How Far Can You See?
See how high you need to fly to look farther across the Earth. Move the sliders and watch the horizon change!
Open simulatorPick a Fun Tool!
Try cool simulators, brain-teasing puzzles, and build-your-own playgrounds. Click any tool below to start exploring — no grown-up knowledge needed!
Space & Science
Ball on a Moving Train
Throw a ball on a moving train and see what happens. Compare how fast things look from different places.
Open simulatorClocks on a Fast Rocket
Watch two clocks tick — one standing still and one on a fast rocket. See why time can run slower when you go really fast!
Open simulatorWhy Mess Spreads Out
See tiny dots spread out when you open a box. Learn why messy rooms tend to stay messy!
Open simulatorConnected Clocks
Explore how two tiny connected clocks work together. A fun way to think about how time works in the quantum world.
Open simulatorUniverse Story Timeline
Scroll through the whole story of the universe, from the very beginning to far in the future. Zoom in and out to explore every big moment!
Open simulatorWhat Fills the Universe?
Try sliders to see what the universe is made of. Change the settings and watch how stars and space behave!
Open simulatorComputer Puzzles
Switch Puzzles
Flip switches and watch how they connect like puzzle pieces. See what happens when you combine AND, OR, and NOT gates!
Open simulatorYes/No Chart Builder
Type a puzzle with yes and no answers and see every combination in a chart. Great for figuring out how logic works!
Open builderCounting with 0s and 1s
Add and subtract using only 0s and 1s, step by step. Watch carries light up as you go!
Open visualiserDifferent Ways to Write Numbers
See the same number written in binary, decimal, and other ways. Type a number and watch all the versions appear!
Open converterNumbered Memory Boxes
Explore rows of numbered boxes like a computer's memory. See letters and numbers stored inside each box!
Open explorerColour Number Mixer
Mix colours using number codes and do maths with hex numbers. Type a colour code and see the swatch appear!
Open calculatorCode Playgrounds
Web Page Builder
Write web page code and see your page appear right away. Try fun starter demos to build your own page!
Open sandboxPage Style Playground
Change colours, fonts, and layouts and see the page update live. Play with styles to make pages look cool!
Open sandboxCode Playground
Write small programs and run them to see what happens. Try demos for loops, functions, and more!
Open sandboxQuick Page Builder
Build a web page fast with ready-made buttons, cards, and menus. Change the code and see your page on screen!
Open playgroundMake a Web Game
Edit game code and play on a live canvas. Try Pong, Snake, Breakout, and other games!
Open labPage Design Tools
Box Spacing Explorer
Slide controls to change padding, borders, and margins around a box. See how spacing makes pages fit together!
Open explorerBox Line-Up Tool
Line up boxes in rows and columns by changing settings. Watch the layout change and copy the CSS code!
Open builderColour Mixer
Slide red, green, and blue to mix any colour you want. See the colour swatch and copy colour codes!
Open mixerPage Parts Map
Paste web page code and see a map of all its parts. Blue boxes are elements, gold dots are text!
Open inspector