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{{species infobox
|image=[[File:Big Boo SM3DW Prima.jpg|200px]]<br>Artwork from ''[[Super Mario 3D World]]''
|first_appearance=''[[Super Mario World]]'' ([[List of games by date#1990|1990]])
|latest_appearance=''[[Super Mario RPG (Nintendo Switch)|Super Mario RPG]]'' ([[Nintendo Switch]]) ([[List of games by date#2023|2023]])
|variant_of=[[Boo]]
|variants=[[Balloon Boo]]<br>[[Big Frame Boo]]<br>[[Boohemoth]]<br>[[Gold Big Boo]]<br>[[Mad Big Boo]]<br>[[Mega Boo]]
|notable={{fake link|Big Boo (''Super Mario 64'' character)}}<br>[[Bigger Boo]]<br>[[Boolossus]]<br>[[King Boo]] (''[[Super Mario 64 DS]]''-onward)<br>[[Spooky Speedster]]
}}
'''Big Boos''', also known as '''Atomic Boos''', are a species of [[Boo]]. Usually, they resemble and behave similarly to normal Boos, except they are larger and stronger.
==History==
===''Super Mario'' series===
====''Super Mario World''====
[[File:BigBoo SMW.png|frame|left|The Big Boo]]
[[File:Donut Secret House SMW.png|thumb|[[Small Mario]] fights the Big Boo boss in the hidden path of the Donut Secret House.]]
The Big Boos (formatted as '''The Big “Boo”''' in-game) first appear in ''[[Super Mario World]]''. In the game, Big Boos inhabit the various [[Ghost House]]s located around [[Dinosaur Land]]. They first appear in the [[Donut Secret House]]. They are four times bigger than a normal Boo in both height and width, but they still have the same mannerisms of their smaller counterparts, meaning that when looked at, they hide behind their arms, occasionally peeking to see if they are still being looked at. However, if [[Mario]]'s or [[Luigi]]'s back is turned, a Big Boo attacks him from behind.

In the game, Big Boos are much more difficult to pass than their smaller brethren. As such, Mario or Luigi usually has to use a [[trampoline|Jumping Board]] to [[jump]] over them. However, if Mario or Luigi can get a [[dash|running]] start, he can usually [[Spin Jump|spin-jump]] over a Big Boo. Additionally, if there is room, the brothers can use a [[Cape Feather|Cape]] to [[fly]] over a Big Boo or perform a sliding attack during descent to defeat the Big Boo.

In [[Super Nintendo Entertainment System|Super NES]]-era [[Nintendo Power|Player's Guide]]s, the Big Boo enemy is known as '''Big Blue Boo'''<ref>M. Arakawa. Nintendo ''Mario Mania'' Player's Guide. Page 51.</ref><ref>M. Arakawa. Nintendo ''Super NES'' Player's Guide. Page 15.</ref> to differentiate from the Big Boo boss.<ref>M. Arakawa. Nintendo ''Mario Mania'' Player's Guide. Pages 72-73.</ref><ref>M. Arakawa. Nintendo ''Super NES'' Player's Guide. Page 12.</ref>

The Big Boo boss is a hidden encounter of the Donut Secret House. This Big Boo does not hide when Mario or Luigi is facing it, but it periodically changes from invisible to visible. It can be defeated by throwing [[Grab Block]]s at its face while it is visible. This boss does not damage Mario or Luigi, but two normal Boos accompany it. Once the Big Boo is defeated, a new path is revealed on the overworld, leading to [[Star World]]. Unlike the [[Koopalings]] and [[Reznor]]s, the Big Boo can be refought in all versions of the game.

During development, when "Boo" Buddies were still referred to as "Boo" Diddlys, the name for the Big "Boo" was originally going to be localized as "Boo" Jackson, a reference to multi-sport athlete {{wp|Bo Jackson}}.<ref>TCRF. [[tcrf:Prerelease:Super Mario World (SNES)/Background Graphics and Tilemaps#Enemy Cast List|Prerelease:Super Mario World (SNES)/Background Graphics and Tilemaps#Enemy Cast List]]. ''The Cutting Room Floor''. Retrieved August 6, 2020.</ref>

====''Super Mario 64'' / ''Super Mario 64 DS''====
''See also:'' {{fake link|Big Boo (''Super Mario 64'' character)}}<br>
In ''[[Super Mario 64]]'', a Big Boo appears in [[Peach's Castle]], leading Mario to the [[courtyard (Peach's Castle)|courtyard]]. In the courtyard itself, it can be found in one of the corners, appearing slightly larger than the other Boos. If Mario defeats it, it drops a birdcase (also misidentified as a "carousel"<ref>M. Arakawa. ''Super Mario 64'' Player's Guide. Page 48.</ref>) leading to [[Big Boo's Haunt]]. {{fake link|A much larger Big Boo character}} appears in the course itself as the owner of the mansion and leader of the Boos. In ''[[Super Mario 64 DS]]'', [[King Boo]] is also added and referred to as "Big Boo" as well.

