Just obey the instructions. If Scratch variables changing twice a second is a problem for you please don't use this project. NB If you're still 'New to Scratch' you can't use cloud variables so this won't work for you. This demo doesn't actually use cloud variables because if it did and the project was already running elsewhere when you start running it that would give confusing values. What's important here is the idea, not the actual use of the cloud within the demo.
