Sonic Origins got help from the Sonic Mania team

The Sonic Origins developer is actually the Sonic Mania team at Headcannon, at least partly - even as fans continue to complain about the strange pre-order DLC

Sonic Mania review

Sonic Mania review

SEGA's Sonic Mania and More Come to Origin Access Premier

Sonic Mania races to EA Origin Access Premier

Sonic Origins overview trailer - Gematsu

Sonic Origins review --- The past never looked so bright — GAMINGTREND

Sonic Mania and Sonic PLUS

Why Didn't Sonic Mania 2 Happen? - Game Informer

Playable Amy is great, but Sonic Origins Plus is pointless if it doesn't address the original's problems

Sonic Mania studio confirms they are working on Origins Plus

Sonic CD VS Sonic Mania:: Which is Better? – The Power Team – iRetroGamer Rewind

Sonic Origins Plus, Sonic Wiki Zone