Originally Posted by Mr. Hunt
There aren't "Joker levels" on the PS3 version. You just get to play through the challenges AS the Joker instead of Batman. He has his own moves and gadgets, so it isn't just a reskin.
Honestly... big whoop. I mean, playing through as the joker is neat, but it's not what I would call top of the line content by any means, and most people would likely play the story and quit.