I recently went back to playing Habbo for a short while, and it's definitely changed a lot. There's a lot more rooms than I could remember from back in 2008, and there's quests now, that earn you in-game cash to help furnish your own lounge.The beginning quests will generally walk you through the different areas, requiring you to learn how to interact with the various objects in-game.
There's also several kinds of 'sports' which in the Habbo universe means that you'll be playing mini-games that resemble, and recreate the feeling of trying to make something on Drawball, while a hundred different people try to ruin it for you at the same time. [The Comics]