Very mild body horror.

Equipment

Equipment for Sid and Efina is hidden in a few places in the mansion.
You can get these as soon as you reach them.

Silly:
Go upstairs before the incident begins, and check the left table for some Funny Glasses.

Weapons:
Serrated Knife and Small Donut, found on second floor, fourth room from the left, in the trash can by the desk.

Armor:
Big Liar and Dragon Aura, found on second floor, fifth room from the left, in the top-middle trash can.

Overpowered Weapons:
Legendary Knife and Legendary Cookie, found on second floor, fifth room from the left, behind the bottom-left boxes.

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First Floor

Enter the center door and talk to Wilbur at the top.

Go back out and find Enos in the top-left corner. Return to the grand hall and talk to him.

Talk to Iris after she shows up. Then talk to Wilbur.

Talk to Enos and fight the lie, then talk to him again.

Go out and check the entrance door, then return and talk to Iris. Go upstairs.

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Second Floor

Try to go upstairs.

Enter the third door from the left and check the eye.

Go to the leftmost door and talk to the maids.
Then talk to each individually to hear their stories.

(Note: Everything in this section must be done in a fixed order.
If you try to look for something you aren't supposed to find until later, you won't find anything.)

Enter the second door from the left and check the trash can for a medicine bag.
Show the medicine bag to the blue-haired maid (second from left).

Enter the fourth door from the left and check the closet.
Check under the nearby table for the key, then open it to find a maid uniform.
Show it to the maid with braids (leftmost).

Enter the second door from the left and check the message that appears on the wall.

Enter the fifth door from the left and check behind the trash can on the middle-right for photos.
Show the photos to the ponytail maid (third from left), then the bob cut maid (rightmost).

Talk to Iris in the hall.
Enter the fourth door from the left and check the closet again for medicine.
Show Iris the medicine.

Enter the second door from the left, check the crumpled paper, then the memo pad next to it to rewrite the note.

Talk to the maids one last time.

Once that's straightened out, you can fight the eye in the third room from the left.

After fighting the eye, proceed to the third floor.

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Third Floor

After the fight, enter the door. Get the note from the right table and check the mirror.
Enter the code into the lock on the left: 8018

After opening the lock, walk down toward where you came in.

Take Neil into the left door on the right side.
Push the weights forward by holding the Check button and moving toward them.
Eat the lock at the end.

Take Brett into the door on the left.
Each section has a correct "warp" to the next section (going counter-clockwise).
The others take you back one, so you need to remember which is right in each section.
The path is: top-left, top-right, top-left, top-left, bottom-left, top-right, top-right.
Eat the lock at the end.

Take Iris into the right door on the left side.
Check the darkness, and she'll show you the way.
Eat the lock at the end.

After returning to the main room, heal in the bed one last time
if you need to, then go out.

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Endings

The endings branch after you go up to the fourth floor.

Bad Ending

As Teo, just keep going forward.
The boss will be unbeatable.

Normal Ending

Go into the eye in the hallway as Teo (check it twice).
The boss will then be beatable.

Happy Ending

In addition to going into the eye as Teo, Efina must be level 12 or higher.
This is checked when you go onto the rooftop, so you can fight the last lie before that repeatedly to level up.
If you want access to free healing, your last chance is after you leave the three dragons, but before you go to the fourth floor.