Grade 3 Science Games
These 120 free science games for grade 3 let kids predict what will happen, watch it play out and see why. They cover forces & motion, matter, electricity, magnets, light, sound, heat, earth & space, life science, human body, energy, weather, ecosystems, space & astronomy, plant science, geology, cells & microbiology, health & the body, environment & climate, oceans & marine life, extreme weather & sky, space exploration, genetics & heredity, evolution & classification, making electricity, motion & forces, waves & vibrations, animal kingdom, light & optics, chemistry lab, body systems, plate tectonics, science skills and run in the browser with no sign-up and no ads.
Each game shows the grade band it is written for, so you can pick the ones that fit your child.
Forces & Motion
- Which Falls Faster?Grades 3–5Predict which lands first — a heavy object or a light one — then watch them fall together.
- Penny & FeatherGrades 3–5In air the feather flutters; pump the air out and it falls as fast as the penny.
- Friction RampGrades 3–5Predict which surface a block slides farthest on — ice, wood or carpet.
- Balanced ForcesGrades 3–5Predict a tug-of-war — equal forces balance and nothing moves; the stronger side wins.
Matter
- States of MatterGrades 2–4Predict what happens when you heat ice or cool water — solid, liquid and gas, transformed.
- Can You Undo It?Grades 2–4Predict whether a change can be reversed — melting can; burning makes something new.
- DissolvingGrades 2–5Predict what makes sugar dissolve faster — and that it does not vanish, just spreads out.
Electricity
Magnets
- Magnet PolesGrades 2–4Predict whether two magnets snap together or push apart — opposite poles attract, like poles repel.
- What Sticks to a Magnet?Grades 2–4Predict whether a magnet picks it up — iron and steel yes, but not aluminium, copper, wood or plastic.
- Magnet DefenseGrades 3–5Fire your tower's N or S pole to push falling magnet-meteors away and pull supply pods in — like poles repel, opposites attract, and only iron and steel stick.
Light
- ShadowsGrades 1–3Predict what a shadow does — move the lamp closer and it grows, because light travels straight.
- Can You See It?Grades 1–3Predict whether you can see in the dark — you only see when light bounces off a thing into your eyes.
- See Through It?Grades 1–3Predict whether light passes through — clear, blurry or blocked — and what shadow it casts.
Sound
Heat
Earth & Space
- Day & NightGrades 1–4Predict what makes day and night — the Earth spins, the Sun stays put.
- The Water CycleGrades 2–5Predict where a puddle goes — it evaporates, forms clouds, and falls as rain.
- The Solar SystemGrades 3–5Predict planet order and size — eight orbit the Sun (a star, not a planet); Jupiter is biggest.
- Water Cycle SnakeGrades 3–5Steer a water-drop snake to eat the stage that comes next — evaporate, condense, precipitate, collect — or the melt, freeze and heat change that turns ice into vapor, as its body traces the drop's journey.
Life Science
- What Plants NeedGrades 1–3Predict what happens — with light and water a plant thrives; take one away and it wilts.
- Life CyclesGrades 2–4Predict the next stage — a caterpillar becomes a chrysalis, then a butterfly.
- CamouflageGrades 2–4Predict which animal is hidden — colors and patterns that match the surroundings help animals hide.
Human Body
- The Five SensesGrades 1–3Predict which body part senses what — eyes see, ears hear, nose smells, tongue tastes, skin feels.
- TeethGrades 1–4Predict which tooth does which job — sharp incisors cut, pointy canines tear, flat molars grind.
- The SkeletonGrades 1–4Predict what bones do — they hold you up and shield soft organs: the skull guards the brain, ribs the heart.
- BreathingGrades 2–5Predict what breathing does — take in oxygen, breathe out carbon dioxide; the lungs puff up and shrink.
- MusclesGrades 3–6Predict how a muscle moves you — muscles can only pull, never push, so they work in opposing pairs.
- DigestionGrades 3–6Predict food’s journey — mouth to stomach to intestines, where nutrients soak into the blood.
- Heart & BloodGrades 3–6Predict how blood moves — the heart pumps it around a loop, out with oxygen and back to refill.
- Brain & NervesGrades 3–6Predict how your body sends messages — the brain is in charge, with nerve signals to move and feel.
Energy
Weather
- Cloud TypesGrades 2–5Predict the cloud and its weather — puffy, flat, wispy or towering, each signals fair or stormy skies.
- Rain, Snow & HailGrades 2–5Predict what falls — the temperature of the air decides rain, snow, sleet or hail.
- What Makes WindGrades 3–6Predict which way the wind blows — warm air rises and cooler air rushes in to take its place.
- Reading a ThermometerGrades 1–4Predict warmer or cooler — read the thermometer and tell what to expect or wear.
Ecosystems
- Animal HabitatsGrades 1–4Predict where an animal belongs — each lives where its needs for food, water and shelter are met.
- DecomposersGrades 3–6Predict nature’s recyclers — fungi, worms and bacteria break down dead matter and feed the soil.
