Editing One-hit KO

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{{disambig2|attacks with enough knockback to KO in one hit|KOs that occur instantly and bypass all knockback|Instant KO}}
:''For the smasher sometimes known as "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 will [[KO]] an opponent at 0%. Such attacks currently exist in every installment of the series.

==Definition==
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]] ({{SSB|Dream Land}} in ''[[SSB]]'').
*It is not a [[meteor smash]] unless the hitboxes are also capable of OHKOing onstage (meteor smashes like [[Beast Ganon]]'s are therefore OHKOs in ''[[Brawl]]'', 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 {{SSBB|Samus}}' [[Zero Laser]] in ''Brawl'', which has dragging hits before the final hit.
*It is not extremely situational (such as the first hit of {{SSBM|Roy}}'s [[Blazer]] against {{SSBM|Jigglypuff}} on specific [[stage]]s 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, or successfully executes a wall tech.
*The move's [[sweetspot]] (if any) does not land (such as [[Roy]]'s [[Flare Blade]] in every game featuring him).
*The move requires more hitboxes to land but some of them fail (for example, [[Lugia]]'s Aeroblast in ''Melee'', which can whiff if the character is hit on the edge and escapes; in ''Brawl'', it deals a single, immensely powerful hit which always OHKOs, but suffers from a smaller hitbox).
*The stage is extremely large (e.g. [[Temple]], [[New Pork City]], and [[75m]]), or the opponent is at the far edge of a stage.
*The move was weakened previously due to [[stale-move negation]].
*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.
*The opponent's [[gravity]] is affected via [[equipment]].
*The player is under the effect of a [[sticker]] or a [[spirit]] that increases resistance to [[flinch]]. It is only possible in [[Adventure Mode]]s.

A [[Final Smash]] executed using [[Final Smash Meter]] always loses its OHKO potential, unless specific spirits prevent this.

==List of One-Hit KOs==
{{cleanup|A large number of entries were added by a single user (through sockpuppets) with sources that didn't meet standard criteria, didn't show what was claimed, or were the wiki itself. SSB64, Melee (except for bosses), and Ultimate have been verified and cleaned.}}
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 drag opponents into the [[blast line]]s.
*[[Sacrificial KO]]s, [[self-destruct]]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 very powerful [[Thunder]] in ''[[Brawl]]'' or [[Ike]]'s [[Great Aether]] on specific [[stage]]s in the same game), 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 at 0% are 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 {{SSB|Fox}} uses {{b|Reflector|Fox}} on a walking [[Bob-omb]], he (as well as any character caught in the blast radius) will be OHKO'd.
*If two Foxes use Reflector on a [[Green Shell]], it will eventually gain OHKO power after 3-4 reflects.

====Video====
The following video demonstrates the main moves that KO at 0% in ''Smash Bros.'' for the Nintendo 64:

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

===In ''[[Super Smash Bros. Melee]]''===
Unlike in ''Smash 64'', there are multiple moves that can OHKO in ''Melee'', including [[Character|playable character]]s' attacks and [[stage hazard]]s. They still remain relatively rare, however.

====Playable characters' moves====
*{{SSBM|Roy}}'s (almost) fully charged [[Flare Blade]] (sweetspot).
*Roy's [[Counter]] (sword hitbox) upon countering a hitbox that deals at least ~35% damage (sweetspot).
*{{SSBM|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three strong projectiles (such as three [[PK Flash]]es).

Contrary to common belief, Roy's [[Blazer]] is not an OHKO, having very high [[fixed knockback]] but not quite enough to qualify under the required conditions. However, in particular situations, it could potentially KO very light characters at 0% in small [[stage]]s if only the first hit connects, specifically characters not heavier than {{SSBM|Jigglypuff}}.

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.

====Items/Enemies====
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]].
*[[Articuno]]'s Icy Wind.
*Getting caught in [[Lugia]]'s Aeroblast (if most hits connect). Touching Lugia's body can also lead to an OHKO if multiple hits chain (while a single hit KOs {{SSBM|Mario}} as low as 35%).
*A thrown [[Polar Bear]] (smash throw).
*A [[Green Shell]] gains OHKO power when reflected 3 or 4 times by two {{SSBM|Fox}}es using [[Reflector]].

