Soccer Ball

A Soccer Ball, also called a Football, is the main focus of the games Super Mario Strikers, Mario Strikers Charged and Mario Strikers: Battle League, and is based off of for  (itself also known as soccer). In these games, players have to gain control of the Soccer Ball and kick it into the goal, something done with either normal kicks, charge shots, Super Strikes (Super Mario Strikers), Mega Strikes and Skillshots (Mario Strikers Charged), or Hyper Strikes (Mario Strikers: Battle League). A normal kick, a charged shot, and a Skillshot result in one point; a Super Strike and a Hyper Strike will score a player two, while a Mega Strike can offer up to six for a team.

In Mario Strikers Charged, the Soccer Ball is made out of metal, which emits a light that indicates the power of the ball. The ball tends to emit a purple light when unused. In this case, shooting the ball is often blocked by the goalie. However, charging the ball by passing or charging the shot, players can turn the light into red, yellow and white, the last indicating the ball is charged enough to make an accurate goal. Apparently, if pressed hard enough, the ball may explode. This is seen in one of Wario's losing cut-scenes, in which he angrily squeezes the ball until it suddenly explodes.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl, the Soccer Ball appears as an item, appearing with its design from Super Mario Strikers. This item cannot be grabbed, however. To use it, it must be attacked, which sends it flying across the stage, catching on fire. The Soccer Ball does not follow an arc when it is attacked. Rather, it shoots in a straight line before suddenly losing all momentum and dropping to the ground, or off the stage. If it hits opponents mid-air, they are flung away. It is also a trophy that can be randomly unlocked.

Super Smash Bros. for Nintendo 3DS / Wii U
In Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, the Soccer Ball returns as an item, functioning the same as in Super Smash Bros. Brawl, except it always returns to the stage after being knocked off of it until it finally disappears. Wii Fit Trainer also uses the Soccer Ball from  in their Header attack and its variations.

Super Smash Bros. Ultimate
Soccer Balls return in Super Smash Bros. Ultimate, behaving exactly the same as they do in Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U.

Super Mario 3D World
While normal Soccer Balls do not appear in Super Mario 3D World, bombs designed after them are introduced.

Mario Kart Tour
In Mario Kart Tour, Soccer Balls appear inside the on the Madrid Drive course and its variants, where they are kicked around by Goombas in shoes. The Goombas always kick Soccer Balls straight ahead of them. After a kick, a Soccer Ball bounces several times, then rolls on the ground slowly; if the ball does not encounter another shoe Goomba a while afterwards, it shrinks down and disappears, respawning above the Goomba that originally kicked it into motion. Drivers can divert Soccer Balls from their usual path by running into them or hitting them with an item, getting bonus points in the process.

Super Smash Bros. for Nintendo 3DS / Super Smash Bros. for Wii U trophy
Blue indicates exclusive to the Wii U version.

Trivia

 * Soccer Balls, although unused in the final product, exist in Super Mario Sunshine within the game's data, with an instance appearing in the test level, which is only accessible through hacking. Behaviorally, they are identical to Durians.
 * A Soccer Ball model exists in Mario Kart 7 data, likely used for testing purposes.