>>538136568
>Sonic Mars for the 32X was the original form of the project
The original was codenamed "Sonic-16" for Genesis and started development shortly after Sonic Spinball released. That one was even more straight-up SatAM universe: https://www.youtube.com/watch?v=Pnsn0_w6K9Q
Oh, and Sonic X-Treme released! Sort of. As a book set in the AOSTHverse. Other merchandise with the Sonic X-Treme trademark also released.
Pretty sure everyone knows this, but the Sonic Christmas Blast special was originally named "An X-Tremely Sonic Christmas" (which Sonic still says at the end since they didn't rerecord the line) and the Saturn version of Sonic 3D Blast was made to fill the holiday void of the game's cancelation.