I want to publish a tool using Google Sheets that should be as easy to use as possible, so I would not like the user to have to create a copy (requiring a Google account), then editing cells in that, instead I want them to edit two cells in my file directly.
Now the problem: The best I've found so far is protecting an entire sheet except for those two cells, which at least prevents adding new rows etc., but not creating new sheets in that file. Alternatively, I could share ranges with certain mail addresses, but that would require manual action every time someone wants to use my tool (and additional steps again). I was also unable to to find any advances sharing options other than nothing/view/comment/edit and some unrelated options, like disabling printing or re-sharing.
So how do I make everyone able to edit only a few cells, nothing else?