Sonic Rush Adventure
Sonic in Coral Cave
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Coral Cave is part of a partially-submerged cave system with several underwater segments. It is similar to Quartz Quadrant, with coral replacing the gemstones and no sign of machinery.
The main "gimmick" of this zone is the mine cart. In Act 2, there are several mine cart sections where the player is only allowed to jump. Towards the end of Act 2, the mine cart falls into a dark, three-dimensional cavern. In this section, the player can turn left and right at forks in the track.
The boss of this zone is Ghost Kraken, with the battle taking place on a circular plane. The boss attacks using its tentacles and by spitting ink at the player. When its health reaches zero, it also fires ink at the screen. It can be damaged by attacking its tentacles. At times, Ghost Kraken pulls the playing field underwater, although the player isn't affected by this. However, the tentacles used to pull the field underwater flick the player away when they try to jump over or smash through them, effectively cornering the player in one part of the ring.