Sonic the Hedgehog 4
Sonic the Hedgehog 4 is a video game in the Sonic series and serves as a sequel to Sonic 3 & Knuckles. It was released over 2 episodes.
 Episode I
 Episode II
In late December 2011 the first information emerged regarding Episode II with a short teaser trailer showing the return of Sonic alongside Tails, and Metal Sonic as the main antagonist. The game also features local and online co-op with 2 players controlling Sonic and Tails, and the introduction of co-op techniques.
- Sylvania Castle Zone
- White Park Zone
- Oil Desert Zone
- Sky Fortress Zone
- Death Egg mk.II Zone
- Special Zone
 Episode Metal
Announced shortly after Episode II, Episode Metal is a bonus episode featuring Metal Sonic as the playable character and 4 extra levels. It was included as a free bonus for players who purchased both episode I and II. The episode consists of 4 acts which, whilst not named as such, are updates of levels seen in previous games.
Music from the game features in the following CD soundtracks:
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