====''Super Mario Sunshine''====
[[File:Sleepy Boo.jpg|thumb]]
In ''[[Super Mario Sunshine]]'', Big Boos.<ref>Loe, Casey. ''Super Mario Sunshine'' Perfect Guide. Page 81.</ref><ref>[https://www.nintendo.co.jp/character/mario/archives/sunshine/index.html?lang=en English ''Super Mario Sunshine'' entry on the official Mario Portal]. ''nintendo.co.jp''. Retrieved August 13, 2022. ([https://archive.ph/aHGom Archived] on August 13, 2022, 22:22:41 UTC via archive.today.)</ref> also known as '''Sleepy Boos'''<ref>Hodgson, David S J, Bryan Stratton, and Stephen Stratton. ''Super Mario Sunshine'' Prima's Official Strategy Guide. Page 20.</ref> or '''Giant Boos''',<ref>Loe, Casey. ''Super Mario Sunshine'' Perfect Guide. Page 76.</ref> appear as obstructive enemies only defeatable by [[Yoshi]]. During Episode 3 of [[Sirena Beach]], [[Mysterious Hotel Delfino]], [[Mario]] encounters them in [[Hotel Delfino]].

Big Boos are stationed in various passages; most of the Big Boos appear in the hotel's attic, and one is also located on the second floor of the hotel, blocking the sole passage between two rooms. There is no room to pass or [[jump]] over them, and [[F.L.U.D.D.|FLUDD]] has no effect. Though they do not wake up in response to anything, they will do one point of damage to Mario if he makes contact. The only way to defeat a Big Boo and clear the way is for a Yoshi to eat it. If Mario is riding on a Yoshi's back and runs into a Big Boo, he will be flung off the Yoshi as usual; however, it is very hard for Mario to mount the Yoshi again afterward, as he will still be too close to the Big Boo and Mario will very likely be knocked off again. 

Additionally, the Golden Boo in [[The Hotel Lobby's Secret|Episode 2]] of [[Sirena Beach]] is also described as a Giant Boo statue.<ref>Loe, Casey. ''Super Mario Sunshine'' Perfect Guide. Page 79.</ref> The boss from ''Super Mario 64'' appears again, now localized as King Boo.

====''Super Mario Advance 4: Super Mario Bros. 3''====
In ''[[Super Mario Advance 4: Super Mario Bros. 3]]'', a Big Boo appears in the first room of the [[World-e]] level [[Vexing Doors]]. The ''Super Mario World'' boss also appears at the end of the level, as well as a previous level, [[Doors o' Plenty]]. Unlike in ''Super Mario World'', however, the Big Boo can damage the brothers while he is solid. Also, the brothers cannot kick blocks upward and must instead [[jump]] to the Big Boo's level to kick blocks at him in midair. While Mario or Luigi must use [[White Block]]s instead of Grab Blocks, the method of defeating the Big Boo remains the same as in ''Super Mario World''. 

The [[List of Super Mario Advance 4: Super Mario Bros. 3 pre-release and unused content|unused]] sprites in the game show the ''[[Super Mario World 2: Yoshi's Island]]'' iteration of the enemy, specifically using alternate sprites that were likewise unused in the source.

====''Super Mario Galaxy''====
[[File:Boo Box.png|thumb|The Atomic Boo in ''Super Mario Galaxy'']]
In ''[[Super Mario Galaxy]]'', one Atomic Boo appears in the "[[Boo in a Box]]" mission. It uses a model separate from the regular Boo (labeled "TeresaChief"; compare "[[Big Goomba|KuriboChief]]"), but the object is scaled at nearly one-third its native size in the game itself. Despite this, it is still visibly bigger than regular Boos. The Atomic Boo must be lured into the light to defeat it and obtain its [[Power Star]].

An individual Atomic Boo named the [[Spooky Speedster]] is found in two areas of the game. Mario must race him twice to win a Power Star: once in the [[Ghostly Galaxy]] and once again in the [[Boo's Boneyard Galaxy]].

