Python playground ↗
✦ NEW · The programming foundations trail

Big coding ideas.
One little block
at a time.

Learn the building blocks of programming by snapping them together. Give Bit instructions, watch your variables change, and turn “what does that mean?” into “I made it work!”

Start with lesson one →Just let me build
20 guided tasksNo code typing neededSave your creations
Like Scratch-style coding? This is our own visual playground, powered by Blockly. Snap blocks together, run them on Bit’s stage, and test your ideas. You can also turn your blocks into Python when you’re ready. A computer or larger tablet gives the canvas more room; the text fields still need a little typing.
Programming basics for kids

Your map from “hello”
to “I built an algorithm.”

Each mission has a short explanation, starter blocks, a goal, a hint, and checks that run your actual program. Start at the beginning or jump to something you’re curious about.

Chapter 1

Values & variables

01

First this. Then that.

Sequences & output · 5 min

Try it02

Numbers aren’t words.

Primitive values & types · 7 min

Try it03

Yes, no, and not yet.

Booleans & missing values · 7 min

Try it04

A pocket with a name.

Variables & assignment · 7 min

Try it05

The snack shop.

Arithmetic & expressions · 8 min

Try it
Chapter 2

Decisions

06

Ask a true-or-false question.

Comparisons · 7 min

Try it07

Two doors. One decision.

If / else · 8 min

Try it08

The secret clubhouse.

And, or & not · 9 min

Try it
Chapter 3

Loops

09

Encore, little robot!

Counted loops · 7 min

Try it10

Count down to lift-off.

While loops & stopping · 10 min

Try it11

A pattern inside a pattern.

Nested loops · 9 min

Try it
Chapter 4

Data structures

12

A backpack full of things.

Lists & collections · 8 min

Try it13

Find the creature.

Indexing & zero · 8 min

Try it14

Hello to every creature.

Iteration over a list · 9 min

Try it15

Build Bit’s character card.

Records / dictionaries · 10 min

Try it16

Pancakes and waiting lines.

Stacks & queues · 10 min

Try it
Chapter 5

Build & debug

17

Bottle a little superpower.

Functions & reuse · 9 min

Try it18

One program. New possibilities.

Input, processing & output · 8 min

Try it19

The case of the missing point.

Debugging & testing · 10 min

Try it20

Build a treasure machine.

Your first complete algorithm · 12 min

Try it
No goal. No rules to invent for you.

What if you made
something completely yours?

All the blocks. An open stage. Your imagination.

Open the free playground ↗

Block Lab uses Blockly. It is an independent Kids Code learning experience, not the Scratch editor or an official Scratch product.