[[Marill]]'s Tackle can push players past the side [[blast line]], but as it inflicts no conventional knockback, it is not considered a one-hit KO.

====Stage hazards====
*Rapid laser shots from the Great Fox on [[Corneria]], as well as the turrets while the Great Fox is charging.
*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.
*[[Banzai Bill]]'s explosion on [[Princess Peach's Castle]] (if all hits connect).

While touching a blue [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====Bosses====
The following will usually cause an OHKO on Very Hard [[difficulty]] only:
*{{SSBM|Master Hand}}'s Finger Drill (if the hits fail to lead into each other), Tri-Poke (if all hits land).
*{{SSBM|Crazy Hand}}'s Fake-Out Slap and Flying Slap.
*Master Hand and Crazy Hand's Crush (if all hitboxes land), Power Punch, Flying Punch (sweetspot), and Jetstream (sweetspot).
*Combined Master Hand's and Crazy Hand's Applause (if all hits connect) and Sandwich Punch.

====Others====
In [[Cruel Melee]], almost all the 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, kicks, and other moves.

====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 [[boss]] attacks, with relatively few being standard moves of playable [[character]]s. On the higher [[Difficulty|difficulties]] of The Subspace Emissary, several boss attacks become invariable OHKOs.

Some notes:
*In The Subspace Emissary, the player's [[gravity]] and [[falling speed]] are automatically increased up to 19% from normal Brawls, making KOs less likely.
**It is also possible to use very strong [[flinch]] or [[launch]] resistance [[sticker]]s to severely reduce knockback, although they are unlikely to protect from very powerful moves of OHKO power. This becomes more evident on the higher difficulties.
*In Boss Battles, boss attacks are normally weaker, having slightly more than one half of their original speed and power (with some notable exceptions). This is done to partially compensate the fact that the player has only one [[stock]] and no continues, items or stickers. As such, almost none of the boss attacks which OHKO in Emissary will do so in Boss Battles, except for Tabuu' Off-Waves on intense.

====Playable characters' standard moves====
*{{SSBB|Ike}}'s stage 8 [[Eruption]]. The sword's tip can also inflict a [[meteor smash]] of OHKO power, regardless of the stage.
*{{SSBB|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three medium power [[projectile]]s (such as three [[PK Flash]]es) or a very strong one.
*The following [[counterattack]]s:
**Ike's Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~45% damage.
**{{SSBB|Marth}}'s Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~50% damage.
*Any sufficiently strong or repeatedly [[Reflector|reflected]] projectile when reflected or countered, such as {{SSBB|Zelda}}'s [[Din's Fire]], or a [[Green Shell]].

====Final Smashes====
*Marth's [[Critical Hit]].
*{{SSBB|Lucario}}'s [[Aura Storm]] at high [[Aura]] if most hits connect.
**If the initial take off lands, the attack OHKOs {{SSBB|Mario}} when Lucario has only taken 95% damage (roughly a 55% Aura). Considering only the beam's power, it is an OHKO starting from 125% damage for Lucario (roughly a 73% Aura).
*{{SSBB|Pokémon Trainer}}'s [[Triple Finish]] if most hits connect (always needs the last hit to land for a KO).
*{{SSBB|Ganondorf}}'s [[Beast Ganon]] if most hitboxes land (at least one stomp and charge). If a character paralyzed by Beast Ganon is not hit by the charge afterward, they will be inflicted a [[meteor smash]] of OHKO power.
*Zelda's [[Light Arrow]] (first opponent only).
*{{SSBB|Samus}}' [[Zero Laser]] if all hits connect.
*{{SSBB|Olimar}}'s [[End of Day]] if all hitboxes land (bury, ascent, and explosion). Offstage opponents hit by the rocket's thrusters will also experience an OHKO via meteor smash.
*{{SSBB|Captain Falcon}}'s [[Blue Falcon]].
*[[Wario-Man]]'s [[Wario Waft]] fully charged.

