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 I (Game) - Giant Bomb

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Sonic 4 » SEGAbits - #1 Source for SEGA News

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

Sonic the Hedgehog 4: Episode 1 Review - GameSpot

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Sonic the Hedgehog 4: Episode I — Вікіпедія

Sonic the Hedgehog 4 goes episodic this summer - GameSpot

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

Sonic the Hedgehog 4: Episode 1 - Game - Nintendo World Report

Sonic the Hedgehog 4: Episode II, Sonic Wiki Zone

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

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