a small theory
Chapter 7 spoilers
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what if Idia's beta game version of Twisted wonderland was the past version of the one we're playing right now?
What if that in future occasions, Yuu or mc IS able to travel between worlds and is able to return to their world and by that time idia's game got popular with the stories he based on mc's experience in the night raven school and he started selling his games in other worlds including mc or OUR world?? Maybe thats why we know about this game, maybe that forth wall breaking part of idia WAS intentional for this purpose