{{SSBB|Luigi}}'s [[Super Jump Punch]] during [[Negative Zone]] can KO almost all characters at 0% in several situations, but it is not considered a true one-hit KO under the general definition. In fact, while Negative Zone is active, characters' [[weight]] could be severely reduced, making KOs much more likely. This Final Smash will also inflict damage to the characters: it implies that, when Luigi's Super Jump Punch lands, characters have already taken more than 0% damage.

====Items====
*The [[Dragoon]].
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]]'s wings.
*[[Suicune]]'s Aurora Beam.
*[[Deoxys]]'s Hyper Beam (or touching its body), both the initial hit and the following multi-hitting laser.
*[[Electrode]]'s Explosion when smash thrown. If an Electrode fails to burst, it can still be picked up and smash thrown with guaranteed OHKO power.
*If {{SSBB|Wario}} runs over a buried [[Pitfall]] while riding on his [[Wario Bike]], he will be sent flying at OHKO power. A thrown Pitfall can also meteor smash midair opponents with OHKO power.
*When a [[Hothead]] reaches its full power for the last seconds before fading, or after taking enough [[damage]], any contact will be an OHKO (touching the sparks is even more powerful).
**If an uncharged Hothead is hit by an [[electric]] or [[flame]]-based hitbox that deals at least 30% damage (such as {{SSBB|Ike}}'s stage 6-9 [[Eruption]]), it will OHKO when smash thrown or launched. Any contact while traversing the stage at this strength (or with the sparks it emits) 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]] or a Home Run bat swing, or simply being launched after receiving enough damage), it will OHKO anyone it slams into.

====Stage hazards====
*The [[Ultimate Chimera]]'s bite on [[New Pork City]].
**If the the bite lands on the mouth's edge, it deals the same immense knockback of Marth's Critical Hit. If the bite traps the character inside the mouth (or the Ultimate Chimera turns around to inflict a reverse bite), both knockback and damage are even higher, rivalling [[Tabuu]]'s Off Waves on the higher difficulties.
*[[Corneria]]'s laser beams.
*Touching the hull of the [[Pirate Ship]].
*The first and fourth spikes on [[Rumble Falls]] (can easily be teched).

While touching a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====The [[Subspace Army]] bosses====
The following will usually cause an OHKO on Intense [[difficulty]] only:
*Several of [[Rayquaza]]'s moves at low health (25% or less):
**Sweetspotted Dig, Ground Burst, Dash, and Air Dash.
*Several of Rayquaza's moves at very low health (5% or less):
**Iron Tail boosted by Roar (sweetspot; Roar is sometimes used to push the player away and slightly increase the knockback of certain moves).
**Horizontal Electric Ball and Diagonal Electric Ball.
*Several of [[Porky Minch]]'s moves:
**Jump (sweetspot).
***Lightning. On Intense difficulty a single hitbox deals more than enough knockback to OHKO, regardless of Porky's health.
*[[Ridley]]'s Flying Stomp (sweetspot), Loop-de-Loop (if most hits connect), Tail Swoop (if most hits connect at very low health; always needs the last hit to land for a KO) and Slamming Rush.
*Several of [[Duon]]'s moves:
**Triple Slash (if most hits connect; always needs the last hit to land for a KO) and Blue Bolts or Vertical Pink Shots (contact with the bright blue / pearl sphere only, not the beams - which KO at 30%).
**Homing Missiles if all the four chasing [[projectile]]s explode at the same time.
*[[Galleom]]'s Side Crush (sweetspot) and Uppercut (sweetspot).
*[[Meta Ridley]]'s Tail Swoop (if most hits connect; always needs the last hit to land for a KO) and Swoop.
*[[Tabuu]]'s Diving Slash (sweetspot) and Ghost Projection (surrounding burst, clones and Tabuu's body hitbox).

The following will cause an OHKO on both Very Hard and Intense difficulties:
*Rayquaza's Lightning Strike (only used at low health; it deals massive [[fixed knockback]] that increases with difficulty) and Blast.
*Several of Porky Minch's moves:
**Touching the Porky Bots sent out by Porky Minch.
**Stabbing Flurry if most hits connect (always needs the last hit to land for a KO).
**Energy Laser (both variants).
***The airborne version deals a single hit of OHKO power.
***The ground version circles multiple times (up to three on Intense difficulty), and two hitboxes landing deal more than enough knockback to invariably OHKO.
*Ridley's Background Ram.
*Duon's Vacuum Spin (if most hits connect or via meteor smash) and Charge.
*Galleom's Shockwave (first punch only), Tank Rush (only used by Tank Galleom at medium to high health) and Jump.
*Tabuu's Explosive Teleport and Shuriken Boomerang (second swing).

