For me it feels confusing and we also have the issue that those sandboxes may be handled differently.
What if the code-golf sandbox fills up more quickly? Will we then have different version numbers for each of them?
It feels even more confusing than a single sandbox with lots of answers (There is the possibility to sort answers by active and see the most recent changes on the top).
Therefore, I'd like to vote to close those sandboxes as duplicates. But before doing that I wanted to ask for some discussion of this issue here.