Hidden Room

The Hidden Room (Japanese: 隠し部屋 Secret Room) is an optional room found in Area Two of Luigi's Mansion. It can be accessed by inspecting the mouse hole in the Butler's Room with the Game Boy Horror, activating a warp that will suck Luigi through said hole.

Story
After a bit of a rough landing, Luigi finds himself in the Hidden Room. This room is full of treasure chests, and the plumber begins opening them. The plumber is caught off guard, however, when he discovers a Flash ghost inside one of the chests. Using the Fire Element function on his Poltergust 3000, Luigi is able to defeat the apparition. Luigi hopes that was the only ghost in the room. No such luck, however, as the ghost-hunter has to capture three more Flash ghosts before the room brightens. When it does, Luigi notices three chests still unopened. He raids them all, and inside one of them is a Blue Jewel, a Green Jewel and a Red Jewel. Luigi rejoices at his good fortune, and after celebrating, he uses the same mousehole to transport him back into the Butler's Room.

Description
The Hidden Room is a small room with many treasure chests. Eight of them to be exact, including the one Luigi receives for brightening the room. The room's floor and walls are golden and as such the entire room sparkles with gold dust, like the Sealed Room. During the Blackout, one can come back here and capture a Speedy Spirit. Two vases are also located in the room (which are worth checking), as well as a mirror on the south wall that can be seen with the Game Boy Horror.

In the PAL Hidden Mansion, Luigi will find Shy Guy Ghosts instead of Flashes.

Ghosts in The Hidden Room during the blackout

 * One Grabbing Ghost (10 HP)
 * Two Blue Twirlers (30 HP each)
 * Bats
 * One Speedy Spirit (10 HP)

Trivia

 * This is the 3rd room with bats, the others being stairs and hallways.
 * If Luigi enters the room without first capturing a Fire Elemental Ghost, he cannot leave unless the player entirely quits the game.