How do you get super Sonic in Sonic dx

you have to get 100# on & all the storys, then a new story will be avalable. To get him, go to the master emerald and youll se knukles and eggman + a cutscence then a flash of light. Another one of sonic's dreams. keep heading towards the master emerald (you will see 3 cutscences on the way.) then back on the adventure! go to the jungle, and a few cutscences will apear. Finally, you will face Perfect Chaos with Super Sonic.