Underwater theme

Stages with an underwater theme have underwater areas, sometimes with underwater enemies. Usually, the player has a certain amount of time in the water, as Sonic can only hold his breath for so long. The only ways to keep Sonic from drowning are collecting bubbles of air and surfacing to collect oxygen.

Stages with an underwater theme

 * Chemical Plant Zone, Sonic the Hedgehog 2 (1992) - The Mega Mack is avoidable, but if not avoided, it can be considered an underwater area.
 * Aquatic Ruin Zone, Sonic the Hedgehog 2 (1992) - This zone has many underwater areas.
 * Carnival Night Zone, Sonic the Hedgehog 3 (1994) - This zone has an amusement park theme, but also includes underwater areas.
 * Ice Mountain Zone, Sonic Advance (2001) - This zone has underwater areas, but mainly incorporates the winter theme.
 * Aquarium Park, Sonic Colors (2010) - This is a very good example of a stage with an underwater theme.
 * White Park Zone, Sonic the Hedgehog 4: Episode II (2012) - This zone incorporates elements of the underwater theme, but winter elements predominate.