Sonic Mania 2 was never in the works because Sega and its devs

The next 2D Sonic has “that old classic Sonic feel” but needed a “current look”.

Sonic Origins mod scrapped, modder says it's 'never coming back

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

Sonic Mania 2' Cancelled? Sega Reportedly Scrapped Sequel After 'Break Up' with Devs

Sonic Mania's sequel was never developed due to Sega's concerns over the size of its audience

Sonic Mania 2 Is Said to Have Been Scrapped Internally at Sega

Sonic Mania: Most Up-to-Date Encyclopedia, News & Reviews

SEGA and Sonic Mania developers explain the lack of Sonic Mania 2 - My Nintendo News

Sonic the Hedgehog: built upon nostalgia?, by Blue-kun

Sonic the Hedgehog (1991 video game) - Wikipedia

Is Sonic Mania The Game The Fans Wanted? - Green Man Gaming Blog

Sonic Superstars was originally set to be developed by the Mania team, Naoto Oshima now in charge of project

Review - Sonic Origins - WayTooManyGames

Why Sonic Superstars instead of Sonic Mania 2

Sonic Mania – the lost Saturn launch title? – Retro Faith

Sonic Mania Co-Developer Unhappy With Sonic Origins Implementation of Sonic 3 & Knuckles