====''New Super Mario Bros. Wii''====
[[File:Big Boo NSMBW Screenshot.png|150px|thumb|left|Big Boos as they appear in ''New Super Mario Bros. Wii'']]
[[File:NSMBW Big Boo Model.png|50px|thumb|A Big Boo]]
Big Boos reappear in the game ''[[New Super Mario Bros. Wii]]'', and act much like they do in ''[[Super Mario World]]''. They can only be encountered in [[Ghost House]]s, and are usually seen with many smaller [[Boo]]s. Unlike regular Boos, a Big Boo does not stop attacking unless every player is facing it, unless there are 4 players, in which case, only 3 need to face it.
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====''Super Mario Galaxy 2''====
[[File:Boos and Big Boo SMG2.png|thumb|200px|The [[Mega Boo]] and four Big Boos in ''Super Mario Galaxy 2'']]
In ''[[Super Mario Galaxy 2]]'', four Big Boos make an appearance accompanying the [[Mega Boo]] in the [[Haunty Halls Galaxy]]. This time, they use a downscaled version of the Mega Boo's model model (labeled "TeresaAtomic"). The version of Atomic Boo from ''Super Mario Galaxy'' is an [[list of Super Mario Galaxy 2 pre-release and unused content|unused leftover]] with its model deleted from the game data.
{{br|left}}

====''Super Mario 3D Land''====
These gigantic Boos reappear in ''[[Super Mario 3D Land]]'', where they behave similarly to their ''New Super Mario Bros. Wii'' counterparts. They appear in a few [[Ghost House]]s. Sometimes, if Mario is very far away from the Big Boo and looks in the opposite direction, it floats away instead of drifting towards him.

====''New Super Mario Bros. 2''====
[[File:NSMB2 Gold Big Boo.png|thumb|left|A Gold Big Boo leaving a trail of coins.]]
Big Boos reappear in the [[Ghost House]]s of ''[[New Super Mario Bros. 2]]''. They can be turned into [[Gold Big Boo]]s by passing through a [[Gold Ring]]. While in their golden form, they cover their faces and leave a trail of [[coin]]s behind them for Mario to take. Whenever it covers its face, the Big Boo glows red, while it radiates a dark shadow around it once Mario stops staring at it.

This game introduces a new type of Big Boo known as [[Boohemoth]].
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====''New Super Mario Bros. U''====
Big Boos reappear in the [[Wii U]] title ''[[New Super Mario Bros. U]]'', once again only appearing in [[Ghost House]]s. Nothing changes about their behavior, but if the player looks at a Big Boo they will begin to sweat.

====''Super Mario 3D World'' / ''Super Mario 3D World + Bowser's Fury''====
[[File:Shiftier Boo Mansion.jpg|thumb|Big Boo in ''Super Mario 3D World'']]
Big Boos also appear in ''[[Super Mario 3D World]]'' and its [[Nintendo Switch]] port ''[[Super Mario 3D World + Bowser's Fury]]'' with the same behavior of ''Super Mario 3D Land''. Some can be seen outside the windows in [[Ghost House]]s watching the player, but these Big Boos do not do anything special. Big Boos can now be defeated by [[Light Box]]es, leaving coins.

====''Super Mario Maker'' / ''Super Mario Maker for Nintendo 3DS'' / ''Super Mario Maker 2''====
Big Boos reappear in ''[[Super Mario Maker]]'', ''[[Super Mario Maker for Nintendo 3DS]]'', and ''[[Super Mario Maker 2]]''. The player can enlarge a normal Boo with a [[Super Mushroom]], transforming it into a Big Boo although being slightly smaller than in other games, similar to the ''Yoshi's Island'' games. The player can also give them wings which make them slightly faster. They can also be put in Clown Cars, Lakitu's Cloud and on tracks.
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===''Super Mario World'' television series===
[[File:CartoonBooTwo.png|thumb|left|A Big Boo, with three Boos, from the ''Super Mario World'' episode "Ghosts 'R' Us".]]
Big Boos appeared in two episodes of the [[Super Mario World (television series)|''Super Mario World'']] animated series. In the episode "[[Ghosts 'R' Us]]", [[Yoshi]], while exploring [[Wizenheimer]]'s [[Ghost House|haunted house]], encounters a Big Boo and three regular Boos. Terrified of the Boos, Yoshi proceeds to run away in a panic as the four ghosts give chase. After running some time through the haunted house and losing the three regular Boos, Yoshi manages to trick the Big Boo into entering a vacant room. With the Big Boo apparently trapped in this room, Yoshi locks the door. Unfortunately, the Big Boo simply phases through the wall and resumes chasing Yoshi. Yoshi eventually escapes his Big Boo tormentor by fleeing into the basement of the haunted house.

