**Course Title:** Introduction to Programming with Scratch **Section Title:** Events and Message Broadcasting **Topic:** Introduction to broadcasting messages between sprites **Introduction** In the previous topics, we have learned how to create interactions between sprites using events, such as "When green flag clicked" and "When sprite clicked". However, sometimes we need to communicate between multiple sprites that are not directly related to each other. This is where broadcasting messages comes in. Broadcasting messages allows us to send a message from one sprite to multiple sprites, controlling their actions and behaviors. In this topic, we will explore how to broadcast messages between sprites in Scratch. **What is Broadcasting?** Broadcasting is a way of sending a message from one sprite to multiple sprites. When a sprite broadcasts a message, all other sprites that are listening for that message will receive it and can respond accordingly. In Scratch, broadcasting is done using a block called "Broadcast" which is found in the "Events" category. **How to Broadcast a Message** To broadcast a message, follow these steps: 1. Go to the "Events" category and drag the "Broadcast" block into your script. 2. Click on the dropdown menu and select "New message". 3. Type in the name of the message you want to broadcast. You can use anything you like, but it's a good idea to make it descriptive. 4. The broadcast block will now display the name of the message. **How to Receive a Broadcasted Message** To receive a broadcasted message, we need to use a block called "When I receive" which is also found in the "Events" category. Here's how to use it: 1. Go to the "Events" category and drag the "When I receive" block into your script. 2. Click on the dropdown menu and select the name of the message that you want to receive. 3. The script will now run when the sprite receives the broadcasted message. **Example: Broadcasting a Message** Let's say we want to create a game where a sprite says "Hello" when another sprite says "Hi". We can use broadcasting to achieve this. Here's an example: * Create two sprites: "Sprite A" and "Sprite B". * Add a script to Sprite A that broadcasts a message called "Hi" when it is clicked. * Add a script to Sprite B that listens for the "Hi" message and says "Hello" when it receives it. **Script for Sprite A:** ``` When I am clicked Broadcast [Hi] ``` **Script for Sprite B:** ``` When I receive [Hi] Say [Hello] ``` **Key Concepts** * Broadcasting messages allows us to communicate between multiple sprites. * The "Broadcast" block is used to send a message from one sprite to multiple sprites. * The "When I receive" block is used to receive a broadcasted message. * Messages can be custom-named, making it easy to create multiple messages for different purposes. **Practical Takeaways** * Use broadcasting to communicate between multiple sprites in your projects. * Use descriptive names for your messages to make it easy to understand what each message does. * Experiment with different messages and scripts to see what you can create. **What's Next?** In the next topic, we will explore how to use message broadcasting to coordinate actions between sprites. **Need Help or Want to Discuss?** Leave a comment below if you have any questions or need help with this topic. **External Resources** For more information on broadcasting messages in Scratch, check out the official Scratch documentation: [https://scratch.mit.edu/docs](https://scratch.mit.edu/docs) **Try it Out!** Try creating a project that uses broadcasting to communicate between multiple sprites. Experiment with different messages and scripts to see what you can create.