Up smash, abbreviated "u-smash," is a smash attack performed by any character by tapping the control stick upward and pressing A, or (in versus mode) by pressing up on the C-stick. The up smash can be charged by holding down the A button for up to two seconds 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.
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Mario - Mario headbutts upward. Moderate Knockback. Can KO most characters around 125%-130%.
Luigi - Luigi headbutts upward. Similar to Mario's but with more Knockback. Kills around 113%-115%.
Wario - Spins in place and headbutts upward, hitting multiple times. Can be used as a sliding DACUS.
Peach - Thrusts her arm up quickly. Very powerful when sweetspotted, but very weak when not sweetspotted. If Peach sweetspotted (Peach's body, as opposed to the arm) an opponent with fully charged Up Smash, it can KO at 50% (When it does 23% damage). Uncharged, kills around 85% when sweetspotted.
Bowser - Hops into the air, hitting with his shell. Very strong knockback with good range.
Dr. Mario - Same as Mario, but with slightly less power, unlike his other moves.
Donkey Kong - Claps overhead. Small hitbox that usually only hits foes directly above him, but great power and fairly fast. Can hit grounded opponents in Brawl.
Diddy Kong - Does a weird cartwheel in place, hitting three times. Not very powerful, but a decent combo move. Can be used as a sliding DACUS. The weakest up smash in Brawl.
Link - Slashes over his head three times. Third hit has most knockback. Mostly used to rack up damage. Can be used as a sliding DACUS.
Zelda - Waves her hand above her head with magical energy. Comes out quickly, pulls opponents in and has a lot of hits, not to mention the great damage and knockback. At low %'s, this can be used multiple times.
Sheik - Pulls with both hands to her sides in a downward way. Does a great deal of damage and knockback when sweetspotted. Not very dificult to sweetspot. Can be used as a sliding DACUS.
Ganondorf - In SSBM, he kicks twice upward powerfully. In Brawl, he kicks once but it hits all the way to the ground. Has a huge amount of IASA Frames in Brawl. High Knockback and kills around 105%.
Toon Link - Slashes above his head once with his sword. More powerful than Link's and could be his best finisher.
Samus - Uses arm cannon and shoots fire above her head, hitting five times. Very weak knockback, perhaps the weakest of all up smashes, but does a lot of damage if all hits connect.
Zero Suit Samus - Twirls her whip above her head. Doesn't have much startup lag and has great vertical range. Great for racking up damage. Only the tip does a lot of knockback.
Yoshi - Headbutts above himself. Moderate knockback and can kill around 130%.
Fox - Does a flipping kick above his head. Very powerful and quick, critical for KOing foes. A great KO move. Best Up Smash of the Star Fox characters. Can kill most characters around 95%. One of the best Up Smashes in the game due to its speed and power.
Falco - Just like Fox's, only weaker (though still pretty strong). Can KO around 125%. Can be used as a sliding DACUS.
Wolf - Does a flipping scissor kick above his head. Kills around 120%. Can be used as a sliding DACUS.
Pikachu - Flips over, hitting with its tail. Similar to Fox's, but with less range and even faster. Good knockback.
Jigglypuff - Headbutts above itself. Can be used as a sliding DACUS. Fairly stong enough to kill around 115%.
Lucario - Punches upwards with blue aura energy. High range.
Charizard - Slashes upward with both wings. Can kill around 115%.
Ivysaur - Powder erupts from his bulb. Arguably the best Up Smash in terms of power, being able to KO at percentages as low as 32%, but suffers from long startup lag.
Squirtle - Slams hands onto the ground, sending twin geysers into the air. Very powerful, enough to kill around 105%.
Pichu - A powerful headbutt that is one of Pichu's best killing moves and combo set ups.
Mewtwo - Holds hand in the air, emitting a spiral of shadowy energy from it. Multiple hits makes it one of his better moves.
Captain Falcon - Kicks upwards twice. Strong knockback. Can kill around 105% in Melee and 115% in Brawl.
Ness - Does an "Around the World" with his yo-yo, arcing it above him. Weaker than most Up Smashes. Yo-yo can also damage while charging up. Interestingly, when it's 'charging' it doesn't increase in damage or knockback.
Lucas - Releases an extremely powerful blast of PSI above him. Second strongest up smash in the game, but very high start-up and ending lag. Can KO as low as 70%.
Peach's Up Smash has the highest KO potential of all of Peach's attacks at 50%, if sweetspotted (Peach's body, as opposed to the arm when it does 23% damage with fully charged and giving powerful vertical knockback) depending on the stage.
Mr. Game & Watch's Up Smash is the third strongest in the game, and can KO rather quickly, depending on the character and stage.
Lucas's Up Smash is the second strongest in the game.
Ivysaur's Up Smash can KO at percentages as low as 32%, and is the strongest Up Smash in the game.
Mewtwo's Up Smash has a multiple hits that makes one of his better moves.
Ness' Up Smash is the only one that does damage while held, and doesn't become more powerful if charged. It also can't be charged over an edge.