Editing One-hit KO

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{{incomplete|Needs some more info from Ultimate}}
{{disambig2|attacks with enough knockback to KO in one hit|KOs that occur instantly and bypass all knockback|Instant KO}}
:''For the smasher '''OHKO''', see {{Sm|Okoru}}.''
A '''one-hit KO''', commonly abbreviated as '''OHKO''' (also referred to as an ''Instant KO'' in ''Melee''), is an attack in the ''{{b|Super Smash Bros.|series}}'' games with such high base [[knockback]] that it [[KO]]s an opponent at 0%. Such attacks currently exist in every installment of the series. 

In general, a move is considered a one-hit KO if:

*It is capable of KOing [[Mario]] at 0% ''through sheer knockback alone'' from the middle of the respective game's [[Final Destination]].
*It is not a [[meteor smash]] unless the hitboxes are also capable of OHKOing onstage (meteor smashes like those [[Beast Ganon]] are therefore OHKOs, while [[Luigi]]'s down taunt is not).
*It deals damage and/or does not cause a KO by forcibly re-positioning the opponent (such as [[push]] effects and dragging [[Final Smash]]es. There are some exceptions, such as [[Jigglypuff]]'s [[Puff Up]] in ''[[Brawl]]'' which has both sheer OHKO power and an extreme push effect, and [[Samus]]' [[Zero Laser]] in the same game, which has dragging hits before the final hit).
*It is not extremely situational (such as the first hit of [[Roy]]'s [[Blazer]] against [[Jigglypuff]] in ''Melee'', or Jigglypuff's uncommonly high [[shield jump]]).

Another common standard is to compare the move's knockback to the [[smash attack]] of the [[Home-Run Bat]], one of the few moves intended to be the quintessential OHKO by the developers.

Moves with the potential to OHKO are not necessarily guaranteed to do so, and may fail to OHKO under the following circumstances:
*The opponent [[tech]]s, [[DI]]s, utilizes [[momentum cancel]]ling, and/or [[crouch cancel]]s to reduce the knockback or alter the trajectory of the attack.
*The opponent is flung into a wall, which absorbs enough knockback to prevent the OHKO.
*Knockback may be insufficient to KO at 0% on very large stages (e.g. [[Temple]], [[New Pork City]], and [[75m]]), or from the far edge of a stage.
*Knockback may be insufficient to KO at 0% if the attack had already been landed previously (due to [[stale-move negation]]).
*Knockback may be insufficient to KO [[Weight|heavy]] characters at 0%. 
*Opponents are under an effect that makes them more resilient (such as being [[Super Mushroom|giant]], [[metal]], or in an event that reduces the knockback they sustain), or the player is weakened (such as being [[Poison Mushroom|tiny]] or given a lower [[handicap]]).
*The [[launch rate]] is lower than standard, reducing knockback.

=List of One-Hit KOs=
This page lists the moves that can OHKO within the rules mentioned above. 

Certain moves and situations are '''not''' considered to meet the definition of one-"''hit''" KO's:

*Moves or hazards that inflict no knockback (for example, being flown off the screen by the [[Landmaster]] or eaten by the [[Summit]]'s [[Fish]] or [[Distant Planet]]'s [[Bulborb]]), as they simply move opponents into the blast lines.
*[[Sacrificial KO]]s and [[instant KO]]s (such as [[Bowser]]'s [[Flying Slam]] or [[Hero]]'s [[Whack]]), as they do not deal any conventional knockback. 
*Moves that hit an opponent who is close to a [[blast line]] (such as [[Pikachu]]'s [[Thunder]]), as almost any typical attack ingame will be able to KO opponents at that point.

Some [[stage hazard]]s or [[enemies]] are capable of OHKOing on their respective stages, and will be listed below.

