources.
How unlimited play differs from the daily puzzle
- Random pairings. Each round picks an object and a matching reference at random. Two people playing at the same time will see different comparisons.
- No streaks on the line. Your daily streak and statistics only count the daily puzzle, so you can experiment freely here without worrying about a bad round.
- Categories. Play everything mixed together, or filter the rounds to animals, space, everyday things or famous landmarks.
- Session stats. The counters above the game track how many rounds you have played, your average score and your current run of 90-plus rounds.
Choose a category
Animals
Whales, sharks, crocodiles, bears, birds and dinosaurs. Animal rounds are where intuition fails most often, because we usually see these creatures alone in a frame rather than next to a car or a person. Expect questions such as how long a great white shark is next to a giraffe, or how a capybara compares with a standard door.
Space
Planets, moons, dwarf planets and the Sun, always compared with another space object so that both fit on screen. These rounds involve the biggest ratios in the game, from Pluto next to the Moon up to the Sun next to Jupiter, so they are a great way to train your feel for large multiples.
Things
Everyday objects, vehicles and people: buses, cars, planes, ships, doors, phones, balls and more. These are the references you know best, which makes it all the more surprising when a guess is off by 30% or more.
Landmarks
Towers, skyscrapers, monuments and one very tall mountain. Is the Leaning Tower of Pisa taller than the Colosseum? How many Eiffel Towers stack up to Burj Khalifa? Landmark rounds compare famous structures with each other and with big ships and aircraft, so the numbers climb into the hundreds of meters.
Practise your size comparisons with a plan
You can simply keep hitting Next, but a little structure makes unlimited play a genuinely good way to sharpen your sense of scale.
- Warm up with Things. Start with everyday objects, where you already have a rough idea of the real numbers. Focus on matching the picture first and only then glance at the live readout.
- Move on to Animals. Once you are averaging 80 or more, switch to animals and try to beat that average. Pay attention to whether the question asks for length or height.
- Finish with Space. Planet rounds reward thinking in multiples: Jupiter is about eleven Earths wide, Earth is a little under four Moons wide. Try to hold those anchors in your head.
- Chase a streak. The 90+ counter resets whenever a round scores below 90. Getting it to five or more takes real consistency.
Scoring in unlimited mode
Scoring works exactly like the daily puzzle. Each round is worth up to 100 points. A guess within 5% of the true size earns full marks, and the score falls gradually as the error grows, reaching zero once you are off by three times or more. Over- and under-estimates are treated the same way: guessing double the real size costs as much as guessing half.
Because rounds are random, your average is the number to watch. A session average above 70 is solid; above 85 means you have a genuinely good eye for proportions. The full breakdown is on the how to play page.
Why play an endless size comparison game?
A single daily puzzle is a nice ritual, but five rounds is not much data. Playing many rounds in a row shows you patterns in your own guesses. You might find that you consistently undersize large animals, or oversize small objects. Seeing the grey shadow of your guess next to the true size, round after round, is the fastest way to notice and correct those habits.
Unlimited play is also a good way to learn the references themselves. After a few dozen rounds you will know without looking that a school bus is about 12 meters long and a standard door just over 2 meters tall, and those anchors make every later guess easier.
It is also simply relaxing. There is no timer, nothing to lose, and every round ends with a small fact about the object you just measured. Plenty of players use unlimited mode as a quick break: three or four rounds, a couple of surprises, then back to work.
Questions about unlimited mode
Do unlimited rounds affect my daily streak?
No. Streaks, averages and the score distribution only count the daily puzzle. Unlimited mode keeps its own counters for the current session.
Will I see the same object twice?
Every object in the selected category comes up once before any of them repeat, and the reference it is paired with changes from round to round. As we add new objects, the pool keeps growing.
Is the unlimited size comparison game free?
Completely free: it is an online size comparison game that runs in your browser on desktop or mobile, with nothing to download.
Can I play in feet and inches?
Yes. Use the m / ft switch at the top of the page; your choice is remembered on this device.
How is this different from the daily puzzle?
The daily size comparison game is shared by everyone and can be played once a day for a shareable score. Unlimited mode is random, private and endless – the place to practise.