Copy this sprite into your NEW game. Trying to add this in a old game makes it bad like Sky Gliders. How it works is inside the project. NOTE: Since nothing is being updated, the fps will start as 'infinity' (technically undefined), so add some stuff!
Got inspired by @theChAOTiC , and wanted to learn how to do this for myself, as it's very useful. Also Scratch Wiki has a guide on it here: https://wiki.scratch.mit.edu/wiki/Game_Loop