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Big Boos, also known as Atomic Boos, are a species of Boo. Usually, they resemble and behave similarly to normal Boos, except that they are larger.
Super Mario series
Super Mario World
The Big Boos (or The Big "Boo") first appear in Super Mario World. In the game, Big Boos inhabit the various Ghost Houses located around Dinosaur Land. They are over three times bigger than a normal Boo, but still have the same mannerisms of their smaller counterparts, meaning that when looked at, they fade and hide behind its arms, occasionally peeking to see if they are still being looked at. However, if Mario or Luigi's back is turned, a Big Boo attacks them from behind.
In the game, Big Boos are much more difficult to pass than their smaller brethren. As such, Mario or Luigi usually have to use a trampoline to jump over these massive ghosts. However, if Mario or Luigi can get a running start, they can usually Spin Jump over a Big Boo. Additionally, if there is room, the brothers can use a cape to fly over a Big Boo or perform a sliding Cape Attack during descent to actually destroy the Big Boo. Additionally, a translucent white one also called "The Big Boo" is a hidden boss of the Secret Donut Plains Ghost House. He can be defeated by throwing Grab Blocks at his face. Two normal Boos accompany him in battle.
Super Mario 64 / Super Mario 64 DS
Big Boos return in the game Super Mario 64. Again, a Big Boo disappears when looked at, and become visible again when Mario turns away. They have a high pitch laugh like a normal Boo, but make the same low pitch grunt as a Thwomp does (changed to the sound made when a platform drops in the DS remake) when hit. If these Boos attack Mario, he loses three bars of health.
Big Boos can only be attacked when visible, so Mario has to attack these massive ghosts by either Ground Pounding them from above or punching them from the side. There is one Big Boo in the courtyard. This one is larger than the others. If Mario kills this one, it drops a cage, leading to Big Boo's Haunt. In this course, Mario can fight three Big Boos. These Big Boos take three hits to defeat, becoming smaller after each hit. However, if the player leaves the area before completely defeating a Big Boo, the Big Boo's health resets. After destroying a Big Boo, Mario receives a Power Star.
In the Japanese version, the giant Boos are known as "Boss Boo" rather than their usual Japanese name "Atomic Boo". The giant Boo that appears when all the ghost house Boos are defeated is also known as "Master Boo".
In the DS remake, Big Boos play the same role as in the original. King Boo makes an appearance, however, while King Boo retains his trademark crown from later appearances and characteristic cackle, he is erroneously referred to as "Big Boo" in English versions.
New Super Mario Bros. Wii
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 Houses, and are usually seen with many smaller Boos. 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.
Super Mario Galaxy 2
The model for a Big Boo (as "TeresaChief" in Boo in a Box) exists in Super Mario Galaxy, but is not shown in full size in the final game. Big Boos make their proper appearance in the sequel, using the same model (renamed "TeresaAtomic"). They go under the name Mega Boo or "King Boo".
They follow Mario through a thin hall, not stopping unless they are looked at or the player reaches a Power Star or Launch Star. Big Boos are only found in groups of five, with the Big Boo in the middle being larger than the ones surrounding it. Big Boos are only seen in Sneaking Down the Creepy Corridor in Haunty Halls Galaxy.
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 houses. 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
Big Boos reappear in the Ghost Houses of New Super Mario Bros. 2. They can be turned into Gold Big Boos by hitting them with a gold fireball or by passing through a Gold Ring. While in their golden form, they cover their faces and leave a trail of coins 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.
New Super Mario Bros. U
Big Boos reappear on the Nintendo Wii U title New Super Mario Bros. U, once again only appearing in Ghost Houses. Nothing has changed in their behavior, but now if Mario is watching, Big Boos began to sweat.
Super Mario 3D World
Big Boos also appear in Super Mario 3D World with the same behavior of Super Mario 3D Land. Some can be seen outside the windows in Ghost Houses watching the player, but these Big Boos do not do anything special. Big Boos can now be defeated by Light Boxes, leaving coins.
Super Mario World television series
Big Boos appeared in two episodes of the Super Mario World animated series. In the episode "Ghosts 'R' Us", Yoshi, while exploring Wizardheimer's 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 Wizardheimer's 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 Wizardheimer's Haunted House.
In Super Mario World's final episode, "Mama Luigi", a Big Boo is seen acting as a guard to Neon Castle. Mario, Luigi and Yoshi easily sneak past this Big Boo guard by using a nearby Warp Tube, which led to the basement of Neon Castle.
Super Mario Adventures
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 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 Toadstool.
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 Circling Boo Buddies. Mario must shoot the one with his tongue out to win.
Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
In Super Mario World 2: Yoshi's Island, they appear in many Towers and Castles. However, in this game, they are only about three times bigger than a normal Boo, unlike 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 Stars when defeated. Additionally, one of the bosses, Bigger Boo, starts as a normal Big Boo before being transformed by Kamek's magic.
Yoshi's Island DS
In Hotel Mario, Big Boos, first appearing in Ludwig's Thump Castle Hotel, are powerful enemies, being about one-sixth the size of a hotel floor; Big Boos in this game attacked in a manner similar to the ones of Super Mario World, slowly floating towards Mario or Luigi when they look away, turning transparent when directly looked at.
Super Mario RPG: Legend of the Seven Stars
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. While there is an enemy called "The Big Boo", it is in fact a misnamed regular Boo.
Mario Party series
A Big Boo appears in Pedal Power, and the player must pedal a bike to start up a light bulb before the Big Boo catches them.
