It's not clear that you will need an account to see the problems. Logged in with my account and it's exactly the same page. It's not Dec 1st everywhere yet, so they might open up for everyone when they do open them up.
I would like to see and try to solve the scenarios for myself, not to get meaningless internet points. If you look at their front page, you can do that right now. So why do I have to create an account to even see these special advent scenarios?
> Sign up for a free account
Hahaha, no. Closes tab