You've actually already seen variable scoping in Scratch, or a simplified form of it.

Scratch doesn't call it variable scoping, but nevertheless that's what it is.

Noobies to Scratch frequently get a bit worried the first time they create a variable and see this:

If you've worked with Scratch cloning, you'd be well aware why sometimes you want a variable to be "for all sprites", and other times "for this sprite only".