Bomb Boo

"When they hit something, they go BOOM!"

- Mailtoad

A Bomb Boo is an explosive, black-colored variety of Boo. They are found in Super Mario Galaxy and its sequel, Super Mario Galaxy 2. Bomb Boos have only appeared in two galaxies: the Ghostly Galaxy; during the missions Beware of Bouldergeist and Bouldergeist's Daredevil Run and in the Boss Blitz Galaxy; during the missions Throwback Throwdown and Throwback Throwdown Speed Run. They are necessary to defeat Bouldergeist. Bomb Boos float lazily back and forth, exploding after some time, but they do move towards Mario or Luigi if they get close to them. If the player Spins near one, Mario or Luigi will grab its tongue, and it will get spun around until it hits something. If Mario or Luigi holds on to the Bomb Boo for too long, they will let go of it.

If the player holds it for too long, it will begin to flash red. If the player does not let go of it then, the Bomb Boo will explode, injuring the player (though by continuing to spin, the Bomb Boo can be swung wider and faster until it flies out of Mario's grip or hits something). Mario or Luigi can hold up to six Bomb Boos at once.

In Super Mario Galaxy 2, Bouldergeist re-appears, along with four other Super Mario Galaxy bosses, in the Boss Blitz Galaxy. Because of Bouldergeist's re-appearance, Bomb Boos make a comeback (so Mario can damage the boss).

Bomb Boos reappear in Mario & Luigi: Superstar Saga + Bowser's Minions as both enemies and controllable units in the new Minion Quest: The Search for Bowser mode. Bomb Boos are flying troopers, and attack by running into enemies. Their special attack, Kaboom Blast, allows them to explode on an enemy. Bomb Boos are strong against Ice Snifits.

Bomb Boos also reappear in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, where they are both enemies and allies in the Bowser Jr.'s Journey mode.