World 4 · Forever and together · Guide 3 of 5Free guide
How do I stop forever?
A stop block ends everything. Put it under a hat, and you choose when.
Meet the stop block
A forever loop never stops by itself. The stop block is how a program stops it. When the stop block runs, everything stops — every loop, every character, all at once. But a stop block on its own runs straight away. Put it under the 👆 hat, and it waits for your tap.
A forever loop and a stop under a hat: that is a program you can steer.
See it work
The car has two programs. One drives for ever. The other waits for a tap, then stops everything. Watch the finger.
When tapped
The car went all the way round once and kept going. Then the tap came, the stop block ran, and everything stopped — right on the 🅿️.
Your turn
Now you're the programmer.
Can you park the car?
Press ▶, then tap the 🚗 just as it reaches the 🅿️.
The car's program
Blocks
Your program
Go further
What if you take the hat off?
Pull the 👆 hat off and press ▶. The stop block runs at once — before the car has even left — and everything stops on the spot. A stop with no hat is a program that ends before it starts. The hat is what lets you choose the moment.
For grown-ups
Stopping a running loop from outside it is what an interrupt or a cancel button does — the program keeps going until an event tells it to end.
Keep going
Next in World 4Fast and slow →Where this goes
Make a game other kids can play
The blocks on this page are a first taste. In a Kubrio project your kid builds a real game — powers, triggers, levels and all — and other kids get to play it.