1. Cartoon Network
There are almost 200 games on the Cartoon Network's gaming page—and they're all free. The most popular right now? Teen Titan's Jump Joust, which uses characters from the popular series. But do a little clicking around and you'll find hilarious games like Sewer Sweater Search, or Suburban Karate Master, or the oh-so-cute Baby Bears Boxed In. Go forth and game!