The puzzle was simple enough, with some trial and error. The task was to form a check with the Queen by moving my Knight, in such a way that the Knight would check the King if it were to move. Clever, really.
Upon completing the piece, the side of the board popped out, revealing the key. No note, thankfully. I took the time to sleep, of course; once that was done, I unlocked the door, and placed the key into my pocket; I had four now. I walked back into the outside, and found myself on a rooftop, looking up at skyscrapers; they reached up to that dismal sky, as if trying to escape it. I looked up, and found myself returning to that... zone.
Perfect calm had returned to my heart once more. This place... I don't want to be anywhere else when I'm here. This place gives me a purpose of it's own.
But now that I am here... I feel something, like it is tugging at my mind. As if there was something that preyed on mind; I opened my eyes, and saw a door on that rooftop. A door that led nowhere.
This city is giving me drive. This city is giving me purpose. I will take that purpose, and I shall go. To the land beyond the door.