So far. The Super Transformation is far from completion. (Super Sonic Sprites by "TheKnucklesMainG4")

Despite being Water (Or Mutated Chao) slime sounds

(Advance 1) Angel Island Zone.

Originally for Infinite Battle Now retooled

Sumin didnt just make some characters But also sandbag (Though bare bones)

I'm taking you down like its 1998/1999!

(coming some time soon or something.) The 1st Sonic Battle Redux arcade Run: Sonic.

Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

The "Big Green Man" (Guest) teaser.

2/3 of them are references to

Sonic's Concept and is also a Skin in Sonic Superstars Cream's Debut (Though inconsistent looks)

A former 90s rival's (A red capped plumber guy) recent 3D platformer since 2017

Act Music as Rounds? (may not apply to every stage)