In ''Super Mario World'''s final episode, "[[Mama Luigi]]", a Big Boo is seen acting as a guard to [[Bowser's Castle|Neon Castle]], likely a misinterpretation of [[Bowser]] in the [[Koopa Clown Car]] flying over it in the game's map. Mario, Luigi and Yoshi easily sneak past this Big Boo guard by using a nearby [[Warp Pipe|Warp Tube]], which leads to the basement of Neon Castle.
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===''Super Mario Adventures''===
[[File:SMABigBoo.gif|thumb|The Big Boo trying to sneak up on Mario and Luigi while Boos distract them.]]
An unnamed Big Boo was also featured prominently in the ''[[Super Mario Adventures]]'' comic by ''[[Nintendo Power]]''. After being lured into a Ghost House, Mario and Luigi, after an encounter with several dozen Boos, encounter a Big Boo. Attempting to stare down this Big Boo and the swarm of Boos, Mario and Luigi become exhausted after hours of simply staring at the shy ghosts. Nearly collapsing of exhaustion, Mario spots a door and, dragging Luigi, dashes to it, with the Boos and Big Boos after him. Bursting through the door of the room Mario and Luigi just entered, the Big Boo and his Boo minions are surprised to see Mario [[Dr. Mario|dressed as a doctor]], with Luigi as his nurse. Acting as a psychiatrist, Mario manages to learn that, as a child, this Big Boo was constantly bullied, which led to its vicious behavior. After hearing this Big Boo's sad tale, Mario gives some helpful words of wisdom and advice. The Big Boo, having become a changed ghost through Mario's therapy, happily leads Mario out of the Ghost House and gratefully thanks him as Mario, Luigi, and Yoshi take-off to [[Bowser's Castle]]. Another Big Boo was later seen among the attendees to [[Bowser]]'s wedding to the brainwashed [[Princess Peach|Princess Toadstool]].

===''Yoshi'' franchise===
====''Yoshi's Safari''====
The Big Boo appears as the boss of the level [[Ghost Mansion]] in ''[[Yoshi's Safari]]'', Mario must shoot it with the [[Super Scope]] as he makes parts of the wall fall down on him. Later the Boo separates into three [[Boo Buddies|Circling Boo Buddies]]. Mario must shoot the one with his tongue out to win.

====''Yoshi's Island'' series====
[[File:Boo.gif|frame]]
In ''[[Super Mario World 2: Yoshi's Island]]'', they appear in many [[Tower]]s and [[Castle]]s. However, in this game, they are only twice as large a normal Boo in height and width, making them half as large as the ones in ''Super Mario World''. Like normal Boos, they could only be defeated by looking away from the ghost and bouncing an egg off a wall, hitting the ghost in the face. They release [[Star (Yoshi's Island series)|Star]]s when defeated. Additionally, one of the bosses, [[Bigger Boo]], starts as a normal Big Boo before being transformed by Kamek's magic.

Big Boos also appear as enemies in both sequels, ''[[Yoshi's Island DS]]'' and ''[[Yoshi's New Island]]'', acting no differently than in ''Super Mario World 2: Yoshi's Island''.

====''Yoshi Topsy-Turvy''====
[[File:YTT - Boo Screenshot.png|frame|Yoshi with several [[Boo]]s and Big Boos in Mission 6-7.]]
In ''[[Yoshi Topsy-Turvy]]'', Big Boos appear in the [[Tale of the Spirit of Kindness]] and the [[Tale of the Spirit of Fright]]. They are much more common than the smaller Boos, which are only in the latter.

===''Hotel Mario''===
[[File:HM Big Boo.png|thumb]]
In ''[[Hotel Mario]]'', Big Boos first appear in [[Ludwig's Thump Castle Hotel]] and are powerful enemies, being about one-sixth the size of a hotel floor, but are slower than normal Boos. Big Boos in this game attack in a manner similar to the ones of ''Super Mario World'', slowly floating towards Mario or Luigi when they look away, stopping and hiding behind their arms when directly looked at. Unlike the game's normal Boos, they are never transparent. When the player character is in a room or elevator, the Big Boo will lose track of them and wander in simple diagonal movements with a slightly confused expression.

===''Super Mario RPG: Legend of the Seven Stars''===
[[File:Terrorize.png|thumb|Big Boo as seen in ''Super Mario RPG: Legend of the Seven Stars'', in [[Bowser]]'s [[Terrorize]] move]]
In ''[[Super Mario RPG: Legend of the Seven Stars]]'', one Big Boo has a cameo appearance in this game. It is used in [[Bowser]]'s [[Terrorize]] attack.<ref>''Super Mario RPG: Legend of the Seven Stars'' English instruction booklet, page 41.</ref> While there is an enemy called "The Big Boo", it is in fact a misnamed regular Boo.

===''Game & Watch Gallery 4''===
[[File:G&WG4 Luigi Boxing Big Boo.png|frame|Big Boo fighting Luigi during a boxing match in ''Game & Watch Gallery 4'']]
Big Boo is an opponent in the Modern version of ''[[Boxing]]'' from ''[[Game & Watch Gallery 4]]''. He is [[Luigi]]'s second opponent. However, instead of boxing gloves, Big Boo uses smaller Boos to pummel his opponent.

If the player selects the game yet waits several seconds, a humorous animation will play. Specifically, several [[Waluigi]]s pop up from the floor, and Big Boo throws his boxing glove Boo at them in a similar manner to a bowling ball, and is overjoyed at getting a strike.

