Pressing the special move button will cause Samus to start auto-charging energy in her arm cannon, which can be fired by pressing the button again. When the attack has reached maximum strength, Samus will stop charging and resume her neutral standing position, but her arm cannon will start to flash. Pressing the special move button in this state will let her fire the fully charged shot. While charging, the player can press the grab or shield button or the control stick left or right to cancel the charge and/or dodge or roll, and pressing the special move button again will resume her charge. This is called charge-canceling. If Samus is hit while she's charging, she will drop all the stored charge.
When used in the air, Samus will instantly fire, whether the beam was previously charged or not, thus the move cannot be charged in the air. A fully charged shot does 25% damage. The attack inflicts great knockback at higher damage percentages and is a good projectile for edgeguarding. A fully charged shot can also break a Smash Ball in one hit (although the charging time must be taken into account if planning this).
In Super Smash Bros. Melee, Samus's down throw can be used to immobilize an opponent just long enough to allow a quickly-fired Charge Shot to connect with the opponent. This down throw + Charge Shot combo is highly effective against almost every character. Young Link is a notable exception, due to his high rebound height after being thrown down.
In Super Smash Bros. 4, a Miiverse post first claimed it had "drastically improved" speed and power. Indeed, the attack as a whole has been improved considerably, with a slightly faster charging time, quicker startup, and significantly improved knockback that can KO at 115% from the middle of Final Destination. With these buffs, this makes Charge Shot one of Samus's standard finishing options.
Charge Shot has eight different stages of damage and knockback that is determined by the charge of the attack; there are seven stages of charging and the eighth stage is when the Charge Shot is fully charged. Unlike certain other charge attacks such as Giant Punch, the damage and knockback do not decrease when used in the air, and the last stage of charging is strictly weaker than the fully-charged stage, as expected.
In all games so far, Samus is capable of interrupting the charge of the attack by pressing the shield button. Since it is possible to go directly into a jump while shielding, charge canceling can be used to bluff an opponent by allowing them to come close to the player while they're charging, only to find themselves attacked by an aerial. Because the shield button is held down to cancel the shot, many players that are just learning the basics of this technique will perform an aerial Grapple Beam afterwards, since they do not let go of the shield button quickly enough. However, with precise timing, it becomes possible to perform any action that an airborne Samus would normally be able to do.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
If she didn't start out with it, the Charge Beam was one of the first power-ups Samus would get in the Metroid games, starting with Super Metroid. A fully charged Beam's shot would become Samus's only way of damaging certain bosses should she run out of missiles. In Metroid Prime, Charge Beams can be used to clear debris blocking Samus's path or to suck in nearby Energy Balls and Ammo Energy, as well as being the starting point for Charge Combos. In the Metroid series Samus cannot save a charge for later as she can in Smash Bros., though she can continue charging and just hold it for any length of time, as well as begin charging while in motion and in the air. In the Metroid games, the beam also charges noticeably faster.
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