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.

Sonic the Hedgehog 4 Episode II

Sonic the Hedgehog 4: Episode II (2012) - MobyGames

Sonic 4 Is 2D and Episodic

Sonic the Hedgehog 4: Episode 1 News - GameSpot

Sonic the Hedgehog 4: Episode 1 Review - GameSpot

Sonic 4 Episode 1 » SEGAbits - #1 Source for SEGA News

Sonic 4 Episode 3 Was Planned By Sega But Was Cancelled - My

Wah wah wah Sonic the Hedgehog 4! – Destructoid

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

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