==In ''[[Super Smash Bros.]]''==
Moves that KO'd at 0% were almost nonexistent in the original Smash. In fact, aside from the Home-Run Bat, only one move in the game is able to OHKO, under uncommon conditions:
===Items===
*A [[smash attack]] with the [[Home-Run Bat]].
*If Fox uses [[Reflector (Fox)|Reflector]] on a walking [[Bob-omb]], he (as well as any character caught in the blast radius) will be OHKO'd.
*If 2 Foxes use Reflector on a Green Shell, it will eventually gain OHKO power after 3-4 reflects.

==In ''[[Super Smash Bros. Melee]]''==
Unlike in ''Smash 64'', there are multiple moves that can OHKO in ''Melee''. They still remain rare, however.

===Playable characters' moves===
*{{SSBM|Roy}}'s fully charged [[Flare Blade]] (sweetspot).
*{{SSBM|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after absorbing three strong projectiles (such as three [[PK Flash]]es).
*Roy's [[Counter]] upon countering an extremely powerful attack (sweetspot); a hitbox that deals around 35% damage will result in an OHKO if countered (such as a smash thrown [[Bob-omb]]).

===Items/Enemies===
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]].
*Getting caught in [[Lugia]]'s Aeroblast (if most hits connect). Touching Lugia’s body can also lead to a OHKO if multiple hits chain.
*[[Articuno]]’s Sheer Cold (sweetspot).
*A thrown [[Polar Bear]].

===Stage hazards===
*[[Corneria]]’s laser beams.
*[[Banzai Bill]]'s explosion on [[Princess Peach's Castle]] (if all hits connect).
*On [[Flat Zone]], if a falling tool is launched at enough speed (after either being hit by an extremely powerful attack such as a [[Home-Run Bat]] swing, or being launched after receiving enough damage), it will OHKO anyone it slams into.

===Bosses===
The following will usually cause a OHKO on Very Hard [[difficulty]] only:
*[[Master Hand]]’s Finger Drill (if all hits connect).
*[[Master Hand]]’s Flying Slap.
*[[Crazy Hand]]’s Fake-Out Slap.
*[[Crazy Hand]]’s Power Punch.
*[[Master Hand]] and [[Crazy Hand]]’s Crush (if all hits connect).
*[[Master Hand]]’s and [[Crazy Hand]] Flying Punch (sweetspot).
*[[Master Hand]]’s and [[Crazy Hand]]’s Jestream (sweetspot).
*Combined [[Master Hand]]’s and [[Crazy Hand]]’s Applause (if all hits connect).
*Combined [[Master Hand]]’s and [[Crazy Hand]]’s Sandwich Punch.

===Others===

In [[Cruel mode|Cruel Melee]], several attacks of the [[Fighting Wire Frames]] are powered so much that they can easily OHKO every character. These moves include, for example, [[forward smash]] and [[up smash]], but also punches and kicks. The same strengthening, if not even more, is seen in [[Brawl]].

===Video===
The following video demonstrates nearly all the moves and hazards that KO at 0% in ''Melee'':

{{#widget:YouTube|id=mb5qAONMjLs}}

==In ''[[Super Smash Bros. Brawl]]''==
''Brawl'' continued the trend of adding several OHKOs into the game, resulting in a huge number of them (especially in [[The Subspace Emissary]]). However, the majority are [[Final Smash]]es, [[item]]s, [[stage hazard]]s, [[enemy]] and [[boss]] attacks, with relatively few being standard moves of playable [[character]]s. 
In higher [[Difficulty|difficulties]] of [[The Subspace Emissary]] (often Very Hard or Intense), several [[enemy]] attacks are invariable OHKOs, as well as many [[boss]] attacks. Also, most of [[Tabuu]]'s moves are guaranteed OHKO in every situation, some of them even in the higher [[Difficulty|difficulties]] of [[Boss Battle]] (where the player has only one life).

