How to Create Custom Blocks in Scratch 3.0: My Blocks Complete Guide for Beginners

If you've been exploring Scratch and want to take your coding skills to the next level, learning how to use My Blocks in Scratch 3.0 is one of the best ways to do it. Whether you're a beginner still figuring things out or an intermediate coder ready to organize your projects more efficiently, this feature will transform the way you build games, animations, and interactive stories.

In our latest tutorial at Kodex Academy, we take a deep dive into the My Blocks in Scratch. This tutorial is specifically designed for beginners and young coders, but even experienced Scratch users can benefit from the power of custom blocks.

Step-by-step guide to making reusable custom blocks in scratch with text, number, boolean inputs and reporter blocks in Scratch 3.0 – perfect for beginners and kids.

Why Learn About Custom Blocks in Scratch?

Scratch is known for its user-friendly, drag-and-drop interface that makes programming accessible for all ages. But as your projects grow more complex, it's easy to fall into the trap of writing the same sets of blocks over and over. This can make your scripts messy, harder to read, and more difficult to troubleshoot.

This is where My Blocks in Scratch come in.

Creating custom blocks (also called functions in other programming languages) allows you to:

• • Avoid repetition
• • Break complex code into smaller parts
• • Debug your projects more easily
• • Reuse code across different sprites or scripts

In short, they help you write cleaner, smarter, and more efficient code.

What You'll Learn in This Tutorial

1. What is the "My Blocks" palette in Scratch?
2. How to create custom blocks in scratch
3. When and how to use input options (number, text, boolean)
4. Why custom blocks reduce code repetition
5. Real-world project examples using My Blocks in Scratch
6. Debugging tips to make your custom blocks smarter

What Is the "My Blocks" Palette in Scratch?

The My Blocks palette in Scratch is essentially your personal toolset. While the other palettes give you predefined blocks (like motion, looks, or sound), My Blocks allows you to create your own custom code blocks, much like functions in traditional programming languages.

Imagine you're building a game and you want your sprite to:

• • Move in a zigzag
• • Check if it's touching an enemy
• • Display a health bar

Instead of dragging out the same set of blocks over and over, you can create a custom block called "Zigzag Movement" or "Check Health," define it once, and then reuse it as many times as needed.

This not only saves time, but also makes your code:

• • Easier to read
• • More organized
• • Simpler to debug

How to Create Custom Blocks in Scratch

Creating your own block in Scratch is straightforward. Here's how:

1. Go to the My Blocks palette on the left side of the editor.
2. Click the "Make a Block" button.
3. Give your block a descriptive name (e.g., "Jump Action").
4. Choose whether to add inputs (more on this below).
5. Click OK.

Once created, you'll see a definition hat block pop up. This is where you add the blocks that describe what your custom block does. Think of this as the recipe for your block.

Here's an example:

• • You create a custom block called "Fade In."
• • Inside its definition, you add repeat and transparency change blocks.
• • Whenever you use "Fade In" in your code, Scratch follows that recipe.

Easy, right?

Open the My Blocks Palette

Log into Scratch → Start a new project → Click the 'My Blocks' category in the left palette (purple color).

Click 'Make a Block'

In the My Blocks palette, click the purple 'Make a Block' button. A pop-up will appear to name your new block.

Name Your Block and Add Inputs (Optional)

Give your block a clear name → Click 'Add an input (text, number, boolean)' → Click 'Add a label' for extra text → Click OK.

Build the Block Definition

Your new block appears in the workspace with empty slots. Drag the commands you want inside the 'define' hat block.

Use Your Custom Block Anywhere

Your new block now appears in the My Blocks palette. Drag it into scripts and fill the inputs just like normal blocks.

Using Input Options: Numbers, Text, and Booleans

Custom blocks become even more powerful when you use inputs. Inputs are like variables that you pass into the block, allowing you to customize what the block does each time it's used.

Number Input

Use this for values like:

• • Speed
• • Size
• • Duration
• • Position

Example: Block: `Move Forward (steps)` Usage: `Move Forward (10)` vs. `Move Forward (100)`

Text Input

This is great for:

• • Displaying custom messages
• • Naming players or sprites
• • Dialogue in animations

Example: Block: `Say (text)` Usage: `Say ("Welcome!")` or `Say ("Game Over")`

Boolean Input (True/False)

Useful for decisions and conditions.

Example: Block: `If (IsEnemyNear?)` Inside, you could use logic like: `If touching enemy → decrease health`

This modular approach mirrors what real developers do with functions and parameters in languages like Python or JavaScript, making it a great way to introduce more advanced thinking in a beginner-friendly environment.

How Custom Blocks Reduce Code Repetition

One of the biggest coding principles across all languages is DRY: Don't Repeat Yourself. Custom blocks are Scratch's way of helping you stick to that rule.

Let's say your sprite needs to:

• • Jump
• • Spin
• • Play a sound

...and you want that sequence to happen in multiple parts of your game. Instead of dragging all those blocks over and over, you can put them inside a custom block called "Special Move." Now, every time your sprite needs to perform that move, you just call that block.

If later you want to change how the move works, you only have to do it in one place. That's the magic of clean, modular code.

Real Project Examples Using My Blocks in Scratch

To see custom blocks in action, watch this tutorial: Introduction of Scratch | Video Tutorial

Here are some real project scenarios where My Blocks shine:

Game Development

• • Enemy AI: Create a block for enemy movement and reuse it across clones.
• • Power-Ups: Make a block called "Apply Power-Up" and pass in the power-up type as an input.

Animations

• • Scene Transitions: Create blocks like "Fade to Black" or "Slide In Text."
• • Dialogue Management: Use text inputs to manage dialogue for characters.

Quizzes or Learning Apps

• • Check Answer: A custom block that evaluates input and gives feedback.
• • Score Update: A reusable block to manage points across levels.

These examples not only make your projects more manageable but also elevate their complexity in a way that's fun and educational.

Debugging Tips with Custom Blocks in Scratch

Debugging can be a frustrating part of coding, especially when scripts get long. Custom blocks in Scratch help localize problems to smaller, manageable chunks.

Here are some tips:

Test Blocks in Isolation

Create a test script that uses just the custom block to see if it works correctly.

Add Temporary Visual Feedback

Use blocks like `say` or `change color effect` inside your custom block to confirm it's being executed.

Use Booleans for Testing Logic

If your block behaves differently based on conditions, test with different boolean inputs to see how it responds.

Keep Blocks Short and Focused

Try not to overload your custom blocks. One block = one task. This helps with both readability and testing.

Who Should Use This Feature?

Custom blocks are suitable for a variety of learners and educators:

• • Kids learning intermediate Scratch – Great way to step up from basic motion and looks blocks
• • Teachers and instructors – Use My Blocks to demonstrate programming principles
• • Young coders and game developers – Build large projects more efficiently
• • Parents teaching coding at home – Make Scratch projects more interactive and organized

Want a full beginner's guide to Scratch programming? Check out this amazing course on Udemy: Scratch Block Programming Course on Udemy

Learning to use My Blocks might seem a little advanced at first, but once you try it, you'll wonder how you ever coded without them.

Got stuck somewhere? Want to share your own custom block ideas? Ask your questions in the comments under the video or reach out to Kodex Academy.

Final Thoughts: Code Smart, Not Hard

Scratch was built to help you learn programming without the barriers of syntax. But it also contains powerful features like My Blocks that mirror real coding concepts like functions, abstraction, and modularity.

So don't just code more — code smarter.

Happy coding with Kodex Academy! 🚀