Check this list of virtual world games like Club Penguin which provide similar gameplay. Club Penguin is a popular MMO (massively multiplayer online) virtual world game by New Horizon Interactive. The game is set in a snow filled world where you can play as cartoon penguin-avatars. Don't forget to mention if we miss any games as we keep on updating this list.
Moshi Monsters is a fun online world created by Mind Candy, where you can adopt your own monster, go on adventures, play games, solve puzzles, be creative, and communicate with friends in a safe environment. The site have over 80 million registered users in 150 territories worldwide.
Poptropica is an online, role-playing game owned by Pearson PLC, the global publishing and education company. It was made by Jeff Kinney, the author of the Diary of a Wimpy Kid series. The site is aimed at children ages 6 to 15. Players can go to different islands, compete in multiplayer games, and communicate with each other. Players are given several quests, called islands, which they are encouraged to complete.
Roly Poly Land
RolyPolyLand is a fairy-tale land where Rolies live. There are a lot of great things here for you to do. There are games, adventures, fashion shows, sports tournaments, great parties and you can hang out with friends.Here, you can make new friends, get new outfits, decorate your house, or become a businessperson by opening your own club. You can also learn magic and travel to incredible countries.
Animal Jam is an MMO Virtual world for kids who love animals. The game was launched by Smart Bomb Interactive in partnership with the National Geographic Society. Here you can create your own animal, buy accessories and clothes for it, customize your den, learn about the natural world outside while meeting new friends and playing with them.
Neopets is a never ending online game where the players create and take care of their virtual pets called Neopets and explore the virtual world of Neopia. Players can earn Neopoints(NP) through various means like playing games and selling items, these earned neopoints can be used to buy various virtual goods and services.
More virtual games like Club Penguin you might enjoy playing:
Habbo Hotel, Fantage, Wizard101, Space Heroes Universe, Cartoon Network Universe: Fusion Fall, Free Realms, Dizzywood, Furry Fable, WoozWorld, ToonTown Online
Panfu,...if you can think of more, then don't forget to mention it in comments.