- PollinationGrades 2–5Predict the pollinator’s work — carrying pollen flower to flower so plants can make seeds and fruit.
- Producers & ConsumersGrades 3–6Predict who makes food and who eats it — plants produce, animals consume, energy flows from the Sun.
- Food Chain CrossingGrades 1–3Play Frogger as a rabbit, caterpillar, mouse or fox — hop across lanes of animals only when the one in your path doesn't eat you, because who is dangerous depends on where you sit in the food chain.
Space & Astronomy
Plant Science
- Plant PartsGrades 1–4Predict each part’s job — roots drink, the stem carries, leaves catch sunlight, the flower makes seeds.
- Plant Parts We EatGrades 2–5Predict which part you eat — a carrot is a root, celery a stem, broccoli a flower, an apple a fruit.
- Seed DispersalGrades 2–5Predict how a seed travels — on the wind, by water, hitching on an animal, or popping out.
- GerminationGrades 1–4Predict what a seed needs to sprout — water and warmth; the root heads down, the shoot up.
- Roots & WaterGrades 2–5Predict which way water moves — up from the roots, through the stem, out to the leaves.
- Growing Toward LightGrades 3–6Predict which way a plant bends — shoots grow toward the light, roots grow down.
Geology
- Rock TypesGrades 3–6Predict the family — igneous from cooled magma, sedimentary from pressed layers, metamorphic from heat and pressure.
- Soil LayersGrades 2–5Predict the order — leaf litter and topsoil above, subsoil, broken rock, then solid bedrock.
- How Fossils FormGrades 2–5Predict the steps — buried in sediment, hard parts slowly turn to stone over a very long time.
Cells & Microbiology
- What Is a Cell?Grades 3–6Predict what counts as living — all living things are built from tiny cells too small to see.
- BacteriaGrades 3–6Predict helpful or harmful — tiny single-celled bacteria live everywhere and split to multiply.
- MicroscopesGrades 2–5Predict what needs magnifying — a microscope reveals cells and germs too small for the eye.
Health & the Body
- Immune SystemGrades 3–6Predict how the body fights germs — skin blocks them and white blood cells attack invaders.
- Food GroupsGrades 1–4Predict a balanced plate — fruits, veggies, grains, protein and dairy each do a job.
- Germs & HygieneGrades 1–4Predict how germs spread and what stops them — washing hands with soap breaks the chain.
- Exercise & FitnessGrades 1–4Predict what exercise does — a faster heart, harder breathing, and stronger muscles.
- Why We SleepGrades 1–4Predict what sleep does — the brain sorts memories and the body grows and repairs overnight.
- Vitamins & MineralsGrades 2–5Predict the nutrient — vitamin A for eyes, C to fight colds, calcium for bones, iron for blood.
- White CellGrades 2–4Steer a white blood cell through a blood vessel and engulf the germs and virus-infected cells before they multiply, while leaving your own red cells, platelets and healthy cells alone.
Environment & Climate
- RecyclingGrades 1–4Predict the right bin — recycle, compost or trash — and what a recycled item becomes.
- PollutionGrades 2–5Predict the type — air, water or land — and how to clean it up and keep it clean.
- ConservationGrades 2–5Predict waste or save — small actions save water, energy and materials we can’t replace.
- Reduce, Reuse, RecycleGrades 1–4Predict the best R — reducing and reusing beat recycling; put the three in order.
- Recycling RushGrades 2–4Hop between four conveyor belts and slide each item to the bin for what it is made of — paper, plastic, metal, glass or compost — before it reaches the landfill.
Oceans & Marine Life
- Ocean ZonesGrades 3–6Predict the zone — light fades and pressure grows from the sunlit top to the midnight deep.
- Coral ReefsGrades 2–5Predict what coral is — a tiny animal whose reef is a crowded underwater city.
- Marine Food WebsGrades 3–6Predict the ocean ripple — energy starts with plankton; remove one link and others shift.
- Ocean WavesGrades 2–5Predict what makes waves — wind builds them, but the water mostly bobs in place.
- The Deep SeaGrades 3–6Predict the dark, cold, high-pressure deep — and the strange creatures adapted to survive it.
Extreme Weather & Sky
- HurricanesGrades 3–6Predict how a hurricane forms and spins — a giant storm with a calm eye over warm seas.
- TornadoesGrades 3–6Predict the funnel — a fast spinning column of air that drops from a thunderstorm.
- Thunderstorms & LightningGrades 2–5Predict the flash then the boom — light outruns sound, so count the gap to find the distance.
- FloodsGrades 2–5Predict the cause and the safe move — too much water covers low land; head for higher ground.
- DroughtsGrades 3–6Predict the long dry spell — rivers drop and crops wilt when the rain stays away.
Space Exploration
- RocketsGrades 2–5Predict how a rocket flies — it pushes hot gas down, so it shoots up, and must go very fast.
- The Space StationGrades 3–6Predict life in orbit — everything floats because the station is always falling around Earth.
