I think you just need the Chaos Emeralds, actually. I got all 7 Chaos Emeralds but only 4 Sol Emeralds and I was able to go super. Speaking of which, sorry if this has been asked previously, but would there be a way to change how super forms are activated? I still want to be able to fly as Tails or use Sonic's shield abilities without transforming, afterall. Since jumping is already mapped to two separate buttons, perhaps one button can act as a transform-free jump?