Missile

Missile (ミサイル, Misairu) is ' side special move in Super Smash Flash 2. Samus releases one of two different types of missiles out of her Arm Cannon. The first is the Homing Missile, which slowly turns towards the closest opponent after it is released. This deals 10% to the opponent. The second type is the Super Missile, which travels straight forwards, but deals 14%, is faster and more powerful, and travels further. To use the Homing Missile, just press the special move button while holding forwards, like doing a side tilt. To use the Super Missile, one must press the special move button and direction simultaneously, like doing a smash attack.

Origin
Missiles have appeared in every game in the Metroid series, starting with the original Metroid. Compared to the standard power beam, missiles are more powerful, capable of unlocking certain doors and defeating more powerful enemies, but with a limited supply that must be replenished from time to time. They are one of the first powerups acquired in each game, usually upon finding a Missile Tank. In the Metroid games, missiles didn't have homing properties until Metroid Prime. However, Samus first had missiles with homing abilities in Super Smash Bros. Melee. Super Missiles first debuted on Super Metroid as more powerful alternatives for common missiles, but with a more limited supply.