===Playable characters' standard moves===
*{{SSBB|Ike}}'s stage 8 [[Eruption]]. If Ike gets [[Inhale|inhaled]] by [[Kirby]], the latter's stage 8 Eruption loses its OHKO power (except when reversed or used in midair).
*{{SSBB|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after absorbing three strong projectiles (such as [[PK Flash]]) or a very strong one.
*The following [[counterattack]]s:
**{{SSBB|Ike}}'s Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~40% damage.
**{{SSBB|Marth}}'s Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~45% damage.

Contrary to common belief, Mr. Game & Watch's [[Judge]] #9 is not an OHKO, having very high knockback but not quite enough to qualify under the required conditions.

===Final Smashes===
*{{SSBB|Marth}}'s [[Critical Hit]]. It is also the most powerful player attacks of all ''Smash'' games in term of knockback, without any exterior factors or buffs.
*{{SSBB|Jigglypuff}}'s [[Puff Up]] both by [[push]] and simple contact (the hitbox when Jigglypuff begins deflating has extremely high base knockback in ''[[Brawl]]'').
*{{SSBB|Ganondorf}}'s [[Beast Ganon]] (if most hitboxes land). If a character paralyzed by Beast Ganon is not hit by the charge afterward, they will be inflicted a [[meteor smash]] of OHKO power.
*{{SSBB|Lucario}}'s [[Aura Storm]] at max [[Aura]] if all hits connect.
*{{SSBB|Zelda}}'s [[Light Arrow]] (barely in OHKO threshold, easily [[DI]]ed).
*[[Pokémon Trainer]]'s [[Triple Finish]] (barely in OHKO threshold).
*{{SSBB|Samus}}' [[Zero Laser]] if all hits connect.
*{{SSBB|Olimar}}'s [[End of Day]] if all hits connect (bury, ascent, and explosion). Offstage opponents hit by the rocket's thrusters will also experience an OHKO via [[meteor smash]].
*[[Wario-Man]]'s fully charged [[Wario Waft]].

===Items===
*The [[Dragoon]].
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]].
*[[Lugia]]'s Aeroblast. Touching Lugia’s body can also lead to a OHKO if multiple hits chain.
*[[Articuno]]’s Sheer Cold (sweetspot).
*[[Suicune]]'s Aurora Beam. The beam will not [[freeze]] at 0%, but still deals more than enough knockback to invariably OHKO.
*[[Deoxys]]'s Hyper Beam or touching Deoxys, both the initial hit and the following multi-hitting laser.
*A thrown [[Bonsly]] (sweetspot).
*[[Electrode]]'s Explosion or after being smash thrown.
*[[Wobbuffet]]’s [[Counter]] when countering a OHKO attack or an hitbox that deals at least ~35% damage.
*[[Knuckle Joe]]'s Vulcan Jab to Rising Break attack.
*[[Dr. Wright]]’s highest skyscraper.
*[[Lyn]]’s slash (sweetspot). 
*Five [[Smart Bomb]]s, [[Bob-omb]]s or [[Blast Box]]s exploding at the same time.
*If {{SSBB|Wario}} runs over a buried [[Pitfall]] while riding on his [[Wario Bike]], he will be sent flying at OHKO power.
*If a [[Pitfall]] is thrown on a flying character, he will be [[meteor smash|meteor smashed]] with an OHKO potential if he is midair.
*When an [[Hothead]] reaches its full power for the last seconds (emitting sparks), any contact will be a OHKO. If an uncharged Hothead is hit by a [[flame]]-based hitbox that deals over 30% damage (such as Ike's stage 7-9 Eruption), it will OHKO when smash thrown. Any sparks it gives off while traversing the stage at this strength will also OHKO.
*If a [[Soccer Ball]] is launched at enough speed (after either being hit by an extremely powerful attack such as [[forward smash]], a Home Run bat swing, or being launched after receiving enough damage), it will OHKO anyone it slams into.

