You know what would make it more hardcore? If there were only like 2 days, then it was eternal night. Anyone like that idea?
One of these weeks, I'll be attending, gosh darnit! Other than there being no natural regen and the walls shrinking after 60 minutes, are there any other changes from a vanilla world?
Standard world generation pretty much. Further rules are enforced once meetup happens, like no hiding in sky bases or underground, for example.
