Some of the empty tiles on the visible edges 'connect' to filled/blocked tiles in the neighboring room. (perhaps there should be another outer layer that is completely cut off by the window, but the visible tiles (8X5) appear to be fully intact)
Thanks for the feedback. I assume you are talking about the room above the first lightswitch/dark room? I've been thinking about a solution to this for the sequel but haven't found something that works well, as of yet.