===''Mario Party-e''===
In ''[[Mario Party-e]]'', a Big Boo appears in [[Bolt from Boo]], where two players must outrun it. If it catches Mario, the game is over. It uses its sprite from ''Super Mario World''.

===''Paper Mario'' series===
====''Paper Mario: The Thousand-Year Door''====
Atomic Boos make their ''[[Paper Mario (series)|Paper Mario]]'' series debut in ''[[Paper Mario: The Thousand-Year Door]]'', with a single one appearing as an optional mini-boss in [[Creepy Steeple]]. It closely resembles the sprite of [[Bigger Boo]], similar to how normal Boos in this game are based on its artwork. This Atomic Boo is composed of approximately two hundred different Boos. Mario can only fight it by going to the [[Creepy Steeple]] after freeing the 200 Boos in Chapter 4 (if he guesses the number right, a Boo gives him an [[Ultra Mushroom|Ultra Shroom]]). Even though Mario agrees to be nice to the Boos, they swarm him as soon as they are free. If Mario disperses those Boos a few times with the spin ability of his [[Super Hammer]], the Boos combine together to form the Atomic Boo.

The Atomic Boo attacks by flinging Boos at Mario, charging up a powerful glare attack, hiding his face and becoming invisible like regular Boos, floating over and falling onto both Mario and his partner, and inflicting Mario with status ailments such as confusion and paralysis. In the battle with Atomic Boo, Mario's [[audience]] consists of solely Boos. Once Atomic Boo is defeated, it drops the [[Lucky Start]] [[badge]] that Mario can collect, and the Boos stop their swarming, appearing as normal enemies.

A graphic of a [[Dark Boo|Dark]] version of Atomic Boo is [[List of Paper Mario: The Thousand-Year Door pre-release and unused content|unused]]. It is reasonable to assume that it would have been a more powerful version of Atomic Boo.

It is possible for the Lucky Start badge to drop down the hole revealed by pushing the star statue. If this happens, the badge can be purchased from the [[Lovely Howz of Badges]] for 70 coins.<ref>Alpharad (Mach 5, 2016). [https://youtu.be/xkQxt5tibM8?t=1296 "Shower Scene" | Paper Mario: TTYD – Stream Highlights #5]. ''YouTube''. Retrieved August 1, 2017; originally retrieved March 7, 2016 on the [[Big Boo (Paper Mario series)]] page.</ref>

It is also worth noting that, despite being made of 200 Boos, it is still smaller than [[Boolossus]], which is made of only fifteen. The Big Boo of ''[[Luigi's Mansion: Dark Moon]]'', however, is roughly the same size as the Atomic Boo, and is made from ten Boos.

====''Super Paper Mario''====
Atomic Boos appear infrequently in ''[[Super Paper Mario]]''. Only one appears in [[Merlee's Mansion]], where it is considerably weaker than the one encountered previously. This Atomic Boo attacks the player by charging at them while they are facing away from them, turning intangible if it is faced. As such, it attacks like the Big Boos of the ''Super Mario'' series, albeit somewhat slower than usual, as well as being susceptible to jumps. Multiple Atomic Boos occasionally appear in the [[Mansion Patrol]] [[minigame]]; though slower than regular Boos. Defeating one gives many more points than defeating a regular Boo.
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====''Paper Mario: Sticker Star''====
In ''[[Paper Mario: Sticker Star]]'', the enemy is referred to as Big Boo, and it looks like a large, crumpled paper ball with a Boo face to go with the game's paper motif. The Big Boo only appears once in the entire game and is a mini-boss found in [[World 4 (Paper Mario: Sticker Star)|World 4]]. It is formed when [[Kamek]] combines the Boos found in [[the Enigmansion]]. 

In battle, the Big Boo's only attack is eating Mario and then spitting him out. However, once the Big Boo uses its turn, the candles light up and the Big Boo turns invisible. During this time, Mario is unable to attack the Big Boo, but the Big Boo is still able to hurt Mario. In order to make the mini-boss visible again, a [[Sticker#Things|Thing sticker]] with wind or water properties needs to be used in order to extinguish the candles. However, using a Thing sticker with fire properties such as [[Matches]] and [[Lighter]] while the candle is put out relights it. Although the Big Boo is invisible while the candle is lit, it can still take damage from [[Spike Helmet]] or [[Poison Mushroom]].

Once the Big Boo has been defeated, the [[Book of Sealing]] stays on its pedestal and the mansion is free of ghosts.
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===''Super Princess Peach''===
[[File:SPPBigBoo.png|thumb|The Big Boo from ''Super Princess Peach'']]
Big Boos also appear in ''[[Super Princess Peach]]'', where they retain their behaviors from ''[[Super Mario World]]''. Unlike normal Boos, they are invincible. In [[Shriek Mansion]] [[Shriek Mansion 3-3|3-3]], there is one particular Big Boo that is initially locked in a cage. Princess Peach must release that Big Boo from the cage by hitting a nearby [[! Block]] and then lure it into a ray of light that stuns the Big Boo, after which it becomes harmless and can be used as a platform.

