IDW Classic Sonic the Hedgehog (series), IDW Sonic Hub

An untitled IDW Classic Sonic the Hedgehog is rumored to be an upcoming series published by IDW Publishing that will feature and chronicle the adventures of Classic Sonic. It would be a spin-off of the main IDW Sonic the Hedgehog series. The series will first debut in the Sonic's 30th aniversary one-shot special, IDW Sonic the Hedgehog 30th Anniversary Free Comic Book Day 2021. Sonic the Hedgehog: 30th Anniversary Special ("Seasons of Chaos", "Sonic Learns to Drive", "Dr. Eggman's Birthday") IDW

Sonic the Hedgehog's 900th Adventure, IDW Sonic Hub

Sonic the Hedgehog: Imposter Syndrome Issue 2, IDW Sonic Hub

Mushroom Hill Zone (Classic)

Sonic the Hedgehog Encyclo-speed-ia by Flynn, Ian

IDW Sonic the Hedgehog Issue 50, IDW Sonic Hub

NEW LORE Explains How Sonic Prime & IDW Are Canon

Sonic the Hedgehog, IDW Sonic Hub

IDW Sonic the Hedgehog Issue 47, IDW Sonic Hub

Sonic The Hedgehog: Tails' 30th Anniversary Special