Ready when you are
For 11 to 13 year olds. Change
Start here
Then
Ages 7–12
Array Builder
You have 24 tiles. How many different rectangles can you make?
Start playing →Ages 7–12
Lever Lab
The grown-up weighs three times as much. Where can the child sit to balance them?
Start playing →Ages 8–13
Density Tower
Can you stack liquids like a cake?
Start playing →Ages 8–13
Who Eats Whom
Take one animal away. What happens to all the others?
Start playing →Ages 8–13
Place Value Zoom
Multiply by ten. Watch which way the digits move.
Start playing →Ages 8–13
Ramp & Slide
Same sled, same hill. So why does one stop sooner?
Start playing →Ages 11–13
Spring Launcher
How far should you squeeze this spring?
Start playing →Ages 7–12
Kitchen Chemistry
Mix things from the kitchen. Which ones fizz, foam and change colour?
Have a read →Ages 11–13
Temperature Translator
Is zero degrees always cold?
Start playing →Ages 8–13
Cell City
Everything in here has a job. What breaks if you take one out?
Start playing →Ages 7–12
Tile Floor
Cover the floor. No gaps, no overlaps.
Start playing →Ages 8–13
Bridge Build
Build a bridge. Then drive a lorry over it.
Start playing →Ages 8–13
Particle Party
What are these tiny dots doing when nobody's watching?
Start playing →Ages 9–13
Osmosis Pool
The cell is drinking. Can you stop it before it bursts?
Start playing →Ages 7–12
Mirror Fold
Where do you put the mirror so the two halves match?
Start playing →Ages 7–13
Tower Wobble
The ground is about to shake. Build something that survives.
Start playing →Ages 8–13
Atom Builder
Build me a carbon atom. Then break it.
Start playing →Ages 8–13
Angle Ranger
Steer the rover. You only say how far to turn.
Start playing →Ages 11–13
Molecule Chains
Can changing one link change a whole chain?
Start playing →Ages 11–13
Division Clock
When is a cell ready to split?
Start playing →Ages 11–13
Earthquake Base
Can a soft base save a rigid building?
Start playing →Ages 11–13
Isotope Hourglass
When does half become half again?
Start playing →Ages 11–13
Ionization Tug
Which atom lets go of an electron first?
Start playing →Ages 9–13
Leaf Machine
Sunlight goes in. What comes out?
Start playing →Ages 8–13
Gear Train
Turn this little wheel. Make that big one crawl.
Start playing →Ages 8–13
Heart Pump
Keep this person alive while they run for a bus.
Start playing →Ages 7–12
Fraction Kitchen
Three children, two chocolate bars. Cut it fairly.
Start playing →Ages 9–13
Pulley Pull
Lift the heavy crate with one hand.
Start playing →Ages 10–13
Bond Forge
Some atoms share. Some atoms steal. Which is which?
Start playing →Ages 10–13
Octet Puzzler
Every atom wants a full outer ring. Can you make everyone happy?
Start playing →Ages 11–13
Feedback Thermostat
Can a body cool itself without your help?
Start playing →Ages 11–13
Wind Turbine Bench
Which blades make the brightest lamp?
Start playing →Ages 11–13
Breath to Energy
Where does the sugar go when muscles run?
Start playing →Ages 11–13
Robot Arm Reach
Can a tiny motor lift a heavy box?
Start playing →Ages 11–13
Percent Tank
What does a 25 percent fill look like?
Start playing →Ages 10–13
Build a Molecule
Every atom has arms. Join them up and see what you have made.
Have a read →Ages 11–13
Formula Foundry
How many ions make this compound neutral?
Start playing →Ages 10–13
Trait Lab
Two black mice. Why is one of the babies brown?
Start playing →Ages 9–13
Balance Scale
Take the same thing off both sides. Keep it level.
Start playing →Ages 7–12
Boat Hull
This lump of clay sinks. Make it float.
Start playing →Ages 11–13
Codon Kitchen
This is a recipe, three letters at a time. Cook it.
Start playing →Ages 10–13
Graph Racer
Fly through all five gates. You only get two numbers.
Start playing →Ages 9–13
Catapult
The target is far away. What angle do you fire at?
Start playing →Ages 11–13
Meiosis Mixer
Why are two siblings never exactly the same?
Start playing →Ages 11–13
Scale-Map Rescue
How far is the shelter on this tiny map?
Start playing →Ages 11–13
Function Machine
What rule turns every input into its output?
Start playing →Ages 9–13
Beak Island
Feed the birds for twenty years. What is left?
Start playing →Ages 9–13
Data Detective
Add one enormous number. Which average moves?
Start playing →Ages 9–13
Circuit Bench
One bulb is bright. Add another and both go dim. Why?
Start playing →Ages 9–13
Gas Lab
Squeeze the balloon. Where does the pressure come from?
Start playing →Ages 9–13
Solubility Sea
How much salt can one glass of water hold? What if it's hot?
Start playing →Ages 11–13
Carbon Loop
Where does carbon go when a forest disappears?
Start playing →Ages 8–13
Rate Racer
Three identical tablets. Make yours fizz out first.
Start playing →Ages 11–13
Population Ceiling
Can a population grow forever?
Start playing →Ages 11–13
Scatter Story
Does a trend survive one strange point?
Start playing →Ages 11–13
Heat Sink Builder
Can you cool this chip before it slows down?
Start playing →Ages 11–13
Concentration Mixer
Can more water make the same drink weaker?
Start playing →Ages 11–13
Equilibrium Seesaw
Can both sides keep changing while the level stays still?
Start playing →Ages 11–13
Acid Dropper
How many drops change a tenfold scale?
Start playing →Ages 11–13
Gas Balloon
What happens to a balloon when the air warms?
Start playing →12 more playgrounds are being built for 11 to 13 year olds.