This game also introduces a Big Boo species affected by the [[Rage]] [[vibe]], the [[Mad Big Boo]]. Like normal [[Mad Boo]]s, they stay still when Peach turns away from one, and chases after her when she looks at it.
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===''Mario Golf: World Tour'' / ''Mario Sports Superstars''===
In ''[[Mario Golf: World Tour]]'' and ''[[Mario Sports Superstars]]'', whenever [[Boo]] gets an [[Eagle]], [[Albatross]], or [[Hole-in-One]], the animation shows multiple Boos who mix it in to form a Big Boo.

===''Captain Toad: Treasure Tracker''===
Big Boos reappear in ''[[Captain Toad: Treasure Tracker]]'' and its Nintendo Switch and Nintendo 3DS [[Captain Toad: Treasure Tracker (Nintendo Switch / Nintendo 3DS)|ports]] with only a few tweaks from ''[[Super Mario 3D World]]''. While they act the same by following a Toad when they are not being watched, they are far less a threat due to the headlamp [[Captain Toad]] and [[Toadette]] have, which can destroy them. Additionally, using a [[Double Cherry]] to shine two headlamps on a Big Boo will defeat it much faster, within one second. To compensate for this, Big Boos generally appear in groups of two or more.

===''Mario & Luigi'' series===
====''Mario & Luigi: Superstar Saga + Bowser's Minions''====
[[File:MLSSBMBigBoo.png|thumb]]
Big Boos appear in ''[[Mario & Luigi: Superstar Saga + Bowser's Minions]]'', where they are enemies and recruitable allies found in ''Minion Quest: The Search for Bowser''. They are flying troopers, and attack by running into enemies. Their [[Special Skill (Mario & Luigi series)|Special Skill]], Piercing Projectile, allows them to spit a blue beam at an enemy. Big Boos are slow, but have high HP and power. Their model bears a resemblance to [[King Boo]]'s appearance from ''[[Mario & Luigi: Paper Jam]]''.

====''Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey''====
Big Boos reappear in ''[[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey]]'', where they are enemies and recruitable allies found in ''Bowser Jr.'s Journey''. However, the player can only befriend a maximum of two, meaning that the player would have to get rid of one of them after completing a level that involves them as enemy troops.

===''Mario Tennis Aces''===
A Big Boo appears in ''[[Mario Tennis Aces]]'' as the referee in [[Mirage Mansion]].

===''WarioWare: Move It!''===
Big Boo makes its first ''[[WarioWare (series)|WarioWare]]'' appearance in Level 3 of the [[Mario Pinball Land (microgame)|Mario Pinball Land]] [[microgame]] in ''[[WarioWare: Move It!]]'' It must be defeated to win the microgame.

==Profiles and statistics==
===''Super Mario World''===
*'''''Super Mario World'' instruction booklet:''' ''You may remember the Boo Buddies from [[Super Mario Bros. 3]]. This time there's a whole horde of them! And amongst them there's a huge spook called The Big Boo. But don't worry, if you look at them, they act shy and turn away. Cute, aren't they? But watch it ... they're dangerous!''<ref>''Super Mario World'' instruction booklet, pg. 24''</ref>

===''[[Perfect Ban Mario Character Daijiten]]''===
'''<big>アトミックテレサ</big><br>
'''{{ruby|種族|しゅぞく}}'''　ゴースト族<br>
'''{{ruby|性格|せいかく}}'''　気が小さい<br>
'''{{ruby|登場|とうじょう}}ゲーム'''　ワールド<br>
'''<big>大きさトップクラスのテレサ</big><br>
たくさんのテレサ（P116）が合体したオバケで、マリオキャラの中でも1、2を争う大きさ。性格はテレサと同じく照れ屋なので、顔が合えば顔を隠して止まってしまう。<ref name=Daijiten>Shogakukan. 1994.「パーフェクト版 マリオキャラクター大事典」 (''Perfect Ban Mario Character Daijiten''), [https://i.imgur.com/dv0Bi9S.jpeg page 38].</ref>

'''''<big>Big Boo</big>'''''<br>
''Tribe: Ghost clan''<br>
''Disposition: Faint-hearted''<br>
''Game appearances: World''<br>
'''''<big>Top class size Boo</big><br>
''He is an obake that is a combination of many Boos (P116) and is one or two of the largest Mario characters. His personality is shy like Boo, so if his face meets hers, he will stop and hide his face.''