The following will cause an OHKO on Hard or higher difficulties:
*Porky Minch's Dash.
*Duon's Sword Blast (the slash itself, not the shockwave - which KOs below 20% on Intense), Head Sword Chop and Jump Crash.
*Meta Ridley's Mega Fire Ball (flames and head hitboxes).
*Galleom's Tank Rush & Slam (both hitboxes; the falling attack is quite stronger and only used by Tank Galleom at low health), Tornado Spin (if most hits connect) and Falling Body Slam.
*Several of Tabuu's moves: 
**Shuriken Boomerang (first swing), Shark Blade (blade and Tabuu's body hitbox) and Chain of Light (on a single target).
**Bullet Rain (second hitbox: the huge energy sphere). Both hitboxes landing will always OHKO on every difficulty.
**Pinpoint Explosion. Due to perfectly horizontal knockback, this attack will always cause a guaranteed KO for poor [[recovery]] characters even on lower difficulties.

The following will cause an OHKO on Normal or higher difficulties:
*Several of Tabuu's moves:
**Dragon Laser.
**Chain of Light on two targets. Tabuu will attempt to smash the players together with the Chain, nearly always resulting in a double OHKO.
**Golden Bracket (on a single target). Due to perfectly horizontal knockback, this attack will always cause a guaranteed KO for poor recovery characters even on Easy difficulty.
**Electrical Shield (sparkles and Tabuu's body hitbox). Due to perfectly horizontal or [[spike]]d knockback, this attack will always cause a guaranteed KO for poor recovery characters even on Easy difficulty.
***On Easy difficulty only (Normal or below in Boss Battles), when the players touch the spark rings (far enough from Tabuu's body) they will simply flinch, but they can be sucked in repeatedly by a very powerful [[vacuum]] until they are KOed.
***If the player is on the attack's endpoint, there is a small possibility that they will suffer multiple hits by the sparks before being sucked in, resulting in a guaranteed KO regardless of difficulty. However, this is quite unlikely, as they usually sustain a single hit.

The following will cause an OHKO on every difficulty:
*Porky Minch's Lightning if most hitboxes land (at least two huge discharges). This variant of the attack is only used when Porky has low health (25% or less).
*Meta Ridley's Falcon Flyer Smash and Falcon Flyer Stamp. These attacks will also drag the player past the bottom [[blast line]] for a guaranteed KO. In any case, the only way to survive is by jumping.
**However, contact with Meta Ridley while it's rising after Falcon Flyer Smash will send the player past the blast line for a guaranteed KO, forcing the player to pay attention before landing.
*Several of Tabuu's moves:
**Rapid Chop if most hits connect (always needs the last slash to land for a KO).
**Golden Bracket on two targets. Tabuu will attempt to smash the players together, always resulting in a double OHKO. The same happens if both players are trapped in the cage.
**Bullet Rain if both hitboxes land (highly damaging bullets and the huge energy sphere).
**Off Waves (waves and Winged Tabuu's body hitbox).
*These small hitboxes always deal a guaranteed KO:
**Touching the sparkling spheres of Porky Minch's Lightning and Energy Beam, or jumping on Porky during these moves.
**Standing on Duon while Jump Crash is performed.
**Touching Tabuu's hand when he shoots the huge energy sphere during Bullet Rain attack (always noticed due to the red flash).

Meta Ridley's Falcon Flyer Pull on every difficulty is not an OHKO in conventional terms, since it simply drags the player past the bottom blast line for a guaranteed KO. The only way to survive is by jumping. Ridley's Blasting Roar, Porky Minch's Dash and Galleom's Shockwave can also carry the player past the side blast lines, but only under certain conditions and can be easily avoided.

Other boss attacks are also capable of OHKOs.

