The Storage Room is a location in Luigi's Mansion and its Nintendo 3DS version.
Description[]
The rightmost area of the Storage Room has a stack of red chairs and several wooden crates. A bucket and mop is nearby, and a mirror is placed between them on the wall. A red button can be seen in the reflection of the mirror, and pressing it causes the left wall to slide back a distance, revealing another part of the Storage Room. Before the wall is moved, the pole of the broom leans against it, but after the wall moves, the broom lies on the ground.
The other portion of the Storage Room, revealed after the wall moves, has a closed hatched, and on the wall behind it is a red button covered by a poster.
In Luigi's Mansion[]

The Boos are freed from the Storage Room in Luigi's Mansion
The door to the Storage Room is on the right end of the Ball Room, but Luigi has to first obtain the key to unlock it by defeating the Ghost Guys and The Floating Whirlindas in the Ball Room.
In the Storage Room, Luigi has to vacuum up a Purple Puncher and two red Grabbing Ghosts. He can optionally also reveal a Speedy Spirit by examining a chair placed against the wall on the right side. Once the lights turn on, Luigi can press the button shown in the mirror for the left wall to move back. The button only activates when the light turns on, and pressing it again does nothing. At the left side, Luigi has to vacuum a smaller poster into the Poltergust 3000 and press the red button behind it. By doing this, a group of fifty Boos and King Boo are all released from the hatch and escape to different rooms of the mansion. Following this, Luigi gets a call on his Game Boy Horror from E. Gadd, who asks him to briefly return to the Lab, mainly to talk about the Boo Radar function that can detect the location of any Boo present in the same room as Luigi.
During the blackout, the Storage Room has two Purple Punchers and two Gold Ghosts. Luigi is also given another chance to capture the Speedy Spirit if he had not done so prior.
In the PAL Hidden Mansion, there are three Gold Ghosts, four Garbage Can Ghosts, and two Blue Twirlers.