Sonic the Hedgehog 4 goes episodic this summer - GameSpot

Project Needlemouse revealed as side-scrolling sequel to speedster's original Genesis trilogy; Episode 1 confirmed for Wii, Xbox 360, PS3.
Sonic is back for his fourth installment in the classic 2D series, revamped from the ground up.

The Sonic 4 Cycle – A Retrospective – Source Gaming

Sonic the Hedgehog 4: Episode 1 - First Look - GameSpot

Sonic the Hedgehog 4: Episode 1 - First Look - GameSpot

Sonic the Hedgehog 4: Episode I - Wikipedia

Sonic the Hedgehog 4 Episode I

Sonic the Hedgehog 4: Episode I (Game) - Giant Bomb

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

Editing Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech

Sonic the Hedgehog 4: Episode II, Sonic Wiki Zone

Sonic Mania Review Thread : r/Games