Mario Party 2
In Mario Party 2 a Big Boo appears in the Horror Land stage. As a typical Boo, it is able to steal objects from player's rivals, being coins or stars. However, Big Boo deals for stealing the coins or the stars from all the opponents, while paying to him three times the amount of coins than a normal Boo would do. Characters can ask for him only in night time; in daytime, Big Boo appears as a giant Boo statue. Since Big Boo can only be visited at night after taking a path that requires the Skeleton Key, meeting him proves to be a difficult and rare opportunity for players, especially during "Lite Play" mode.
Mario Party 4
In Mario Party 4, Big Boo reappears in the board Boo's Haunted Bash, having the same role as in Mario Party 2. In the game, it appears in an odd blue color. It appears when the two Happening Spaces at the top right of the board are activated three times.
Game & Watch Gallery series
Big Boo is an opponent in the Boxing game for Game & Watch Gallery 4. He is Luigi's second opponent. However, instead of boxing gloves, Big Boo uses smaller Boos to pummel his opponent.
Paper Mario series
Paper Mario: The Thousand-Year Door
Big Boos, known here as Atomic Boos, make their Paper Mario series debut in Paper Mario: The Thousand-Year Door, with a single one appearing as an optional mini-boss. 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 Shroom). Even though Mario agreed to be nice to the Boos, they swarm him as soon as they are free. If Mario knocks the Boos away twice with the Super Hammer by using the Spin Attack, the Boos combine together to make 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. Once Atomic Boo is defeated, he relinquishes his Lucky Start badge to Mario and the Boos stop their swarming and appear as normal enemies.
A glitch can occur involving this Boo; it is possible for it to drop the reward for defeating it, the Lucky Start badge, down the hole revealed by pushing the star statue. This renders the badge unobtainable unless the player restarts from a previous save.
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.
Paper Mario: Sticker Star
In Paper Mario: Sticker Star, the enemy was 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. 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 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.
Luigi's Mansion series
Although Big Boos do not appear in the final version of Luigi's Mansion, an early model for King Boo in the game's files resemble a Big Boo. There is also a boss in the game named Boolossus, an enormous Boo made of 15 other Boos.
Luigi's Mansion: Dark Moon
In Luigi's Mansion: Dark Moon, Big Boo is one of the three bosses fought in Treacherous Mansion, the final mansion in the game. Luigi and E. Gadd were tricked by King Boo to come into the miniature train station inside the Train Exhibit, because E. Gadd thought that King Boo was there along with Mario's painting. Ten Boos are inside a mini train display in which they come together to form into Big Boo. The 10 Boos that assemble together are the only ghosts in the game who are not sucked into the Poltergust 5000, as they are trapped in the trains' cages and later placed in the Boo Canister by E. Gadd.
In battle, the Big Boo has three attacks. Its first attack involves it trying to crush Luigi from above. It attempts to crush Luigi three times in a row. If it misses all three times, it is momentarily dazed. Its other attack involves hiding halfway in the ground and attempting to charge into Luigi from there. If it misses Luigi and hits the moving train, it is stunned. However, if it misses Luigi and the train, it just floats back into the arena. When separated into individual Boos, they can ram into Luigi. The third attack happens only if Luigi pulls back on Big Boo's tongue for too long, in which the boss will recover and ram into Luigi. This attack is also used by the Boos.
To defeat Big Boo, Luigi has two different methods of attacking it. The first one involves avoiding Big Boo while it slams into the ground three times before becoming stunned. Luigi has to pull Big Boo's tongue and launch it into the drill of the moving toy train. The other way is to make Big Boo dash slightly in front of the train. When the Big Boo hits the drill on the train, he splits into ten Boos. Luigi must pull their tongues and send them flying towards the carriages of the train. When one of them hits a carriage, that Boo gets imprisoned inside the carriage and is unable to escape. Once all of Boos have been imprisoned in the carriages, the mission is complete and the Pixelator takes Luigi out of the train display and back to the Bunker. Afterwards, E. Gadd Pixelates the Boos into the Boo Canister.
Mario Pinball Land
In Mario Pinball Land, Big Boo is one of the four bosses. He appears in the haunted house at the Fun Fair. He has the last Star Key. To defeat him, Mario has to attack him from behind. He has no direct attacks, but instead approaches Mario continuously. If Mario comes into contact with Big Boo from the front, he temporarily spins out of control as if in a daze.
Super Princess Peach
Big Boos also appear in Super Princess Peach. Unlike normal Boos, they are invincible. However, they can be stunned permanently by leading one to a ray of light, which only appears in World 3-2. When they are stunned, they are harmless and can be used as platforms. This game also introduces a new Big Boo species, the Mad Big Boo. Like normal Mad Boos, they stay still when Peach turns away from one, and chases after her when she looks at it.
Mario Golf: World Tour / Mario Sports Superstars
In Mario Golf: World Tour, whenever Boo gets an Eagle, Albatross, or Hole-in-One, the animation shows multiple Boos who mix it in to form a Big Boo. The same animation is reused in Mario Sports Superstars.
Captain Toad: Treasure Tracker
Big Boos reappear in Captain Toad: Treasure Tracker with only a few tweaks from Super Mario 3D World. While they act the same by following a Toad when they aren't being watched, they are far less a threat due to Captain Toad and Toadette headlamp, which can destroy them. To compensate for this, Big Boos generally appear in groups of two or more.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Big Boos reappear in Super Mario Maker and Super Mario Maker for Nintendo 3DS. 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. 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.
Mario & Luigi: Superstar Saga + Bowser's Minions
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 attack, Piercing Projectile, allows them to spit a blue beam at an enemy. Big Boos are slow, but have high HP and power.
Notable Big Boos
Names in other languages