Challenge the questions above if you wish, then examine the following for tantalizing trivia. Highlight the void below each query to discover the answer.

Per Lemmy Koopa:
"King Boo and I can be spotted in more than one room."
Shivers
"I'm sitting on a money ghost, but you won't be able to find it until two areas from now."
Melody
"You can't catch me until the next area."
Madame Clairvoya
"In the Hidden Mansion I can cause 40 damage in one shot."
Biff
"You won't find any ghost besides me in this room, not even any kind of Boo."
Miss Petunia
"When you beat me you'll earn 5,000 dollars."
King Boo
"If you're lucky you could catch the two of us at once."
Henry and Orville
"I definitely wasn't here the last time you came to this room."
Uncle Grimmly
"If you were born dead, you'd be cranky too."
Chauncey
"There is no need to enter the room I am in. Lucky for me, Mr. Grimmly isn't here."
Sue
Name all the portrait ghosts that could honestly say this: "This is the first and only thing you've heard me say out loud."
Shivers, The Floating Whirlindas, Mr. Luggs, Spooky, Bogmire, Biff, Nana, Miss Petunia, Slim Bankshot, Uncle Grimmly, Clockwork Soldiers

Per Ludwig 222:
Name the only room with water ghosts.
Safari Room
Which room has two golden mice?
Tea Room
How many pillars are on the Roof?
12
During the blackout, which three rooms have blue ghosts that drop money if you catch them?
Hidden Room, Conservatory, Nursery
How many barrels are in the Breaker Room?
11
Which is the most valuable? A: Ruby B: Red Diamond C: Emerald D: Sapphire
A, Ruby
If you add together the HP of all the Boos in the Basement (other than King Boo), what number do you get?
750
During the blackout, how many Shy Guys are in Astral Hall?
6
How can you defeat the red bomb ghosts?
Spray water on it.
In Cold Storage, how many icicles are on the ceiling?
7
How many ghosts are in the Sealed Room?
4
How much power does Boomerang have?
300
Name the five rooms with a wedge of cheese.
Fortune teller's room, Dining Room, Tea Room, Study, Safari Room
Name the six rooms with a ghost that, if vacuumed up, gives out lots of money.
Wardrobe Room, Dining Room, Kitchen, Billiards Room, Rec Room, Breaker Room
What color gem is on the chandelier in the Secret Altar?
Blue
Where do you find Mario's shoe?
Twin's Room
Which room lets you gain access to the Hidden Room?
Butler's Room
What color treasure chest is in the Cellar?
Green
Name the two rooms with fire ghosts.
Washroom (second floor), Sitting Room

Per Bowser Koopa V:
In order of appearance, how many ghosts are optional?
Mr. Luggs, Biff Atlas, Slim Bankshot, Sue Pea, Jarvis

Per crankymama5452:
How many times in Area 1 must you enter the Parlor?
3: one in the beginning, one when you go through to the Antiroom, and one on your way back.
Who is the first optional Portrait Ghost you can catch?
Mr. Luggs
For reasons other than Boo catching, do you ever return to the Wardrobe Room?
Yes.
Which is the first area where you are capable of seeing Mario in the painting?
Area 3

Per MammaMia64:
How many rooms are there in the mansion that you cannot reach via a door?
3 - The Graveyard, the Hidden Room, and the Sealed Room
How many Boos make up Boolossus?
15
How many variations are there of Luigi calling for Mario?
20, the ones you hear vary depending on Luigi's health, sounding more scared with less health
How many different kinds of ghosts (excluding gallery ghosts and elementals) can be found outside?
5 - Ceiling Surprise, Purple Bomber, Flying Fish, Bat, and Mr. Bones
How many gallery ghosts have unknown ages?
6 - In order: The Floating Whirlindas, Bogmire, Boolossus, Clockwork Soldiers, Jarvis, King Boo