In Labyrinth, don't talk to Booster. Otherwise he'll vaporize. And you don't want that.
When you reach the Core, don't talk to Curly. Instead, go right and you'll see a shining thing. Pick that up.
Talk to Curly. And the boss will be triggered. Kill that thing. Water comes up and Curly's probably lying on the ground.
Interact with her, and it'll pop up "Do you want to use [DATA REDACTED]?". Choose yes.

When you reach the waterway, go in to the save point. Sleep in the bed (You gotta be tired after what you've been doing, right?).
Then check the computer. When you've done that, check the bookshelves. Then go check the bed.
She'll then ask if you want to leave her. You don't want that, press no. Then you're good to go until the Plantation.

Talk to Cthulhu. Then talk to Curly. Then Cthulhu. Go to Mimiga Village, and in the Cemetery. Go to "Ms. Mushroom" and talk to him.
Then she'll ask you some simple questions (Keep your sanity together! Take a break if you get confused!).
If you answered them correctly, you'll get a badge. Check it ASAP. When you've done that, talk to "Ms. Mushroom" again.
Then you'll pick up [DATA REDACTED]. Give that thing to Curly. Get back to the Plantation.

When you're going up to the Doctor again, go in the Prefab house. Sleep. Save. Death awaits.
When you've defeated everyone, go in to the Prefab house again.
There is a hole there. That wasn't there before (Duh).
And this is where the nightmare begins...