Fireball is Mario's and Luigi's Neutral Special Move in Super Smash Bros. Super Fighting. Mario or Luigi shoots a fireball from his hands. Mario's fireballs are red and bounce along the ground. Luigi's fireballs are green and float in the air, but are faster than before. Both fireballs deal 5% damage to enemies.
The Fire Flower is a classic Mario power-up, originating in the original Super Mario Bros. for the NES. If Mario or Luigi (or other characters such as Toad depending of the game) touch the Fire Flower, they gain the ability to shoot Fireballs, but Luigi never shoots green fireballs, this has been done to diferentiate him from Mario. However, in the Mario Bros. arcade game, there are green fireballs that float as enemies.