- Mars RoversGrades 3–6Predict a rover’s job — a robot drives, drills and tests Mars where it’s too risky for people.
- TelescopesGrades 3–6Predict what a telescope does — it gathers light so faint, faraway things look big and bright.
- The Moon LandingGrades 2–5Predict what the Moon is like — astronauts bounced in low gravity and left lasting footprints.
Genetics & Heredity
Evolution & Classification
- Adaptation Over TimeGrades 3–6Predict the fit — over many generations, species develop features that suit their home.
- Animal ClassificationGrades 3–6Predict the group — fur and milk mean mammal, feathers mean bird, scales and gills mean fish.
- What Is a Species?Grades 3–6Predict same species or not — a group that can breed and have young like themselves.
- ExtinctionGrades 3–6Predict extinct or endangered — gone forever, versus just a few left but hanging on.
Making Electricity
- Solar PowerGrades 3–6Predict the output — panels turn sunlight straight into electricity; bright sun makes more.
- Wind PowerGrades 2–5Predict the spin — wind turns the blades to make electricity; stronger wind, more power.
- HydropowerGrades 3–6Predict the flow — falling water spins a turbine; more water or a higher drop makes more.
- BatteriesGrades 3–6Predict the charge — a battery stores chemical energy and releases it as electricity.
Motion & Forces
Waves & Vibrations
- What Is a Wave?Grades 3–6Predict what counts as a wave — a traveling disturbance that carries energy, not matter.
- How Ears HearGrades 3–6Predict the path — sound waves vibrate the eardrum, then signals travel to the brain.
- Waves Carry EnergyGrades 3–6Predict what moves — a wave carries energy from place to place, while the matter bobs in place.
Animal Kingdom
- Vertebrates & InvertebratesGrades 3–6Predict backbone or not — a dog has a spine; an insect or jellyfish does not.
- Insect MetamorphosisGrades 2–5Predict the stage — egg to caterpillar to chrysalis to butterfly, a full-body change.
- Animal MigrationGrades 2–5Predict the journey — animals travel with the seasons to find food, warmth and a place to raise young.
- HibernationGrades 1–4Predict the big sleep — some animals slow right down through winter to survive the cold.
- Animal SensesGrades 2–5Predict the super-sense — a dog’s nose, an eagle’s eyes, a bat’s echolocation.
- Nocturnal AnimalsGrades 1–4Predict day or night — owls and bats work the night shift with big eyes and sharp hearing.
Light & Optics
- How Eyes SeeGrades 3–6Predict the path — the lens focuses light onto the retina, then the brain makes the picture.
- RainbowsGrades 2–5Predict how it forms — sunlight through raindrops splits into a band of colors.
- How Cameras WorkGrades 3–6Predict the image — a lens focuses light onto a sensor, like a mechanical eye.
Chemistry Lab
Body Systems
- The KidneysGrades 3–6Predict the job — the kidneys filter waste from the blood and make urine.
- Your SkinGrades 2–5Predict skin’s jobs — your largest organ protects you, feels touch, and sweats to cool down.
- ReflexesGrades 3–6Predict reflex or not — automatic, super-fast reactions that protect you without thinking.
Plate Tectonics
Science Skills
- The Scientific MethodGrades 3–6Predict the step — ask, guess a hypothesis, experiment, observe, then conclude.
- Measuring ToolsGrades 2–5Predict the tool — a ruler for length, a scale for mass, a thermometer for temperature.
- Reading GraphsGrades 3–6Predict the value — read bars and lines to answer questions and spot the trend.
Common Questions
What science do kids learn in grade 3?
These 120 grade 3 science games cover Forces & Motion, Matter, Electricity, Magnets, Light, Sound, Heat, Earth & Space, Life Science, Human Body, Energy, Weather, Ecosystems, Space & Astronomy, Plant Science, Geology, Cells & Microbiology, Health & the Body, Environment & Climate, Oceans & Marine Life, Extreme Weather & Sky, Space Exploration, Genetics & Heredity, Evolution & Classification, Making Electricity, Motion & Forces, Waves & Vibrations, Animal Kingdom, Light & Optics, Chemistry Lab, Body Systems, Plate Tectonics and Science Skills. Each game isolates one big idea, such as why a heavy and a light object fall together or what makes a circuit light a bulb.
How do the predict-observe-explain games work?
The child first predicts what will happen, then watches the real thing play out, then reads a short explanation of why. Checking a guess against the result is what corrects common misconceptions, and it takes only a minute or two per round.
Are these grade 3 science games free?
Yes. Every game is free with no ads, no in-app purchases and no sign-up, and runs in any browser on a phone, tablet or computer.
How long should my child play each day?
Ten to fifteen minutes is plenty. One or two games per sitting, ideally followed by a quick chat about what surprised them or a real-life experiment at home, helps the idea stick.
Science Games for Other Grades
Grade 1 · Grade 2 · Grade 4 · Grade 5 · Grade 6 · Grade 7 · Grade 8
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