Sonic Rush Adventure
Coral Cave (コーラルケイブ Kōrarukeibu?) is the third stage of Sonic Rush Adventure. It takes place in a formerly submerge sea cavern located west of Southern Island in Blaze's world and the former resting place of the Jeweled Scepter. Red Material can be earned by completing this stage's Acts.
Coral Cave is a cyan grotto filled with crystalline coral forming purple surfaces, white paths, intertwining crystal- and coral bridges, and pristine pillars. The bottom of the grotto is partially flooded. Embedded in the ground are colorful gems that constantly twinkle from the light columns penetrating the ceiling. Decorating the surfaces are various colorful coral clusters and crystals. Other features include clean waterfalls and abandoned mining equipment, like pulleys, minecarts, mineshafts with lit torches and moving equipment.
Having risen Coral Cave from the sea, Sonic, Tails and Marine docked at the island to explore it, where they discovered footprints leading inside, prompting Marine to rush in. There, they found Captain Whisker and his crew as they were taking the Jeweled Scepter, who reveal themselves as the ones behind the hostile robots that the trio had met on their journey. Just as Marine enraged Whisker, Blaze appeared to protect the Jeweled Scepter. However, both Sonic and Blaze were left surprised to meet each other after their last adventure. No sooner, Whisker unleashed the Ghost Kraken on them.
While the Ghost Kraken kept Sonic and Blaze distracted, the pirates fled with the Jeweled Scepter, frustrating Blaze. As Sonic and Tails had Blaze explain the pirates and the scepter, they learned that they were in Blaze's world. Having told how they got there, Sonic and Tails joined up with Blaze to get the Jeweled Scepter back, while Marine made a scene to establish herself as the group's captain to Blaze.
An underwater-themed stage, Coral Cave has a few underwater sections, though they have no Air Bubbles, leaving the player at greater risk of drowning. The stage's main gimmick is the minecart, where the player rides a minecart through different sections. Towards the end of Act 2, the minecart falls into a dark, three-dimensional cavern where the player has to evade spikes and lava pits on the track.
Other exclusive gimmicks in Coral Cave include wooden arms that will take the characters to another elevation in the stage upon running into them, and gigantic shards of green crystal which launch the characters in the direction perpendicular to the surface touched. The latter enables Trick Actions upon being launched. Finally, there are rocks suspended on the ceiling with coral which can crush the characters should they land on them. Rocks held up by red coral can be knocked loose with attacks to the coral, while rocks held up by green coral fall down on their own.
In Coral Cave, the Bungee Rope gimmick takes the appearance of a huge mechanical pulley with a hook. Uniquely to them, the player can grind on the first section of them, during which the player can perform Grind Tricks.
The boss of Coral Cave is Ghost Kraken, a giant robot octopus. It can be fought after clearing Coral Cave Act 2. On the first time however, the player can only fight it with Sonic the Hedgehog.
In battle, the Ghost Kraken will use its tentacles to attack the player in different formations or corner the characters. Other times, it will shoot ink to obscure the player or submerge the entire arena. To defeat the Ghost Kraken, the player has to hit its jeweled tentacle until it health is depleted and land the final blow.
- Coral Cave is similar to the past timeline of Quartz Quadrant from Sonic the Hedgehog CD, with coral replacing the quartz and no signs of machinery besides the enemy robots.