===Stage hazards===
*The [[Ultimate Chimera]]'s bite on [[New Pork City]].
*[[Dialga]]'s Roar of Time and Overheat and [[Palkia]]'s Spacial Rend on [[Spear Pillar]].
*The fastest versions of [[Sidestepper]] and [[Shellcreeper]] on [[Mario Bros.]].
*[[Corneria]]'s laser beams.
*Touching the hull of the [[Pirate Ship]].
*The bomb on [[Bridge of Eldin]].
*The first and fourth spikes on [[Rumble Falls]] (can easily be teched).

===The Subspace Army (enemies and clones)===
The following will usually cause a OHKO on Intense [[difficulty]] only:
*[[Big Primid]]'s and other [[Primid|Primids]]' punch.
*The [[forward smash]] of all four [[R.O.B.]]s.
*[[Armight]]'s double blade attack.
*[[Auroros]]'s flying attack.
*[[Big Goomba]]' charge.
*[[Bytan]]'s full power charge (at low health).
*[[Feyesh]]'s sparkling slash.
*[[Gamyga]]'s laser beam (both complete and incomplete form).
*Touching [[Glice]], [[Glire]] and [[Glunder]].
*[[Roturret]]'s projectiles.
*[[Shellpod]]' charge (both armored and non-armor form).
*[[Spaak]]'s thunder.
*[[Towtow]]'s charge.
*The most powerful attacks of [[Shadow Bug|Shadow Clones]], such as [[forward smash]] and [[up smash]].

The following will cause a OHKO on both Very Hard and Intense [[Difficulty|difficulties]]:
*[[Armank]]'s main attack.
*[[Autolance]]'s slash.
*Touching a [[Bombed]].
*[[Floow]]'s mind attack (if most hits connect or at full health).
*[[Bytan|Giant Bytan]]'s full power charge (at low health).
*[[Greap]]'s axe.
*Every [[Nagagog]]'s martial attack (at low health or the last form).
*[[Roader]]'s charge.
*Every [[Shaydas]]' double slash.
*Touching [[Jyk]] (all the three forms).

The following will cause a OHKO on Normal or higher [[Difficulty|difficulties]]:
*Touching the [[Porky Statue]].

The following will cause a OHKO on every [[difficulty]]:
*Multiple [[Floow|Floows]]' combined mind attack (together, if most hits connect or at full health).
*[[Scope Primid]]'s most powerful projectile.

Touching a [[Trowlon]] on every [[difficulty]] is not a OHKO in conventional terms, since it simply carries the player beyond the top blast line, KOing regardless of damage.

Many other enemies and several [[Shadow Bug|Shadow Clones]] are also capable of OHKOs.

===The Subspace Army (bosses)===
The following will usually cause a OHKO on Intense [[difficulty]] only:
*[[Rayquaza]]'s Blast at low health (25%).
*[[Rayquaza]]'s Lightning Strike if most hits connect or at low health (25%).
*[[Porky Minch]]'s Lightning (if most hits connect).
*[[Ridley]]'s Background Ram (sweetspot).
*[[Ridley]]’s Slamming Rush.
*[[Duon]]'s Jump Crash.
*[[Duon]]'s Vacuum Spin (if most hits connect).
*[[Galleom]]'s Shockwave (first hit only).
*[[Galleom]]'s Uppercut.
*[[Tabuu]]'s Explosive Teleport (randomly).
*[[Tabuu]]'s Rapid Chop if most hits connect (final slash only).
*Touching [[Tabuu]] through Electrical Shield.
*[[Tabuu]]'s Shark Blade.

The following will cause a OHKO on both Very Hard and Intense [[Difficulty|difficulties]]:
*[[Porky Minch]]'s Dash.
*Touching the [[Bombed|Porky Bots]] sent out by [[Porky Minch]].
*[[Duon]]'s Sword Blast (the hit itself, not the shockwave).
*[[Meta Ridley]]’s Mega Fire Ball.
*[[Galleom]]'s Tank Rush and Slam (only used by [[Galleom|Tank Galleom]] at very low health).
*[[Galleom]]'s Falling Body Slam.
*[[Galleom]]'s Tornado Spin (if most hits connect).
*[[Tabuu]]'s Pinpoint Explosion.
*[[Tabuu]]'s Bullet Rain (second attack).

