From: Xiahou Shake | #015
Is the Robin dlc just for challenges and such, like Joker was in the original?
Yeah but much better. I didn't care much for the Joker challenge maps, these are much better, and you get Riddler challenges too, which I haven't played yet, but it's apparently you solving puzzles and such. I think. I'll try it out after I beat this one Predator map and get back to you.
Regardless, it's so awesome.
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~Halo Rolling around at the speed of sound.
http://img593.imageshack.us/img593/2417/sonicspeed.jpg