By the way, found this quote about Little Garden upper levels (3+).
"Although the 4-Digit or higher Gates on Little Garden are visually parallel to each other, but the truth is, each of them is connected to an independent universe. Consequently, the rulers of the Gates are free to decide the definition of Time, hence, the concept of "Proper Time" didn't exist, but now they can't do anything but to be bound if it is necessary for the conclusion of the Sun Sovereignty War."
More proof of Little Garden being a Multiverse. Now Fuji, Shiroyasha talked about Astral Gate being teleportation.
Shiro: "Everyone will step into separate worlds once they pass the gate! It is also one of a few convenient Gifts in Little Garden. That is the Boundary Gate (Astral Gate) which allows spatial teleportation!"
Sun: "The Astral Gate is the reason why we can maintain business within this absurdly vast Little Garden."
Shiro: "[Astral] is the word refers to the stars. Once you stepped through this gate, you will be separated from the Material World and turned into an Astral Body and can travel across worlds like the starlight."
Sun: "In Theosophy, Astral Body was treated as the unknown energy emanated from the soul and the mind."
Shiro: "A little incorrect, but fundamentally correct."
Sun: "Then, I will leave it to you to make it simpler."
Shiro: "Okay. If I have to make it easier for other to understand, the Astral Body would be a type of Anywhere Doo......"
Sun: "Hey, stop speaking nonsense."
Shiro: "Otto, sorry for that."