[fullstop]

Yes, I dug in a bit further and found where it was checked in the editor. (at least in the reconstruction!)

https://github.com/asiekierka/reconstruction-of-zzt/blob/mas...

It looks like the SECRET flag was intended to prevent editing of both save files and built-in worlds.

[asiekierka]

The save file check is separate to the SECRET flag, but they are both meant to not be editable. (Of course, community-made external editors like KevEdit lift this restriction.)

[fullstop]

I understand. With that being said, changing "SECRET" to "NECRET" and then saving results in a .SAV file with "SECRET" in place again.