| NiGHTS: Journey of Dreams|
Aqua Garden, also known as the Dream of Ocean, is the first dream of Helen Cartwright in NiGHTS: Journey of Dreams. It is a vibrant, oceanic world with gigantic bubbles and fish flying through the air. The boss for this level is Girania. It is where Helen's White Ideya is hidden.
Helen climbs the chain on NiGHTS' cage in order to dualize with him/her and chase after the Goodles riding peacock-like birds in pink, blue, and green in order to get their key and unlock the three NiGHTS cages. This is the mission where players can paraloop Nightopians and Nightmarens into their My Dream world. Once all of the cages have been opened, the player will be sent to battle Girania for the first time.
Helen and NiGHTS are challenged by Owl to push the giant bubbles into the bubble in the center Aqua Sphere and make it bigger. When the time runs out, the mission ends.
Octopaw makes his first appearance to Helen, whom NiGHTS challenges to make a link of 25 with the rings and blue chips Octopaw releases. The player gets five chances to make the necessary links to pass. Links of four or under, however, do not count as a fail.
Wizeman creates a tornado and sends Helen flying down into a deep ocean trench. In this mission, the player only plays as Helen and attempts to reach NiGHTS at the top of the trench before the Awakers come to wake Helen up and cause a Night Over. The mission ends when Helen successfully reaches NiGHTS.
This is the final mission of Aqua Garden, where the player must once again battle Girania, who is noticeably bigger this time. Once again, NiGHTS must ram into Girania to break him up into multicolored spheres. NiGHTS can then use a paraloop to suck in as many spheres as possible in the limited amount of time before he reassembles. Sometimes, Girania will burrow into the ground and the player must the wait until he resurfaces. If the player gets into Girania's mouth, they will be swallowed and deal five seconds' worth of damage. Once he is defeated, the player gains the White Ideya of Purity, the Dolphin Persona, and access to the second world, Crystal Castle.
- Aqua Garden is the only Helen level to be based on an Elliot level.
- This world appears in Sega Superstars Tennis as the NiGHTS tennis court.