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CoderDojo Roscommon

Join today's CoderDojo challenge and learn to create an exciting Ghost Buster game using Scratch! This beginner-friendly session focuses on essential programming concepts like loops, decisions, and variables. You’ll design your own Pac-Man character, create distinctive ghosts, and implement interactive gameplay mechanics. Follow simple step-by-step instructions to bring your game to life, from utilizing the paint editor to implementing scoring and leveling up as players catch ghosts. Let’s code and have fun while learning!

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CoderDojo Roscommon

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Presentation Transcript

  1. Scratch Beginners CoderDojo Roscommon

  2. Today's Ninja Challenge:Create a GhostBuster Game Like This

  3. Today's Big Ideas Designingyour game Loops & Decisions Variables Ideas from last time …

  4. How to Get Started Reminder from Week 1

  5. Steps To Make This Game

  6. Paint Editor in Scratch Paintbrush Eraser Rectangle Fill tool Ellipse Eyedropper Stamp Select Text Line

  7. DesignPacMan and a Ghost Circles: head & eyes Circles, Rectangle & Paintbrush Fill with "blank" Lines for mouth TIP: Use distinctive colour (e.g. yellow) at front/mouth: will use this when detecting if ghost is eaten

  8. Make PacManFollow the Mouse Buttons:Rotate any direction Face left/right Don't rotate

  9. Make Ghost Move Around What is significance of 1-360? TIP: Get one ghost working fully – you can duplicate it later. Right-click on a sprite to duplicate it.

  10. Loops and Decisions Key programming concepts Loop: Repeat code multiple times Decision: Decide whether or not to do something

  11. When PacManGets Ghost … How we detect PacMan: colour of its mouth Show at start. Hide when eaten. Wait & show again. Switch to Sounds tab & import sound

  12. Duplicate Ghost,Make Each One Look Different

  13. Variables To keep score, need a Variable: • A key programming concept • Stores a Value (number/text data):this can vary • Has a Name – this is fixed:use this in the code to compare/change values

  14. Variable to Keep Score 1 Variables can be: • Global (for all sprites): what we will use • Local (one sprite only) To do: • Make variable • Set it to 0 at start • Add 1 each time a ghost is killed 3 2 Add this to every ghost

  15. If You Want to Do More … Add Levels: When you have caught 6 ghosts, make the ghosts go faster You will need: Variable for Speed, initially 2 Variable for GhostsCaught Code: when GhostsCaught = 6,set it back to 0 and increase Speed by 2

  16. If You Want to Do More … Make a variable Speed Set it to 2 at start Change ghosts to move at that speed Make variable GhostsCaught When ghost is caught, Change by GhostsCaught by 1(beside where you change Score by 1) Add code to PacMan: Set GhostsCaught to 0 at start If GhostsCaught is 6 • Change back to 0 • Increase Speed by 2

  17. Steps to Make the Game Your game will have slightly different steps. Get one part working before moving on!

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