Scratch

Does it still exist or is it just gone?

This is a bug which you can actually use to create sprites which you can't look at the scripts for. It is called the 'Hidden Sprite Technique'. To use it, follow this procedure:

1) Click the 'Paint new sprite' button.
2) Drag away the Paint Editor and press the 'Paint new sprite' button again.
3) Click cancel again.
4) A white dot is your sprite. It's there, but it doesn't appear in the sprite pane. Access its scripts by clicking on it. You ought to put maybe a code you have to type out to make it show up so you can access it even if it isn't showing.