I am stuck on the presumably optional puzzle in the Repair Room in the Factory, to the point where I think it might be a bug. The solution seems to be to use a sequence of items with an object in the room. If I use what I think is the first item, nothing happens other than closing the item menu, and I still have the item. If I use anything else that I have, I get the same result as if I had used that item straight from my inventory, suggesting failure. I'd think that SOMETHING should happen when using that first item.
Edit: Oh right, using the items in the expected sequence (or others) also failed beyond the first item. That's important imformation I left out. Also, I had previously used some of those items in the puzzle in the room immediately following the room where those items are obtained, so I went back to the room where I got them and got new ones. That could matter.