The following will cause a OHKO on Hard or higher [[Difficulty|difficulties]]:
*[[Tabuu]]'s Golden Bracket. Due to perfectly horizontal knockback, this attack is a guaranteed OHKO for poor [[recovery]] characters even on Easy [[difficulty]].
*[[Tabuu]]'s Dragon Laser.
*[[Tabuu]]'s Chain of Light. When two [[Player|players]] fight, Tabuu will attempt to smash them together with the Chain, resulting in a potential double OHKO.

The following will cause a OHKO on Normal or higher [[Difficulty|difficulties]]:
*[[Tabuu]]'s [[Off Waves]] or touching [[Winged Tabuu]] (invariable).

The following will cause a OHKO on every [[difficulty]]:
*[[Porky Minch]]'s Energy Laser if most hits connect or Porky has low health (25%).
*[[Meta Ridley]]’s Falcon Flyer Smash.
*[[Meta Ridley]]’s Falcon Flyer Stamp.
*[[Tabuu]]'s [[Off Waves]] or touching [[Winged Tabuu]] (sweetspot).

[[Meta Ridley]]'s Falcon Flyer Pull on every [[difficulty]] is not a OHKO in conventional terms, since it simply pulls the player beyond the bottom blast line, KOing regardless of damage. The only way to survive it is jumping.

Other [[boss|bosses]]' attacks are also capable of OHKOs.

===Classic Mode (bosses)===
The following will usually cause a OHKO on Intense [[difficulty]] only:
*[[Master Hand]]’s Finger Drill (if all hits connect).
*[[Master Hand]]’s Flying Slap.
*[[Crazy Hand]]’s Fake-Out Slap.
*[[Crazy Hand]]’s Power Punch.
*[[Master Hand]] and [[Crazy Hand]]’s Crush (if all hits connect).
*[[Master Hand]]’s and [[Crazy Hand]] Flying Punch (sweetspot).
*[[Master Hand]]’s and [[Crazy Hand]]’s Jestream (sweetspot).
*Combined [[Master Hand]]’s and [[Crazy Hand]]’s Applause (if all hits connect).
*Combined [[Master Hand]]’s and [[Crazy Hand]]’s Sandwich Punch.

===Boss Battle (bosses)===
The following will usually cause a OHKO on Intense [[difficulty]] only:
*[[Duon]]'s Sword Blast (sweetspot; the hit itself, not the shockwave).
*[[Meta Ridley]]’s Mega Fire Ball (sweetspot).
*[[Galleom]]'s Tank Rush and Slam (sweetspot; only used by [[Galleom|Tank Galleom]] at very low health).
*[[Galleom]]'s Falling Body Slam (sweetspot).
*[[Galleom]]'s Tornado Spin (if most hits connect).
*[[Tabuu]]'s Chain of Light. When two [[Player|players]] fight, Tabuu will attempt to smash them together with the Chain, resulting in a potential double OHKO.
*[[Tabuu]]'s Pinpoint Explosion.
*[[Tabuu]]'s Bullet Rain (second attack).
*Touching [[Tabuu]] through Electrical Shield (sweetspot).
*[[Tabuu]]'s Shark Blade (sweetspot).

The following will cause a OHKO on both Very Hard and Intense [[Difficulty|difficulties]]:
*[[Porky Minch]]'s Energy Laser if most hits connect or Porky has low health (25%).
*[[Tabuu]]'s Golden Bracket. Due to perfectly horizontal knockback, this attack is a guaranteed OHKO for poor [[recovery]] characters even on Hard [[difficulty]].
*[[Tabuu]]'s Dragon Laser.
*[[Tabuu]]'s [[Off Waves]] or touching [[Winged Tabuu]] (invariable).

