:: UPDATED ::
Just in case you have some free time and want to play a good game but don't have more time than an hour then this is your website. At Cartoon Network you can play many Flash/Shockwave games.
These is one of the games I liked most: Teen Titans.
Have a good time playing it!

Thanks to Andy Makely to point out my mistake, another website (www.tierradejuegos.com) have stolen the games.