In the second act of each zone, you need to obtain a key. These keys are scattered throughout the level, but you only need one when you reach the goal. If you have the key, you will enter a special stage where you must catch up to the Emerald. You can use the balloons and other gimmicks to speed up and help yourself in chasing it down. There is one of these per zone, with a total of seven zones. Happy hunting.
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get the 7 chaos emeralds
finish all 4 stories and get all 7 chaos emeralds to unlock the last story
collect all 7 chaos emeralds and double jump.
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!
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.