Click the Green Flag. Use Turbo mode.
Intro by @PullJosh. My first project in almost a month. Also my first non-Blender project in almost two months (if you count SlimeJosh as a project. Otherwise, it would be over two months). I was messing around in the Scratch editor, trying to think of a Scratch project to make, and then I had a blue version of what you see on the left, except it went on forever. I had an idea, so I made it stop after a certain amount of time, and also use black instead of blue.