Where can you find a free virtual world that has no downloads and dose not need a emailadress

Poptropica.com is a free virtual world. But if you want membership you have to pay. On
Poptropica you make your own person and explore Poptropica. In the game Poptropica is like the world. You can go to different islands and help them. If you need any help they have island walkthoughs videos on Youtube.com.When you go there (youtube) just type in Poptropica in the search box.