See inside. Start at step 1. R to reset all sprites back to their starting position, space to hide all sprites. All other controls are provided in every sprite as they come up. I can't emphasize enough how important experimenting is! If you find out about something you didn't expect, try to take that opportunity to learn about it. Ask yourself why this happens. That's the best way to learn programming. I intentionally tried to lead you into some unexpected situations sometimes, that's by design.
I really hope this project helped people. I'd love to see any projects you make with this in the comments (for this project specifically, I'll allow (relevant) advertisements!)