Mario's Cap is the first item Luigi collects in the game. It is located in a washing machine inside of the Laundry Room. According to Luigi, he washes his cap by hand, while Mario washes his in a washing machine.
Mario strangely has two caps throughout the events of the entire game. The first cap he wears throughout the entire game, while the second is found by Luigi. It is possible the one Luigi picks up is a spare.
Mario's Glove is either the third, fourth, or fifth item that Luigi collects in the game. This item is located inside of the Projection Room after Luigi sucks all of the invisible Grabbing Ghosts into his Poltergust 3000. The glove is said to be a little sweaty when collected, but very sweaty when shown to Madame Clairvoya.
Mario's Letter is the second item that Luigi collects in the game. This item is located inside of a birdhouse at the Courtyard. When the item is given to Madame Clairvoya, the letter is said to say "L-O-O-K O-U-T F-O-R B-O-O-S, L-U-I-G-I!". Clairvoya sarcastically comments, "Not a novelist, your Mario."
Mario's Shoe is either the third, fourth, or fifth item that Luigi collects in the game. This item is located inside of The Twins' Room once Luigi sucks Henry and Orville in his Poltergust 3000. The shoe is said to have its sole torn and that it seems to have been walked in for hundreds of miles.
Mario's Star is either the third, fourth, or fifth item that Luigi collects in the game. This item is located on a floating platform at the Observatory after Luigi launches a Meteor Ghost to a moon and destroys it. A pathway then appears to lead Luigi to the platform.
- Strangely, Mario 's items are all equipped (Exluding the Star and Letter). They could also be spare.
- All of Mario's drop item are found in red chests expect for the Hat, Letter, and The Star.