Admiral Jelly (サブマリンパイレーツ Sabumarin Pairētsu?, lit. Submarine Pirate) is a robot that made its first and only appearance in Sonic Colors's Aquarium Park serving as its boss. It was created by Dr. Eggman.
In the Wii version of the game, the player must swim to a giant glass dome with a lever inside. He/she will be followed by homing torpedoes, which must be used to break open the dome. Also, sometimes the white homing torpedoes have a Yellow Wisp inside them, which will be useful for the fight with Admiral Jelly. When the switch is activated, the player then faces Admiral Jelly. Admiral Jelly arrives with a bunch of pirates, and when he spins to the side, the player can use that time to destroy the pirates, and hit the Admiral when he is standing still. Admiral Jelly requires a maximum of three times to destroy him. If the player uses a Yellow Wisp from the torpedoes on the ship, the player can deal double damage. The only difference is that once the wisp is activated, Jelly will bolt off in a random direction at full speed, thus making it harder to hit him in drill mode, but a red arrow will point towards his direction, making it easier to find him. But when the player is chasing Admiral Jelly, he may change directions suddenly, so it is recommended that the player learn to use the drill boost at the correct times, in order not to waste it up all at one time.
The Admiral has the same appearance in the DS version of Sonic Colors. This time, he only uses two pirate minions to attack. Depending which side Sonic is on the platform, Jelly will turn his para-scope into a cannon and launch a minion onto the platform. Sonic must stomp the other side to hit Jelly with his minion. Jelly will fall, and Sonic must hit his head to deal some damage. If Sonic boosts into his head, he will gain the Cyan Laser Color Power to deal double damage. Jelly's attacks will get stronger, making it harder to hurt him in the second phase. The player must hit him until his health is at 0, then hit his head once more to kill him.
In both versions, Sonic must collect air bubbles to restore his breath.