List of realms
- Metru Nui
- Matoran Universe
- Dream World
- Spirit Realm
- The One Hundred Dimensions
- 999999999979 other unknown realms.
Despite being of different worlds, the realms have multiple passageways and networks that can be used to access each other, with some forming naturally, and others having to be conjured.
- There are hidden ladders lead up to about 16 doors each floor, in total 62500000000 floors.
- The Living Side is the main realm and can be reached only using apparition or the Realm Crystal, retrieved from the Tomb of the First Spinjitzu Master.
- There is conflicting information about the exact number of realms there are. Some information indicates one trillion including the Living Side, and others state that there one trillion beyond Earth, which would mean there are one trillion and one realms in total. The latest official information about the subject states that there are indeed one trillion, including Earth.
- As seen with the destruction of the Cursed Realm, destroying a realm consequently destroys its sister realm; in this case Djinjago.
- Time passes differently in some realms, explaining how the Sky Pirates stayed alive for 200 years from Ninjago's perspective while being trapped in other realms.
- Wu referred to the realms as the "Lands of Creation," implying that they may have some affiliation, or were created by the elemental essence of Creation.
- The zoetrope room is similar to the entrance chamber of the Department of Mysteries. Both are circular rooms surrounded by doors, and both have a bluish glow.
- The Hageman Brothers came up with the idea of the realms.
- It is unknown whether the Cloud Kingdom affects Chima or other realms, whether residents of realms besides Ninjago go to the Departed Realm upon death, or whether disgraced warriors from realms other than Ninjago go to the Underworld.
- The Digiverse is not a realm.
- When asked if the other realms would eventually fall as the Cursed Realm and Djinjago had, Tommy Andreasen replied, "There is an end to everything. Facts of life." This implies that ultimately all the realms will be destroyed or become uninhabitable.
- It is currently unknown whether all realms will ever be shown, because "stuff like that needs to happen organically."