you have to beat levels with good ranks like S or A
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you don't unlock it, it's automatically optional when you start a new file. go to the Sonic Simulator.
collect all the red star rings then beat all the levels in the sonic simulator
You must collect all red rings, which will unlock all Sonic Simulator stages. Then, you must complete every Sonic Simulator act to collect the Chaos Emeralds. After this has been done, you can turn into Super Sonic by pressing whatever button is mapped to activating a wisp while you have 50 rings or more. Super Sonic cannot be used in boss acts.
To unlock Super Sonic, you must do two things.. First you must collect all 180 Red Rings from each of the 36 main acts, this will unlock all of the 2nd and 3rd Sonic Simulator acts. Then you must clear all 21 of these Sonic Simulator stages at least once, you may do this as a single player. Once you've done that, the options satellite on the main screen will glow, and give the option to use Super Sonic. In Super Sonic mode, you collect 50 gold rings and activate the ability like wisp abilities. Special wisp abilities will be disabled, and the stage design will change depending on this. Super Sonic cannot be used in challenge mode.
2-player mode is in a special area called the Sonic Simulator. It has a metal Sonic face when you choose it.