Is there any way to hide the mouse pointer?

make your own windows cursor set and make every single cursor a blank cursor picture

can you clarify?

Socialix wrote:

make your own windows cursor set and make every single cursor a blank cursor picture

I don't think this is what the op is looking for

The CSS rule:

With Scratch? No, and it's rejected. A rejected suggestion is a suggestion that the ST has discussed and decided it wouldn't be a good fit for Scratch.

Za-Chary* wrote:

1.9 “Control mouse pointer” block
This block, and others, could be used to hide the mouse pointer or change the way the mouse pointer looks in a project. These blocks, however, do not significantly change the types of projects that can be created with Scratch; for more information, see this post. In addition, they may cause confusion to users, wondering where the mouse pointer went. A feature to control the mouse pointer, including freezing it or preventing it from leaving the project screen, poses similar confusing problems.

hide mouse pointer :: looks

Edit: Funny typo