Getting all A's on every level will unlock Expert mode. This includes character commentry [eg. Rouge on a lot of levels], more enemys, harder enemys, harder and longer levels, but most importantly-a homage to the original Sonic games. Run out of lives and you have to start again from the beginning [you don't start the whol expert mode again, just the story your working on]. Devil Doom is also about twice as powerful and has the ability to use Chaos Control to stop time [this is done very rarely, about once in every 5 battles].
You an obtain the shadow the hedgehog trophy in all- star mode!!!!!:]
You can't.
You have to finish the regular story mode.
Yes, that's what the 2P mode is for.
you beat the last boss
You have to finish all of the stages in story mode.
I got it while playing on all-star mode.
No, shadow the hedgehog is black.
you plug in the controller and then you can just move the person
Shadow is a blato hedgehog.
yes shadow the hedgehog was created by eggman
Shadow the Hedgehog