Underground theme

Stages with an underground theme features a setting based at an underground cavern area. They can sometimes share similarities with the ancient ruins theme.

Stages with an underground theme

 * Mystic Cave Zone, Sonic the Hedgehog 2 (1992)
 * Hidden Palace Zone, Sonic the Hedgehog 2 (Beta) (1992/2013) - This zone also incorporates elements of the ancient ruins theme and underwater theme.
 * Hidden Palace Zone, Sonic & Knuckles (1994) - Although sharing the same name, it does not have an underwater theme.
 * Windy Hill, Sonic Lost World (2013) - Mainly predominates in Zone 3.