This category is for levels with layouts qualified for the Underground theme. These stages revolve around caverns, mines and other places beneath the ground.
To add an article to this category, put [[Category:Underground theme]] in that article.
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Hidden Palace Zone (Sonic the Hedgehog 2) -
Quartz Quadrant -
Hidden Palace Zone -
Tidal Tempest -
Hydrocity Zone -
Aquatic Mine -
Mystic Cave Zone -
Green Hill (Sonic Generations)
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