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I didn't make a whole lot of progress yesterday thanks to being extremely stuck in the initial chase scene with The Girl (which is what the monster I referenced in my last post is called). I think I might have encountered some kind of glitch since the sequence of events didn't match up with what articles were describing, so I'll describe what I did in case it's helpful.

I was at the section where Grace needed to get the screwdriver. I will note, I was pretty low on health at this point, and things weren't going great. XD Now, I had already moved the cart in and been chased around by The Girl twice, and apparently that meant the little hideaway structure was supposed to have disappeared. It hadn't, though, so I think that's where things were getting confused.

( Instructions on the puzzle... )

( Level discussion and spoilers... )

( Grace theory, continued... )