Treasure Chest

Treasure Chests are an object in which one or more valuable items are contained. They appear in both Luigi's Mansion and Luigi's Mansion 3.

Luigi's Mansion
In Luigi's Mansion and its Nintendo 3DS remake, most rooms have their own Treasure Chest that appears once Luigi has vacuumed every ghost in the room (except for Boos). Treasure Chest come in five colors — blue, green, red, white, and gold — each containing different types of items. Luigi is required to open several Treasure Chests because most of them contain an item which is essential for him to continue progressing through the mansion. Unlike furniture that Luigi has opened in the room, an opened Treasure Chest remains as such if Luigi goes two or more rooms away before returning into the room with an opened chest. If Luigi leaves a room with a closed a Treasure Chest and then re-enters it, the game camera focuses on the Treasure Chest for a few seconds before zooming back out.

A Blue Treasure Chest always contains a Key that unlocks the door to a specific room. They are among the smallest type of Treasure Chest. Keys do not always spawn within a Blue Treasure Chest, as completing certain rooms such as the Wardrobe Room and Bathroom (1F) cause the Key to spawn by itself.

All Green Treasure Chests consist of treasure, with every one having coins and bills amongst them. Some also contain Gold Bars and Stones, and the one in the Hidden Room contains all three types of Stones, including a Red Stone, a Blue Stone, and a Green Stone. If Luigi defeats an optional portrait ghost, a Green Treasure Chest containing a Blue Diamond and other treasure spawns in the room.

Red Treasure Chests contain one of Mario's dropped Items. They are roughly the size of a Blue Treasure Chest, and Luigi is also required to open them to take Mario's Items to Madame Clairvoya.

There are three large Treasure Chests that each contain one of the Element Medals, and the color of these Treasure Chests each correspond to the element. The first one, found in the Mirror Room, contains the Fire Elemental Medal, and it has the same red color as the Treasure Chests containing Mario's items. The second one of these Treasure Chests, found in the Kitchen, contains the Water Elemental Medal, and it is colored blue. Lastly, the one in the Tea Room contains the Ice Element Medal, and it is the only Treasure Chest that is colored white. The first two of these Treasure Chests have the same appearance as their respective color counterpart, with the only difference being that they are larger.

After Luigi defeats an area's boss, he returns into the same room where he encountered the boss, and a gold-colored Treasure Chest spawns there alongside him. He must open it to obtain a special key that can open the path to the next area. An exception to this is the key to the Secret Altar, found in The Artist's Studio, where it instead spawns from a painting of a gold Treasure Chest, which automatically appears on the rightmost canvas after vacuuming up Vincent Van Gore.

Several dark red Treasure Chests are part of the furniture in both the Hidden Room and Sealed Room. They have a slightly different purpose of being part of the furniture. Some of them contain treasure, like the green Treasure Chests, whereas others contain ghosts while the room is dark. Both the Hidden Room and Sealed Room have a Treasure Chest containing a Speedy Spirit, although for the Hidden Room, this only occurs during the blackout. While the room is light, one of these Treasure Chests is a possible hiding spot for a Boo. Because they are furniture items, these Treasure Chests close after Luigi goes at least two rooms away before re-entering the room.

Luigi's Mansion 3
In Luigi's Mansion 3, treasure chests are found throughout the rooms in The Last Resort. They often contain treasure such as coins, bills, Gold Bars, and pearls. Some treasure chests are animated by Spirit Balls and turned into hostile possessed chests named Takarabako Obake. Luigi can turn a Takarabako Obake back into a regular treasure chest by either throwing an object into it or by having it chew on Gooigi and then removing the Spirit Balls with the Dark-Light Device. Doing so allows Luigi to obtain the contents within the treasure chest.