Toys made of real physics.
Swing, pour, pop and celebrate in 3D. Everything here moves by the real rules of nature, and each toy comes with a friendly explanation of why.
Free. No sign-up. Works on phones, tablets and computers.
Pop a bubble to grow a flower
Today’s pick
Newton’s Cradle
Pull back steel balls, let go and feel momentum ripple down the row.
Play now-
Bubble Sheet PoppingSqueeze, pop and swipe endless sheets of 3D packing bubbles. -
Domino RallyLay wooden dominoes on the floor, tip the first and hear the run fall. -
Wave Pool and Rubber DucksSplash the water to herd bobbing rubber ducks into the striped ring. -
Party Balloon PopSqueeze floating helium balloons until they pop, round after round. -
Wax Motion LampDrag glowing wax blobs, merge them and tune the bulb of a motion lamp. -
Zen Sand GardenRake calm grooves into fine sand around mossy stones. -
Basketball Free ThrowsShoot free throws on a park court and find the arc that drops in. -
Office Paper TossToss crumpled paper into the bin while a desk fan blows it off course.
Festivals
See all 31 festivalsLight diyas, float lanterns and fill the sky. Celebrations from around the world.
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Diwali LightsLight diyas around a rangoli, wave a sparkler and fill the sky. -
Loy Krathong River of LightsFloat candlelit krathongs on a moonlit river and watch them drift. -
New Year FireworksCount down to midnight and fill a harbour sky with fireworks. -
Lunar New Year FireworksLight firecrackers and fill the sky with red and gold fireworks. -
Sky Lantern FestivalHold a glowing paper lantern until it tugs, then let it rise. -
Ramadan LanternsLight fanous lanterns in an old lane and swing their star patterns. -
Kite Festival (Makar Sankranti)Fly a patang over sunny rooftops among dozens of kites. -
Holi Colour SplashThrow clouds of gulal and splash white walls with colour.
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Newton’s CradlePull back steel balls, let go and feel momentum ripple down the row. -
Double Pendulum ChaosPose a double pendulum, drop it and see a twin 0.001° away split off. -
Pendulum WavePull back fifteen pendulums, let go and spot snakes, rows and order. -
Metronome SynchronisationStart five metronomes out of step and hear them settle on one beat. -
Ripple Tank InterferenceSet two dippers rippling and find the lines where the waves cancel. -
Chladni Plate Sand PatternsBow a metal plate and watch sand gather into the patterns of sound. -
Trebuchet EngineerTune an oak trebuchet by hand, then pull the trigger and let fly. -
Pendulum Clock EscapementSwing a brass pendulum, wind the weight and regulate a real clock.
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Elephant ToothpastePour a catalyst into peroxide and send a fountain of foam skyward. -
Red Cabbage pH RainbowPour household liquids into cabbage juice and make a pH rainbow. -
Flame Test ColoursHold metal salts in a Bunsen flame and read their spectral lines. -
Soda GeyserDrop mints into a cola bottle and launch a foaming fountain. -
Iodine Clock ReactionPour solution B into four beakers and see them snap to blue-black. -
Hot Ice: Instant CrystalsPour hot ice onto a seed crystal and build a warm crystal tower. -
Buckyball (C₆₀)Pluck a C₆₀ carbon to ring the cage, then count its 12 pentagons. -
DNA Double HelixPull DNA’s strands apart, swap base pairs and heat it until it melts.
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Koi PondFeed koi in a Japanese garden: tap the water and they rise to gulp. -
Starling MurmurationFly a falcon at a swirling flock of starlings over a sunset roost. -
Synchronous FirefliesFlash your light at hundreds of fireflies and pull them into step. -
Geese in V FormationSlide geese into each other’s upwash and send them to the front. -
Fish School and SharkSteer a shark into a sardine school and see the fish part around it. -
Jellyfish BloomStartle and push pulsing jellyfish, and make a crystal jelly glow. -
Humpback Whale Bubble-Net FeedingSwim a humpback round a herring school and trap it in bubbles. -
Coral Reef AquariumFeed reef fish, visit the clownfish and see how heat bleaches corals.
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Solar System in MotionDrag planets onto new orbits and fling new worlds on real gravity. -
Galaxy CollisionAim two spiral galaxies at each other and pull out tidal tails. -
The Three-Body ProblemNudge three stars on one gravity: from a figure-eight to pure chaos. -
Gravity SlingshotLaunch a probe past a giant planet and steal a little of its speed. -
Black Hole Accretion DiskFeed a black hole and watch its glowing disc swirl into the dark. -
Perseid Meteor ShowerCatch Perseid meteors as they streak and trace them back to Perseus. -
Binary Star DanceDrag two stars into new orbits and fling in a planet with two suns. -
Kepler’s Laws: A Comet’s OrbitDrag a comet onto new orbits and see Kepler’s three laws at work.
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Lorenz AttractorDrop probe clouds into the butterfly of chaos and watch them part. -
The Butterfly EffectStart two twins a millionth apart and see how soon they part ways. -
Mandelbulb Fractal FlightDive into a bronze Mandelbulb, a 3D cousin of the Mandelbrot set. -
Sunflower Golden AngleChange the angle between seeds and see why sunflowers use 137.5°. -
L-System BonsaiPrune, water and bend a bonsai grown from a few rewriting rules. -
Turing PatternsPaint on a fish’s skin and watch spots and stripes form by themselves. -
Rössler AttractorPull one lever: one loop doubles, doubles again, then turns to chaos. -
Aizawa AttractorDrop probes on a glowing shell and watch them shoot up its core.
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Rain on a PondTap raindrops onto a garden pond, fling pebbles and trail a finger. -
Weather Balloon to the Edge of SpaceFill a weather balloon, let it go and see it swell until it bursts. -
Tornado VortexSteer a twister over farmland and lower its cloud base to touch down. -
Lightning StormCall down lightning and count the seconds until the thunder arrives. -
Aurora BorealisStir up the northern lights over a frozen lake and set off substorms. -
Rainbow MakerAim a garden hose, move the sun and find the rainbow’s 42° circle. -
Volcano EruptionPump magma into an island volcano and open vents on its slopes. -
Ocean Waves and LighthouseSweep up a wind round a lighthouse and see long waves outrun short.
Why it feels good to play here
Real rules, real feel.Balls, bubbles and sparks move the way physics says they should, so what you feel under your finger matches the world.
No pressure.No timers, no lives, no accounts. Just gentle sound you can switch off and toys that wait patiently for you.
Learn by accident.Every experience has a short, plain-language explanation of the science, with the equations for anyone who wants them.
Your progress stays with you.We don’t ask for your name. The list of toys you have played is stored only on your own device.