Up smash (abbreviated u-smash) or Up smash attack (上スマッシュ攻撃, Up/upper/above smash attack) is a smash attack performed by any character by tapping the control stick upward and pressing A, or, outside of Melee's single player modes, by pressing up on the C-Stick. The up smash can be charged by holding down the A button for up to one second in conjunction with the C-stick, resulting in higher damage and knockback. If the enemy has heavy damage, it can be easy for the player to Star KO or Screen KO them using these moves.
Up smashes have more flexibility than forward smashes and down smashes in terms of when they can be used. A jump may be cancelled into an up smash, enabling it to be used out of shield immediately and during any part of a character's dash animation, except the skidding animation when they stop running. From Brawl onwards, jump-cancelling to perform a running up smash is unnecessary, and the turn-around animation can be jump-cancelled into a reversed up smash. In Ultimate, jump-cancelling is not required for up smashes out of shield, and can now be done instantly.
List of up smashes in Super Smash Bros.
List of up smashes in Super Smash Bros. Melee
List of up smashes in Super Smash Bros. Brawl
List of up smashes in Super Smash Bros. 4
* This assumes the Mii is default height and weight.
Notable up smashes
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