The following will cause a OHKO on Hard or higher [[Difficulty|difficulties]]:
*[[Tabuu]]'s [[Off Waves]] or touching [[Winged Tabuu]] (sweetspot).

The following will cause a OHKO on every [[difficulty]]:
*[[Meta Ridley]]’s Falcon Flyer Smash.
*[[Meta Ridley]]’s Falcon Flyer Stamp.

[[Meta Ridley]]'s Falcon Flyer Pull on every [[difficulty]] is not a OHKO in conventional terms, since it simply pulls the player beyond the bottom blast line, KOing regardless of damage. The only way to survive it is jumping.

Other [[boss|bosses]]' attacks are also capable of OHKOs.

===Others===

In [[Cruel mode|Cruel Brawl]], several attacks of the [[Fighting Alloy Team]] are powered so much that they can easily OHKO every character. These moves include, for example, [[forward smash]] and [[up smash]], but also punches and kicks. Each of the [[Fighting Alloy Team|Alloys]] has specific attacks which are more powerful, such as kicks for the [[Fighting Alloy Team|Blue Alloy]], which is a guaranteed OHKO from the center of the stage even for [[Bowser]]? The same strengthening, or maybe a bit less, is seen in [[Melee]].

===Video===
The following video demonstrates some moves and hazards that KO at 0% in ''Brawl'':

{{#widget:YouTube|id=EpyjRINBJbk}}

This video shows some other OHKOs, including more [[boss]] attacks.

{{#widget:YouTube|id=mU6F6uHrQJs}}

==In ''[[Super Smash Bros. 4]]''==
Like ''Brawl'', ''SSB4'' continues to add OHKOs to the game.

===Playable characters' standard moves===
*{{SSB4|Roy}}'s almost fully charged and fully charged [[Flare Blade]] (sweetspot).
*[[Ike]]’s [[Quick Draw|Unyelding Blade]] (sweetspot).
*{{SSB4|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three medium power projectiles or one very strong one.
*{{SSB4|Villager}}'s [[Pocket]] after it has absorbed a particularly strong projectile, most notably [[Timber]]. Powerful projectiles released by Pocket that can still be reflected will also OHKO, such as {{SSB4|Zelda}}'s fully charged [[Phantom Slash]].
**Many other [[reflector]]s also share this behaviour, especially {{SSB4|Ness}}'s bat.
*The following [[counterattack]]s:
**{{SSB4|Ike}}'s [[Smash Counter]] and {{SSB4|Shulk}}'s [[Power Vision]] custom moves upon countering a hitbox that deals 30% damage or more.
**{{SSB4|Corrin}}'s [[Counter Surge]], Ike and Roy's [[Counter]], and Shulk's [[Vision]] upon countering a hitbox that deals 35% damage or more. These counters technically have varying degrees of knockback, but they nevertheless achieve a KO at 0% without DI.
**{{SSB4|Mii Swordfighter}}'s [[Blade Counter]] upon countering a hitbox that deals 37% damage or more.
**{{SSB4|Lucina}} and {{SSB4|Marth}}'s Counter, {{SSB4|Little Mac}}'s [[Slip Counter]], and {{SSB4|Palutena}}'s {{B|Counter|Palutena}} upon dealing the 50% damage cap with their counters (this requires countering a hitbox that deals at least ~38.5% damage for Little Mac and Palutena, and at least 40% damage with Lucina and Marth).

Contrary to its name and intention, Little Mac's [[KO Uppercut]] does not KO until above about 30% damage. At 0%, it falls short of the necessary amount of knockback, even to a character as light as {{SSB4|Jigglypuff}}, KOing it only at 12%.

===Playable characters' moves (with Rage applied)===
While the following moves do not, under normal circumstances, guarantee an OHKO state, with [[Rage]] they can perform an OHKO:
*{{SSB4|Lucario}}'s forward smash, fully charged. Aura and rage stack.
*{{SSB4|Ganondorf}}'s reversed aerial [[Warlock Punch]].
*{{SSB4|Kirby}}'s [[Giant Hammer]].

