What You Will Build
Create a space scene where characters share thoughts and emotions using speech and thought bubbles. Follow the guide below to build the project, then open the official Raspberry Pi page for starter files, worked examples and extra help.
🍓 This project is on the Raspberry Pi Foundation website. Click the orange button above to access the full guide, starter Scratch project and extension activities on projects.raspberrypi.org.
What You Will Learn
- Use Events blocks to start scripts when the green flag is clicked
- Display speech and thought bubbles using Say and Think blocks
- Trigger sounds from the Sound library
- Use broadcast to pass messages between sprites
- Switch backdrops to change scenes
Step-by-Step Guide
- 1Open Scratch at scratch.mit.edu — no download needed, runs in any browser.
- 2Click the folder icon to choose a Space backdrop from the Backdrop Library.
- 3Add two space character sprites from the sprite library (e.g. Nano and Pico).
- 4Click Sprite 1. Drag when 🏳️ clicked from Events onto the workspace.
- 5From Looks, add say [ ] for [ ] secs and type a greeting.
- 6From Sound, add play sound [Pop] below the say block.
- 7In Events, drag broadcast [message1] below the sound block.
- 8Click Sprite 2. Add when I receive [message1] from Events.
- 9Give Sprite 2 its own say block with a reply.
- 10Click the green flag — both sprites should speak in turn.
Extension Challenges
Finished the main project? Push further:
- Add a third sprite that reacts to a second broadcast message.
- Try switching backdrops mid-scene using switch backdrop to [ ].
- Replace speech bubbles with thought bubbles using the think block.