It is out that a number of Sonic Games are available and playable on the Next-Gen console: XBOX Series X. This Post will list them below.[Sidenote: For PlayStation 5 it should be kinda the same thing, since it is possible to play the very most games available in the PlayStation Store or in your PSN accounts library but at the moment i can’t provide a confirmation of that yet.]
Sonic Games that are confirmed to be available and playable:
Sonic the Hedgehog 1, 2, 3, 3&K, CD, 4E1, 4E2, Sonic the Fighters
Sonic Adventure, Sonic Adventure 2
Sonic Unleashed, Sonic Generations
Sonic & All-Stars Racing Transformed, Team Sonic Racing
Sonic Mania Plus, Sonic Forces
SEGA Collab games like SEGA Superstar Tennis as well as Sonic & SEGA All-Stars Racing, Sonic Free Riders and others seem to be not available.