This project requires a micro:bit. Use its tilt controls to control the movement of the balloon through the cave. If you don't have a micro:bit, there's a remix of this project that uses keyboard controls here: https://scratch.mit.edu/projects/890936919/
This is an example from the 2nd Edition of the book Scratch Programming in Easy Steps by Sean McManus. More info here: http://www.sean.co.uk/books/scratch-programming-in-easy-steps/index.shtm
