The characters battle on a downsized version of the mansion that appeared in Luigi's Mansion. The mansion's interior rooms will be visible when the characters pass through the mansion's outer walls; similarly, when all of the fighters are outside of the mansion, the mansion's exterior is shown, although this is only if all four quadrants of the building are still intact. By attacking the support pillars, the mansion crumbles section by section until it is all gone. Due to its supernatural origins, though, it will rebuild itself back to its original status after a while. Unlike the destructible towers on Shadow Moses Island, it is impossible to destroy a quarter of the stage if another is on top of it.
As the pillars are able to be attacked, projectile users can have problems hitting enemies when they are on either side of them (there are some exceptions like R.O.B.'s Robo Beam). Captain Falcon's Raptor Boost, Luigi's Green Missile, Ike's Quick Draw, Pikachu's Skull Bash, and Jigglypuff's Rollout can also can have problems because of this. Players can also use this to their advantage as refuge from such attacks. Notably, the bottom pillars can only be broken if their corresponding upper pillar is broken first; a bottom pillar still has an active hurtbox, but can never be broken unless its top pillar is broken first.
Important properties of the stage are that the mansion provides three levels to brawl on: the ground floor, the second floor and the roof. The roof is the only plain that can be jumped and dropped through - with the exception of a small piece in the center, the middle level has a thickened floor which cannot be penetrated by characters, attacks or items. When the mansion is broken apart completely, the stage layout distinctly resembles Final Destination, with the addition of two minuscule platforms on either side. The platforms rise and fall alternately, much like the ones featured in the Stage Builder, but strangely enough, they can disappear and re-appear at random. It is also impossible to glide underneath the stage because the mansion seems to be on top of a small pillar.
When playing this stage with more than four players, the pillars lose their hitboxes, rendering the mansion impossible to demolish. This also provides more freedom for projectile users and characters with rushing moves as the pillars no longer hamper these attacks.
The Omega form is set on the roof of the mansion. Its interior is no longer accessible, thus, it can no longer be destroyed. Star KOs can occur.
In Brawl tournaments, Luigi's Mansion has progressively become a banned stage. This is due to its walls which prevent opponents from DIing out of certain multi-hit moves and, as they are solid from all directions, create relevant caves of life and introduce the potential for circle camping. The columns also stop projectiles, limiting approach options for characters which rely on them.
When it was legal in more areas, Luigi's Mansion was considered to be one of the best stages for Olimar (due to Olimar being able to survive much longer than normal and use up smashes as well as techs), R.O.B. (due to being able to use down smash and Robo Beam better), and Lucario (due to being able to survive long helping the Aura property). It was also one of the top Meta Knight stages and one of the best Falco and Snake counterpick stages.
This stage used to be a major counterpick on the West Coast and in the Midwest, while it was banned on the East Coast. Its potential for circle camping also led to it being banned more often than being a counterpick in tournaments. It is currently a Group Three counterpick according to the Smash Back Room, though its legality is still considered in question by many.
The mansion made its first appearance in Luigi's Mansion, where it is the primary location that Luigi wanders in. In Luigi's Mansion, the mansion is overrun by ghosts and Luigi must get rid of them with the Poltergust 3000. The mansion is made up of many different rooms. The five rooms that appear in this stage in Smash include:
Also in Luigi's Mansion are tombstones and wilted trees outside the mansion. This is also true in Smash. In the area behind the mansion in Luigi's Mansion called the Courtyard there is a well. Luigi can go to the Bottom of the Well where Luigi finds out the location of Mario. In Smash, a well can be seen on the foreground in front of the mansion.