Banzai Bills are a larger variety of Bullet Bills that first appeared in Super Mario World. These huge bullets are black-colored and have shark-like smiles. In the game, Banzai Bills are fired from somewhere off-screen and travel slowly towards Mario. Although they seem impossible to defeat, Banzai Bills are not very strong. In fact, they can be destroyed by simply jumping on top of them (just like regular Bullet Bills), although fireballs are ineffective against Banzai Bills.
In other gamesEdit
Super Smash Bros. MeleeEdit
Banzai Bills are a major threat in Super Smash Bros. Melee, where they appeared in the Princess Peach's Castle stage, randomly entering the battle, they would collide into the castle. Once burrowed into the wall, a Banzai Bill will detonate, causing massive damage to anyone caught in its explosion. The explosion will also press any buttons in range, activating platforms and ! Blocks. Also in Super Smash Bros. Melee, a Banzai Bill (as it looks like in Super Mario World) appears in the background of the Yoshi's Island stage.
Mario Strikers Charged FootballEdit
Banzai Bills make a cameo in Mario Strikers Charged Football, in the Sand Tomb field. In this game, they only appear painted in one of the pillars in the background. Here, they are painted the same way they appear in Super Mario World.
New Super Mario Bros.Edit
Banzai Bills reappear in New Super Mario Bros. These Banzai Bills look like their Super Mario World counterparts, except that their coloring has a slight purple hue, and they have red shadows under their eyes to make them look more intimidating. In this game Banzai Bills are fired from huge Banzai Bill Blasters (unlike Super Mario World, where they are fired from an unknown source). Additionally, these Banzai Bills travel very slowly, twirling in the air. Again, a simple jump is enough to defeat these massive enemies.
Super Princess PeachEdit
Banzai Bills reappear in the game Super Princess Peach, which also introduced a red, more dangerous variant of Banzai Bills known as Mad Banzai Bills.
Super Mario GalaxyEdit
In Super Mario Galaxy they appear in the game's last level, Bowser's Galaxy Reactor. They do not home in on Mario's position like Bullet Bills, but are difficult to avoid because of their speed and size.
Mario and Luigi: Bowser's Inside StoryEdit
A Banzai Bill also appears in Mario & Luigi: Bowser's Inside Story. In Dimble Woods, Bowser saw Private Goomp, Corporal Paraplonk and Sergeant Guy carrying a gigantic Bill Blaster where a Banzai Bill could be put in. They explain to Bowser that they are going to fire a Banzai Bill to Bowser's Castle, which was taken over by Fawful, as payback. The three, however, hadn't any Banzai Bill, so Bowser has to search one on his own. It seemed that a Wiggler on a farm had a Banzai Bill after Bowser pulled out his Giga-Carrot, what Bowser had to eat. After the carrot was eaten up, Bowser could choose to save or to get the Banzai Bill right now. If he asks for the Banzai Bill, the Wiggler gets mad because Bowser pulled out the carrot and ate it (which was quite ironic, since Bowser had to eat it for the Wiggler). After Battle, Bowser finally got the Banzai Bill and give it to Private Goomp, Corporal Paraplonk and Sergeant Guy. Then the Banzai Bill has been shotted to Bowser's taken-over Castle. However, Midbus and two other Goombas saw the Banzai Bill, and dodged it via flying.
New Super Mario Bros. WiiEdit
Banzai Bills appear again in the sequel to New Super Mario Bros., New Super Mario Bros. Wii. They are seen on the final castle level of world 7 and are the same as they were in the game's prequel. They are used as an obstacle on the level, where Mario and co. must move up on a platform and Banzai Bills are shot at them. They can be jumped on to reach higher areas, therefore, still being just a bigger version of a Bullet Bill.
Super Mario Galaxy 2Edit
They also appear in a trailer of the upcoming game Super Mario Galaxy 2 and appear to behave exactly as in its prequel.