===Final Smashes===
*[[Giga Mac]]'s fully charged [[Straight Lunge]] sweetspot, fully charged up smash when sweetspotted, and forward smash when angled up or horizontally.
*{{SSB4|Marth}} and {{SSB4|Lucina}}'s [[Critical Hit]].
*{{SSB4|Shulk}}'s [[Chain Attack]] when boosted with the [[Monado Arts#Customization|Hyper Smash Monado Art]] (Extremely frame-precise, as the final hit must land before the Art expires, as shown in [https://youtu.be/F89Sm_jA38g?t=111 this demonstration video]).
*[[Wario-Man]]'s fully charged [[Wario Waft]].
*{{SSB4|Captain Falcon}}'s [[Blue Falcon]] (barely in OHKO threshold, easily [[DI]]ed by holding towards the stage).

===Items/Enemies===
*The [[Daybreak]] (sweetspot).
*The [[Dragoon]].
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s explosion after being smash thrown.
*If the Hothead is powered up significantly by a [[flame]]-based hitbox (30% total or higher), it will gain OHKO power. Unlike [[Brawl]], Hotheads don't reach full OHKO power automatically for the last seconds. 
*If a [[Soccer Ball]] is launched at enough speed (after either being hit by an extremely powerful attack such as a Home-Run Bat, or being launched after receiving enough damage), it will OHKO anyone it slams into.
*[[Smash attack]]s when boosted by the [[Black Knight]] item from [[Smash Tour]], which occasionally turns smash attacks into OHKOs.

The [[Beetle]] and [[Boss Galaga]] items can carry players past the upper [[blast line]], but as they inflict no knockback they are not considered one-hit KOs. Both can also be easily escaped by button mashing at 0%.

===Stage hazards===
*Touching the hull of the boat on [[Wuhu Island]].
*Touching the hull of the [[Pirate Ship]].

===Other===
While it isn't accessible in regular battles, the [[Target Blast bomb|bomb]] used in the [[Target Blast]] stage apparently has more than enough power to OHKO under normal conditions.

===Bosses===
*[[Master Core]]'s final Waves if the player does not defeat it in time (about 45 seconds).
*[[Master Core]]’s final explosion after unleashing the Waves (sweetspot). However, it can never truly defeat the players as they have already won by the time the hitbox lands.

==In ''[[Super Smash Bros. Ultimate]]''==
Like ''SSB4'', ''Ultimate'' continues to add OHKOs to the game. Several characters also gain the ability to [[instant KO]] through Final Smashes or special moves; these do not count as OHKOs and belong in its respective page.
===Playable characters' moves===
*{{SSBU|Roy}} and {{SSBU|Chrom}}'s fully charged [[Flare Blade]] (sweetspot).
*{{SSBU|Hero}}'s fully charged forward smash if it lands a critical hit.
*The following [[counterattack]]s:
**{{SSBU|Roy}} and {{SSBU|Chrom}}'s [[Counter]], {{SSBU|Joker}}'s [[Rebel's Guard|Tetrakarn]] with [[Arsene]], {{SSBU|Shulk}}'s [[Vision]] with [[Monado Arts|Smash Art]], and {{SSBU|Mii Brawler}}'s [[Counter Throw]] countering a hitbox that deals around 35% damage or more.
**{{SSBU|Corrin}}'s [[Counter Surge]] and {{SSBU|Ike}}'s [[Counter]] countering a hitbox dealing around 40% damage or more.
**{{SSBU|Marth}} and {{SSBU|Lucina}}'s [[Counter]] countering a hitbox dealing around 43% damage or more.
**Any sufficiently strong or repeatedly reflected projectile when reflected.
*{{SSBU|R.O.B.}}'s fully-charged [[Gyro]] will OHKO opponents beyond its maximum speed. However, it requires a much stronger windboxes consecutively at the gyro making it extremely difficult to achieve its power. [https://youtu.be/-vNLNngj4n8]

