Cannon

Cannons are used to fire all kinds of projectiles in the Mario series, including characters. They have a more generic appearance and use than the Bill Blasters which specifically shoot out only Bullet Bills. Cannons are usually part of the environment and cannot be destroyed.

Super Mario Bros. 3
Cannons make their first appearance in Super Mario Bros. 3 in the airship levels. Unlike Bill Blasters, which shoot Bullet Bills straight ahead, fixed cannons shoot their cannon balls diagonally. They are found on floors and ceilings. There are also rotating versions of the cannons, which fire in two directions at a time, then rotate at a 45° angle.

Super Mario 64
Cannons, this time coloured blue, are a vital element in Super Mario 64. Some cannons are under the control of Bob-ombs on the Bob-omb Battlefield, others can be used by Mario himself. In every level that has a cannon, a Bob-omb Buddy can be found somewhere that will open the cannon for Mario. Once in the cannon, Mario can use it to fire himself to higher, previously unreachable areas. For one Power Star in the Whomp Fortress, Mario also has to shoot himself against a wall with the cannon. The wall will break at the force of the impact, releasing the star. Cannons also can help Mario to start flying when he has a Wing Cap (or a Feather in Super Mario 64 DS).

Super Mario Sunshine
In Super Mario Sunshine, there are a few cannons that are operated by Monty Moles. These cannons have three openings from which they shoot Bullet Bills, Missile Bills, and Bombshell Bills. One cannon is near Pinna Park, the other in Noki Bay. Both times, Mario has to defeat the Monty Mole inside the cannon to beat the level. He can destroy the Bullet Bills with FLUDD and if he comes close enough, the Monty Mole will stop shooting and instead throw Bob-ombs. The cannon at Pinna Park leads to a Secret Level, while the one in Noki Bay directly releases a Shine Sprite. Mario also uses a cannon to get to Pinna Park from Delfino Plaza.

New Super Mario Bros.
In New Super Mario Bros. and New Super Mario Bros. Wii, cannons could be unlocked by exiting certain levels or Ghost Houses through a secret exit. These cannons would shoot Mario or Luigi into another world of the game, usually three Worlds away. The exception is New Super Mario Bros. World 1's cannon, which led to World 5.

Super Mario Galaxy
Cannons reappear in Super Mario Galaxy. Now green, these cannons appear to be more advanced than the cannons from Super Mario 64 and they largely fulfill the same role as in the Nintendo 64 game. They also have much more precise aiming, since the player uses the Wii Remote to aim.

Super Mario Galaxy 2
Cannons once again appear in Super Mario Galaxy 2. However, they only appear in Bowser Jr's Boom Bunker, where they are mostly used in place of Launch Stars. In the Throwback Galaxy, the cannon from Whomp's Fortress is replaced by a Sling Star. Cannons in these games are pretty much the same as the original, but there's a target to land on. If the hero manages to hit the center, he gets an extra life.

Donkey Kong series
In Donkey Kong for the Game Boy, cannons appear in a variety of forms. Their appearance changes from level to level. In the Desert, the canons have a dated look taken from the Middle Ages (left image). They fire out bullets that look like Bullet Bills. If Mario gets hit by one, he gets killed. On the Airplane, cannons are made out of steel and look more contemporary, but their basic function is unchanged (top right). In later airship levels, some cannons can change their angle of fire: they will now shoot diagonally and upwards (bottom right).

Cannons later appear in boss fights against Donkey Kong in Mario vs. Donkey Kong 2: March of the Minis.

Super Mario RPG: Legend of the Seven Stars
Although no regular, harmful cannons appear in the game, Pot Cannons make an appearance as the first helpful cannons of the Mario series in Super Mario RPG: Legend of the Seven Stars. They appear in Land's End and help Mario to reach higher places.

Mario & Luigi series
A cannon also appears in Mario & Luigi: Superstar Saga. After the crash of the Koopa Cruiser, Bowser gets stuck in it, and tells Mario and Luigi to get him out. They can not, however. Tolstar then tells them that he will help them getting Bowser out if they collect 100 Beanbean Coins. The Mario Bros. do get the 100 Beanbean Coins, but Tollstar betrays them. Mario and Luigi defeat Tollstar in a battle, but the green Starshade Bro. then comes out and lights the fuse of the cannon, sending Bowser to crash into Hoohoo Mountain. The Cannon then dissapears, allowing Mario and Luigi to pass.

Cannon items appeared in Mario & Luigi: Partners in Time. They were named Cannonballers, and were one of the many Bros. Items in the game.

Paper Mario: The Thousand-Year Door
A giant Cannon appears in Paper Mario: The Thousand-Year Door, in the Fahr Outpost area. This cannon is vital for Mario in the game. He has to use it in order to shoot himself up to the Moon. The cannon itself is big enough that it can fit more than 100 Bob-ombs inside of it. The Bob-ombs are needed to fire the cannon off.

Yoshi's Universal Gravitation
Cannons were used to blast Yoshi to new heights in Yoshi's Universal Gravitation.

Mario Party 7
The Cannon has appeared in Mario Party 7 as an orb in Pagoda Peak and Mario Pinball Land.

Mario Hoops 3-on-3
Smaller Cannons that shot exploding Cannonballs appeared in Mario Hoops 3-on-3 ' Pirate Ship court.

Wario: Master Of Disguise
In Wario: Master of Disguise a golden cannon known as Blamses was a popular attraction. Another cannon in Master of Disguise is the Sphinx Jr., and another cannon known by K9 Cannon.

Super Princess Peach
Cannons (as well as a calm variety) are also enemies in Super Princess Peach. However, in this game, "Cannon" is merely another name for the Super Mario World 2: Yoshi's Island enemy Kaboomba.

Mario & Sonic at the Olympic Winter Games
In Mario & Sonic at the Olympic Winter Games on the Nintendo DS, cannons were used to launch Mario or Sonic to a different island after they have saved the Snow Spirits.

Mario Pinball Land
In Mario Pinball Land Cannons help Mario to reach other areas.

Trivia

 * In the game Mario is Missing!, Luigi had to return the ammunition of a cannon (the Emperor's Cannon) to the Kremlin.