I haven't tried the challange modes yet, I want to try the joker challanges but the story game is too much fun. The scarecrow stuff is so trippy, I love it. I just started figure out how to get the riddler trophies. I didn't realize that you have to hold down L2 and kind of scan something for the riddle to be solved. I'm starting to get a ton of them. Its really cool that you can go back to other levels that you've done already to get the some of the riddler trophies. Bane was a pretty cool level to play as well. It's just aweome hearing the voice of Harley and the Joker constantly taunting you from the old animated series.