===Playable characters' moves (with Rage applied)===
*{{SSBU|Hero}}'s [[Command Selection|Hatchet Man]] with [[Command Selection|Psyche Up and Oomph]] active.
*{{SSBU|Mr. Game & Watch}}'s [[Oil Panic]] if absorbed a strong enough projectile like {{SSBU|Hero}}'s [[Frizz|Kafrizz]].
*{{SSBU|Mr. Game & Watch}}'s Judge 9.

Hero's [[Command Selection|Whack]] with [[Command Selection|Thwack]] are actually [[instant KO]]s despite them commonly (and incorrectly) being considered one-hit KOs, as they KO opponents regardless of position. This also applies to any [[Final Smash]] that ends with opponents bursting on the spot in a colorful explosion.

===Final Smashes===
*{{SSBU|Marth}} and {{SSBU|Lucina}}'s [[Critical Hit]].
*{{SSBU|Lucario}}'s [[Aura Storm]] at max aura.
*{{SSBU|Donkey Kong}}'s [[Jungle Rush]] at max rage.
*{{SSBU|Little Mac}}'s [[Giga Mac Rush]] at max rage.
*{{SSBU|Olimar}}'s [[End of Day]] if it hits a fighter that cannot be [[buried]]. End of Day's bury hitbox deals 633.15 units of knockback, more than enough to KO any character on ''Ultimate'''s [[Training (stage)|Training Mode Stage]].
*{{SSBU|Zero Suit Samus}}'s [[Zero Laser]] if all hits connect (barely in OHKO threshold, easily [[DI]]ed by holding towards the stage).

===Items/Enemies===
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s explosion when smash thrown.
*The [[Dragoon]].
*The [[Daybreak]]'s sweet spot.
*If the Hothead is powered up significantly by a [[flame]]-based hitbox (30% total or higher), it will gain OHKO power. Unlike [[Brawl]], Hotheads don't reach full OHKO power automatically for the last seconds. 

===Stage hazards===
*Touching the hull of the [[Pirate Ship]].
*Touching the hull of the boat on [[Wuhu Island]].
*Getting hit by a [[Klaptrap]] on [[Jungle Japes]].

===Bosses===
*[[Galeem]]'s Lens Flare with weaker or no spirits (sweetspot; not guaranteed).
===Other===
While inaccessible in a regular fashion without hacking, the gun found on the [[Stage#In_Ultimate_3|Free the Spirit screen's stage]] is programmed in as its own usable item, inflicting 25% damage with OHKO power. This situation is similar to ''Smash 4''{{'}}s Target Blast bomb.

{{#widget:YouTube|id=W5d-BGAls_s}}

===Video===
The following video demonstrates several of the moves and hazards in ''Ultimate'' that inflict enough knockback to KO at 0%, alongside some powerful moves that don't. However, it also includes a few moves and hazards that do not inflict any knockback:

{{#widget:YouTube|id=Y5IIRDd5ggY}}

==References==
<references />

[[Category:Attacks]]
Several OHKOs from every game:
https://m.youtube.com/watch?v=y6_g2_FvFdA

Some Final Smashes in [[Brawl]]:
https://m.youtube.com/watch?v=M1NebBaQ8ow

Some Poké Balls in [[Melee]]: 
https://m.youtube.com/watch?v=gx_wE6R8L_E

Some Poké Balls in [[Brawl]]: 
https://m.youtube.com/watch?v=pNOnc_7cRqE 

Other Poké Balls in [[Brawl]]:
https://m.youtube.com/watch?v=-2TZyw8-oRE

Some Assist Trophies in [[Brawl]]:
https://m.youtube.com/watch?v=eJBhgB8-_qI
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