What virtual worlds are for kids but have no register or download

It's really kind of not possible for a virtual world to NOT have a registration packet, so I couldn't find anything on that. But, Poptropica.com is a VERY good and addicting site for kids AND teens to interact in, and when you click "New User" you'll get to go and and start playing and creating your character. You don't have to worry about registrating for it quite yet, but once you feel like saving your game, that's when you register. You don't need an e-mail for this, so it'll be easy to register. You just need a password and a username, and that's it!

Hope I helped:)