I’m not sure how difficult this would be but I think it would be good to be able to login to the playground using your forum account login details.
This would be good as it would allow people to be able to save their creations against their accounts and modify them again later.
I don’t know about anyone else but I always lose track of my creations.
There are a number of online code editors like CodePen, StackBlitz and CodeSandbox, there all have accounts.
What do you think?