[@The One]

Contained chart of what everyone faced in the maze, comparisons to notes Arken gave during the introductions, descriptions given of each creature, notable phrases or words the masked man used in the maze, things he couldn't know but did anyway, theories extended from that. Isabella and her being sealed is still very much a mystery, she must have some ability to directly interferes with his abilities or an aspect of his plans,  but quite a lot has become clear. I.E. I believe he has the ability to see the future in a limited aspect- take Keith and the goo Dragon- the masked man prepared a suitable for that would challenge Keith's perceived weaknesses, however he was not able prepare for the flame ability that Keith possessed that melted the goo dragon. 

There is also the case of Rika, the demon transformed him into his demonic form , yet Argentina was able to calm his emotions. I believe the masked man wanted Rika transformed to negotiate with his demonic half yet did not predict Argentina's emotional calming somewhat foiling his plans. Therefore it seems viable that he was able to predict when we would all choose to enter the maze, but for unknown reasons, was unable to see how events would change with his interference. 

It sorta goes on like that with more evidence and different theories. I am attempting to puzzle it out through Leval's perspective so I am only using the evidence that Leval has had access too- i.e. Not what has gone down in masked mans lair, or specific individuals power sheets. A lot of it will be in post, which I don't think I can really type out on my phone