Kannonball

Kannonballs, also formatted Kannon Balls and sometimes known as simply cannonballs, are objects that appear in Donkey Kong Country 2: Diddy's Kong Quest and Donkey Kong Land 2 as means of activating a kannon to blast the Kongs up to a Bonus Area. It also has a side use for defeating enemies, including stronger ones such as Zingers, Krunchas, and Klingers.

Donkey Kong Country 2: Diddy's Kong Quest / Donkey Kong Land 2
The kannonballs have a varying distance from their corresponding kannon, and some appear in a treasure chest. Upon finding a kannonball, the Kongs must pick it up and travel a distance until reaching the kannon itself. To activate the kannon, the Kongs must either throw or carry the kannonball into it. When a kannonball is used to defeat an enemy, the Kongs usually lose grip, and the kannonball falls onto the ground. If a kannonball falls into a pit, the Kongs cannot get it back unless they restart the level.

Kannonballs also act as a stage hazard, because the Kannon enemies fire an indefinite number of them. Unlike barrels, the fired kannonballs cannot be jumped on, as these objects injure the Kongs upon direct contact. Kannonballs, including spiked ones, are also shot out from Kaptain K. Rool's blunderbuss during both fights in K. Rool Duel and Krocodile Kore. As K. Rool is vacuuming them, the Kongs attack him by throwing the kannonball back into his vacuum. By doing so, Kaptain K. Rool's blunderbuss backfires and he blasts out the kannonball.

Donkey Kong 64
In Donkey Kong 64, a single, very large kannonball in Gloomy Galleon near the entrance/exit. The player must have Chunky Kong lift this kannonball and bring it to a nearby kannon; once the kannonball is brought to this kannon, it will activate it. Unlike their previous appearance, kannonballs explode if they hit into something. Using the kannon, the player must use it to shoot several moving targets in the room they are in, with a limited amount of time and kannonballs for ammunition. If player hits all the targets with kannonballs, they will gain a Golden Banana.

Super Smash Bros. Ultimate
Kannonballs, referred to as iron balls, appear as projectiles in Super Smash Bros. Ultimate, where they can be fired by King K. Rool's Blunderbuss move.

Donkey Kong Land 2

 * Virtual Console manual bio: "Stuff a cannonball into a cannon and you may be able to open up a path to a bonus level. You can also throw cannonballs at enemies to defeat them."