I made it to the one way :3. Tho when I got to a the point where you enter the bulkhead into the 'basement', the rest of the world disappeared, forcing me to continue onward.
There was one room in the 1st part that no matter which key I got, it just wouldnt open.. it was in furthest locked office room. Kept saying I would need a special key despite having the nursery key, 2 master keys, and 2 mysterious keys.