===''Yoshi's Island'' series===
====''Super Mario World 2: Yoshi's Island''====
*'''[[Player's Guide]]:''' ''Just like a monster in the movies, Big Boos like to sneak up from behind when Yoshi's not looking.''<ref>Miller, Kent, and Terry Munson. ''Super Mario World 2: Yoshi's Island'' Player's Guide. {{media link|SMW2 Guide 126.jpg|Page 126}}.</ref>

====''Yoshi's New Island''====
*'''Shogakukan guide:''' 通常の何倍もの大きさのテレサ。テレサと同じように、ヨッシーと向き合うと動かなくなり、背を向けると近づいてくる。背を向け、反射でタマゴをぶつけて倒そう。<ref name=YNI/>(''A Boo many times larger than a normal one. Like Boo, it will stop moving when facing Yoshi, and will come closer when you turn your back to it. Turn your back on it, and use your reflexes to hit it with an egg to knock it down.'')

===''Paper Mario'' series===
====''Paper Mario: The Thousand-Year Door''====
{{:Paper Mario: The Thousand-Year Door bestiary|transcludesection=Atomic Boo|align=horizontal|image=[[File:Atomic_Boo.png]]}}

====''Super Paper Mario''====
{{:Super Paper Mario bestiary|transcludesection=Atomic Boo|align=horizontal}}

====''Paper Mario: Sticker Star''====
{{:Paper Mario: Sticker Star bestiary|transcludesection=Big Boo|align=horizontal}}

===''Super Princess Peach''===
;[[Super Princess Peach#Enemies|Glossary]] profile
*'''47''': ''A giant Boo. Still as shy as ever.''

===''Mario & Luigi'' series===
====''Mario & Luigi: Superstar Saga + Bowser's Minions''====
*'''''Minion Quest: The Search for Bowser'' profile:''' ''A big ol' Boo. It's slow, but it flies and has incredible HP and POW.''<br>

====''Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey''====
*'''''Bowser Jr.'s Journey'' profile:''' ''An incredibly large Boo. What it lacks in speed it more than makes up for in stamina and power.''

==Gallery==
{{main-gallery}}
<gallery>
TheBigBooHiddingL.gif|A Big Boo being bashful from ''[[Super Mario World]]''
SMS Asset Model Sleepy Boo.png|''[[Super Mario Sunshine]]''
BooMPE.png|''[[Mario Party-e]]''
Boo Island DS.jpg|''[[Yoshi Topsy-Turvy]]''
BigBooSM3DL.png|''[[Super Mario 3D Land]]''
PDSMBE-BigBoo-TeamImage.png|''[[Puzzle & Dragons: Super Mario Bros. Edition]]''
</gallery>

==Additional names==
===Internal names===
{{internal names
|game1=''[[Super Mario Galaxy]]''
|file1=<tt>ObjectData/TeresaChief.arc</tt>
|name1=TeresaChief
|meaning1=Transliteration of below
|game2=''Super Mario Galaxy''
|file2=<tt>StageData/ObjNameTable.arc/ObjNameTable.tbl</tt>
|name2=テレサチーフ (''Teresa Chīfu'')
|meaning2=Boo Chief
}}

