Another mechanic that I coded for the first time

"Grab Canceling"

The only thing that varies between character is: how long will they actually throw the opponent while Pressing Y + Holding FWD/Pressing Z + Holding Backwards will still do the cancel trick

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

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

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

The Classic Hop and Dive. (Amy Rose)

Another returning move For Amy Rose Amy Flash.

The "Big Green Man" (Guest) teaser.

Every Continue and Confirming

As of 6/26/2022

Yoshi and Birdo cosplaying as Ichigo Momomiya

A returning move from Infinite Battle

but a bit more on Sonic 06's Green Gem.