there are hidden rings in each stage find it and then you have to play the spacial stage and win then you get all the chaos emeralds and soon enough you can play as super sonic!
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get all 7 chaos emarelds and get 50 rings
Collect all 7 chaos emeralds.If you didn't then you cant play as Super Sonic or Super Shadow!
collect all 7 chaos emeralds and double jump.
get the 7 chaos emeralds
In the Sega Megadrive game you had to collect all 7 chaos emeralds by clearing special stages. The emeralds enabled you to turn into super Sonic when you collected 50 rings.