Classic Sonic back to his dimension after the events of Sonic Forces. He discovers Eggman is collecting the Chaos Emeralds and already has four of them. Sonic must gather all the Chaos Emeralds before Eggman.

Sonic Mania Adventures is a 2D cartoon animated series released for free on YouTube over the course of 2018, The series serves as a continuation of Sonic Mania, After the ending of Sonic Forces, Sonic is back to his dimension and then he discovers that Dr. Eggman is collecting the Chaos Emeralds and already has four of them, Now Sonic must gather all the Chaos Emeralds before Eggman and save Green Hill Zone once again.—AhmedDaReviewer

This series serves as a continuation of Sonic Mania. Classic Sonic returns to his dimension after the events of Sonic Forces. Sonic reuniting with his friends and defeating Robotnik. Robotnik is basically trying to find the chaos emeralds while Sonic has 1 emerald, and a few characters have other emeralds.

Sonic Mania Adventures is a 2D animated series created by SEGA serving as a continuation of Sonic Mania. After the events of Sonic Forces, Classic Sonic returns back to his dimension after one big adventure in Modern Sonic's dimension. He finds Dr. Eggman with 4 chaos emeralds. Sonic has to collect all the emeralds before Eggman could.—angelaramirezdegomez