Scratch 3 Walkthrough and Demo

by Isaac Wellish

published January 18, 2019, last updated March 08, 2024

posted in MakeCode Programming Circuit Playground/ Express

21

Beginner

Skill guide

Block types

Scratch is a "block-based" programming language. This means instead of writing lines of code to program, we use "blocks". Each block has a specific category that describes what its purpose is. Sprites are the objects that perform actions in a project and these blocks tell the sprites what to do. Code blocks can also tell a stage or backdrop how to behave.

The different types of code blocks:

Motion

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Define the movement of sprites

Looks

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Change the appearance of sprites. Gives the ability to change costumes and apply graphic effects.

Sound

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Play audio by recording sounds, using Midi notes and more.

Events

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Trigger scripts or series of code blocks. Consists mainly of hat blocks which start a script.

Control

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Dictate the flow of a project. Provide mechanism for "looping" different blocks and scripts.

Sensing

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Let multiple sprites interact with themselves and/or the stage. Can determine how two sprites collide for example.

Operators

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Allow various mathematical functions within a project. Can be used to modify variables and strings.

Variables

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Used to store data in projects, like a name or a score.

My Blocks

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You can create your own blocks!

Extension Blocks

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At the bottom left of the screen. These blocks let you connect to hardware or access a number of other block types like the pen, or music blocks.

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