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Level 243.6 is one of the four transitional hallway associate levels. From here, it is a yellow tinted greenhouse, where one large window shows you Level 243, though, you cannot enter such level. The ones in Level 243 can also see you through there, of course, like any other greenhouse, there is a plethora of flora growing, and multiple tables with a single chair. Some of these tables contain potted plants, and there is a bookshelf against one of the walls.
You can go through or back, the connections being Level 244 and the Glitch Zone.
Before the exit to the glitch zone, if you've entered all other three transitional hallway associate levels, then a door will appear that goes to Level 246.
The Glitch Zone is a small sub-area that appears to be a small black void which has an invisible path to walk on, it contains multiple factors from Level 244 and Level 245 but glitched out. Simply go forward and past a construction sign floating to enter Level 243.8 and then eventually Level 241.
Go down a descending flight of stairs in Level 244.
You can enter the Glitch Zone from Level 243.8.
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