- Marble Zone
The Underground explores the going through a marble like area, with a volcano looking like it's about to blow. After the Underground gets though the team finds a Chaos Emerald! But Sleet and Dingo beat them to the Emerald, and the volcano gets ready to blow and it does but Manic tells his brother and sister that the Emerald is a counterfeit. Sonic then christens the area the "Marble Zone", as they get away.
Sleet and Dingo return with the Red Chaos Emerald, but when Robotnik uses it to power a super mecha, the Fake Emerald blows.
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