My favourite free online games site is miniclip.com. It is one of the most biggest game sites in the world! My favourite game there is Club Penguin, a multiplayer game. Try that game! It's great! Unfortunately, Club Penguin is so popular that when you start playing, a bunch of penguins pop up.
To play you need a personal penguin of your own.
To get a penguin, Sign Up!
Sorry, I do not have a link for this.