The Sonic Mania studio helped work on Sonic Origins – Destructoid

There is now a Sonic Mania studio Sonic Origins connection - Headcannon has confirmed their involvement with Origins.

The Nerd Nest - A Video Game Podcast

X-এ Destructoid: Sonic Mania is all the proof I needed that Joy-Con need a D-pad / X

Sonic Mania Dev Confirms Involvement With Sonic Origins

SONIC ORIGINS VS SONIC MANIA Comparison - Sonic The Hedgehog ACT 1 Graphics Comparison

Sonic Origins Mania Project Sonic and Sega Retro Forums

List of Sonic the Hedgehog characters - Wikipedia

Sonic the Hedgehog (1991 video game) - Wikipedia

Sonic Origins Mania Project Sonic and Sega Retro Forums

Dev Game Club

Review: Sonic Forces – Destructoid