Episode I sees Sonic traveling through four main zones: Splash Hill, Casino Street, Lost Labyrinth and Mad Gear, facing against Dr. Eggman as he reuses and enhances some of his old creations and contraptions, culminating in a battle in his E.G.G. Station. If the game is finished with all seven Chaos Emeralds collected, a post-credits cutscene is shown, teasing the audience with the appearance of Metal Sonic as a character to appear in the next episode.
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