The Interloper (no ontology)
From Mazeworld
MazeWorld is located in an area referred to as The Interloper, as a reference to the statement the GMs make when referring to the Mazes' location.
Explanation of the term
"MazeWorld, the World between All Worlds, the Interloper of the Universes, through which anything that exists in any universe can come through. And we are the only ones to decide exactly what comes through and what doesn't." ~ Sergey Kovrov
Not much is known about the Interloper other than it is, in a metaphysical way, the theoretical area that is there between all universes in all planes of existence. Per se, it doesn't exist in any given universe, but a fraction does exist in every universe, in the form of gates, through which beings, life forms, souls, objects, resources, and just about anything else can be transited out of their original worlds and into that of the Mazes, via the GMs' intervention.
This area has, for evident reasons, no actual name, and it is only referred as such by the GMs and particularly Sergey, who has given that name to the realm in which the Mazes are located, when asked what MazeWorld is by contestants. It is possible that it is simply yet another confusing trick from the GMs to disorient the contestant, though several clues point out to this affirmation being truth, most notably the presence of creatures commonly referred to as being mythological or fantastic creatures, from multiple supposed myths and lores, all concentrated in one same realm.
It is never confirmed whether or not the Mazes are indeed "between all universes", or if it is simply in its own one, and it seems that the GMs themselves do not even know, or possibly refuse to tell, or are even incapable of explaining it in words, as a concept that could only truly be understood by beings of their stature.