===Names in other languages===
{{foreign names
|Jap=アトミック・テレサ<ref>[https://www.nintendo.co.jp/clvs/manuals/ja/pdf/CLV-P-VAAAJ.pdf ''Super Mario World'' Japanese instruction booklet], characters section</ref> / アトミックテレサ
|JapR=Atomikku Teresa
|JapM=Atomic Boo <small>(mostly ''Super Mario World'' to ''Super Paper Mario'')</small>, also romanized as "Atomic Telesa"</small>
|Jap2=ビッグテレサ<ref>''Super Mario RPG'' Japanese instruction booklet, page 41.</ref>
|Jap2R=Biggu Teresa
|Jap2M=Big Boo <small>(''Super Mario RPG'')</small>
|Jap3=デブテレサ<ref>Shogakukan. 「スーパーマリオサンシャイン任天堂公式ガイドブック」 (''Super Mario Sunshine Nintendo Kōshiki Guidebook''). [https://i.imgur.com/63brkWn.jpg Page 20.]</ref>
|Jap3R=Debu Teresa
|Jap3M=Fat Boo
|Jap4=大きなテレサ <small>(''Super Mario Sunshine'')</small>
|Jap4R=Ōkina Teresa
|Jap4M=Large Boo <small>(''Dance Dance Revolution: Mario Mix'')</small>
|Jap5=テレサ（{{ruby|大|だい}}）<ref>「ヨッシーアイランドDS任天堂公式ガイドブック」 (''Yoshi's Island DS Nintendo Kōshiki Guidebook''), [[media:YIDS Shogakukan P22.jpg|page 22]]. 「テレサ（{{ruby|大|だい}}・{{ruby|小|しょう}}）」</ref>
|Jap5R=Teresa (Dai)
|Jap5M=Boo (Big) <small>(''Yoshi's Island DS'')</small>
|Jap6=でかテレサ<ref>Shogakukan. 2015. ''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'', ''New Super Mario Bros. Wii'' section, page 145.</ref><ref>Shogakukan. 2015. ''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'', ''Super Mario 3D Land'' section, page 180.</ref><ref>Shogakukan. 2015. ''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'', ''New Super Mario Bros. 2'' section, page 195.</ref><ref>Shogakukan. 2015. ''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'', ''New Super Mario Bros. U'' section, page 210.</ref><ref>Shogakukan. 2015. ''Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook'', ''Super Mario 3D World'' section, page 226.</ref><ref name=YNI>「ヨッシー New アイランド 任天堂公式ガイドブック」 (''Yoshi's New Island Nintendo Kōshiki Guidebook''). {{media link|Yoshi New Island Shogakukan P21.jpg|Page 21}}.</ref>
|Jap6R=Deka Teresa
|Jap6M=Big Boo <small>(mostly ''New Super Mario Bros. Wii'' to current)</small>
|SpaA=Gran Boo<br/>Gran Bú <small>(2010-2017)</small>
|SpaAM=Big Boo
|SpaE=Gran Boo<br>Boo Atómico
|SpaEM=Big Boo<br>Atomic Boo <small>(''Paper Mario: The Thousand-Year Door'' / ''Super Paper Mario'')</small>
|Fra=Maxi-Boo<br/>Boo Atomique<br/>Gros Boo<ref>''[[Super Mario Bros. Encyclopedia|Super Mario Encyclopedia]]'', pag. 99</ref><br>Big Boo<ref>[http://www.oldiesrising.com/noticespdfV2/Philips%20CDi/Hotel%20Mario.pdf French ''Hotel Mario'' instruction booklet], page 9.</ref><ref>[https://drive.google.com/file/d/10U71A5B_bWOUf55wXE9g9D6FbP878wdx/view Yoshi Safari instruction booklet, french section] page 20.</ref>
|FraM=From "Maxi-" (most) and "Boo"<br/>Atomic Boo <small>(''Paper Mario: The Thousand-Year Door'' / ''Super Princess Peach'' / ''Super Paper Mario'')</small><br/>Big Boo <small>(''Super Mario World'', ''Super Mario Sunshine'')</small><br>Big Boo
|Dut=Reuze-Boo
|DutM=Giant Boo
|Ger=Riesen-Buu-Huu<br>Big Buu<br>Schlafender Buu Huu<br>Atom-Buu<br>Maxi-Buu
|GerM=Giant Boo<small>(''Super Mario World'')</small><br>Big Boo<br>Sleeping Boo <small>(''Super Mario Sunshine'')</small><br>Atom Boo <small>(''Paper Mario: The Thousand-Year Door'' / ''Super Paper Mario'')</small><br>Big Boo <small>(newer games)</small>
|Ita=Il Re Boo<br>Grande Boo<br>Boo gigante<br>Boo Assonnato<ref>[https://drive.google.com/file/d/1rUoKMl3eOmB--MrQZqNMxAwoAiitfeuF/view Prima Guide; pag. 20]</ref><br>Boo dormiglione<ref>''[[Super Mario Bros. Encyclopedia|Super Mario Bros. Enciclopedia]]''; pag 99</ref>
|ItaM=The King Boo <small>(''Super Mario World'' boss)</small><br>Big Boo (used for the bosses)<br>Giant Boo (for the enemies)<br>Sleepy Boo <small>(''Super Mario Sunshine'')</small><br>Sleepyhead Boo <small>(''Super Mario Sunshine'')</small>
|Por=Grande Bu
|PorM=Big Boo
|Kor=아토믹부끄
|KorR=Atomik Bukkeu
|KorM=Atomic Boo <small>(''Super Paper Mario'')</small>
|ChiS=强力嘘嘘鬼<ref>无敌阿尔宙斯 (August 28, 2013). [http://tieba.baidu.com/p/2560204606 神游 超级马力欧世界 敌人官译]. ''Baidu Tieba''. Retrieved February 2, 2017.</ref> <small>(''Super Mario World: Super Mario Advance 2'')</small><br>''Qiánglì Xūxūguǐ''<br>巨型嘘嘘鬼<ref>https://www.ique.com/3ds/arej/screenshot/index.html</ref> <small>(''Super Mario 3D Land'' / ''Paper Mario: Sticker Star'')</small><br>''Jùxíng Xūxūguǐ''
|ChiSM=Powerful Boo<br><br>Giant Boo
|ChiT=大害羞幽靈
|ChiTR=Dà Hàixiūyōulíng
|ChiTM=Big Boo
}}

==References==
<references/>

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