There should be cache variables, where it saves the variable as a cookie. This would be useful for:

Starting a platformer project, and starting at where you left off.
Starting a clicker/simulator project, and starting with the same stats as you had when you left off.
Easier Save/Load systems.
Save Files on project.
Saved passwords, usernames, and files on OS projects.

There are also cons.
If you use an repeat 1000 block with a save variable to cache block, it would clutter the cache.

Cache variables only support numbers (0-9), and letters (A-Z), spaces ( ), underscores (_) and hyphens (-).

The blocks:

save [

Cookies aren't stored in cache, they are separate things.
Read more on cookies (which because of their nature, wouldn't work for this), localStorage, and cache (which also wouldn't work).

Also this is a duplicate. The original is probably on page 2 or 3.

It looks like this is a duplicate topic of this one over here so I'll close it to keep the conversation all in one place.

Please use the existing topic in the link above.