Was the fact that she went to Eientei (or any other household) relevant to the case at all, as in can Suika really do this in just anywhere? (except that it allowed you to see it happening)
No
Was Suika playing some kind of game with herself?
No
Did she split her conscious?
No
There's no new posts so I suppose I should just edit in my questions:
Are the rooms....... mushrooms? :V
Are the rooms part of Suika?
Are the rooms in Suika's mind?
Do the rooms exist in reality?
Is Suika using a computer? (Eientei, Fanon Kaguya, NEET, chatrooms, computers there)
Better confirm what I think happened really happened.
Suika went to Eientei to ask for eight "rooms". She somehow (not physically) "entered" and "left" one letter in each room, the letters are A, E, I, K, N, O, S, U, because they spells out her name, ONESUIKA.