Sonic Mania's sequel was never developed due to Sega's concerns

Sonic Superstars is regarded as Mania's spiritual successor.

Sonic Origins developer very unhappy with Sega about state of the game

Sonic Origins developer isn't happy with the way Sega handled its release

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

Sega confirms Sonic 3 won't have its original music in Sonic Origins. Here's what will be missing, and why

Sonic Mania dev explains why a sequel didn't come above, discusses 2.5 experimental project

Sonic Superstars Had “a Slightly Weaker Start Than Anticipated” – Sega : r/pcgaming

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

Should We Have Concerns About 'Sonic Forces' After the Success of 'Sonic Mania?

GameInformer: Why Didn't Sonic Mania 2 Happen? : r/Games

Preview: 'Sonic Mania' is the lost Sonic game you always wanted – The Mercury News

Sega Lets Sonic Mania PC Fans Play Offline After DRM Backlash

Sega Reveals Why Sonic Superstars Was Made Over Sonic Mania 2

SEGA: Sonic Superstars had weaker start than anticipated

Press Pause Radio - Not Your Everyday Podcast - Late to the Party: Sonic Orgins