====Classic Mode (bosses)====
The following will usually cause an OHKO on Intense [[difficulty]] only:
*{{SSBB|Master Hand}}'s Tri-Poke (if all hits connect), Crush (if most hitboxes land) and Vertical Throw.
*{{SSBB|Crazy Hand}}'s Squeeze (if most hitboxes land), Flying Slap and Fake-Out Slap.
*Master Hand's and Crazy Hand's Power Punch, Flying Punch and Jetstream.
*Combined Master Hand and Crazy Hand's Sandwich Punch (guaranteed).

The following will cause an OHKO on both Very Hard and Intense difficulties:
*Master Hand's and Crazy Hand's Finger Drill if most hits connect.
*Combined Master Hand's and Crazy Hand's Applause (if most hits connect), Sandwich Punch (sweetspot) and Crush Punch.

====[[Boss Battles]] (bosses)====
The following will usually cause an OHKO on Intense [[difficulty]] only:
*[[Rayquaza]]'s Lightning Strike (only used at low health; it deals massive [[fixed knockback]] that increases with difficulty) and Blast.
*Several of [[Porky Minch]]'s moves:
**Stabbing Flurry if most hits connect (always needs the last hit to land for a KO).
**Energy Laser (both variants).
***The airborne version deals a single hit of OHKO power.
***The ground version circles up to two times, and both hitboxes landing deal more than enough knockback to invariably OHKO.
*[[Ridley]]'s Background Ram.
*[[Duon]]'s Vacuum Spin (if most hits connect or via [[meteor smash]]) and Charge.
*[[Galleom]]'s Shockwave (first punch only), Tank Rush (only used by Tank Galleom at medium to high health) and Jump.
*[[Tabuu]]'s Explosive Teleport and Shuriken Boomerang (second swing).

The following will cause an OHKO on Very Hard or higher difficulties:
*Porky Minch's Dash.
*Duon's Sword Blast (the slash itself, not the shockwave - which KOs below 40% on Intense), Head Sword Chop and Jump Crash.
*[[Meta Ridley]]'s Mega Fire Ball (flames and head hitboxes).
*[[Galleom]]'s Tank Rush & Slam (both hitboxes; the falling attack is quite stronger and only used by Tank Galleom at low health), Tornado Spin (if most hits connect) and Falling Body Slam.
*Several of [[Tabuu]]'s moves: 
**Shuriken Boomerang (first swing), Shark Blade (blade and Tabuu's body hitbox) and Chain of Light (on a single target).
**Bullet Rain (second hitbox: the huge energy sphere). Both hitboxes landing will always OHKO on every difficulty.
**Pinpoint Explosion. Due to perfectly horizontal knockback, this attack will always cause a guaranteed KO for poor [[recovery]] characters even on lower difficulties.

The following will cause an OHKO on Hard or higher difficulties:
*Several of Tabuu's moves:
**Dragon Laser.
**Chain of Light on two targets. Tabuu will attempt to smash the players together with the Chain, nearly always resulting in a double OHKO.
**Golden Bracket (on a single target). Due to perfectly horizontal knockback, this attack will always cause a guaranteed KO for poor recovery characters even on Easy difficulty.
**Electrical Shield (sparkles and Tabuu's body hitbox). Due to perfectly horizontal or [[spike]]d knockback, this attack will always cause a guaranteed KO for poor recovery characters even on Easy difficulty.
***On Easy difficulty only (Normal or below in Boss Battles), when the players touch the spark rings (far enough from Tabuu's body) they will simply [[flinch]], but they can be sucked in repeatedly by a very powerful [[vacuum]] until they are KOed.
***If the player is on the attack's endpoint, there is a small possibility that they will suffer multiple hits by the sparks before being sucked in, resulting in a guaranteed KO regardless of difficulty. However, this is quite unlikely, as they usually sustain a single hit.

The following will cause an OHKO on Normal or higher difficulties:
*Porky Minch's Lightning if most hitboxes land (at least two huge discharges). This variant of the attack is only used when Porky has low health (25% or less).
*Several of Tabuu's moves:
**Golden Bracket on two targets. Tabuu will attempt to smash the players together, nearly always resulting in a double OHKO. The same happens if both players are trapped in the cage.
**Off Waves (guaranteed; waves and Winged Tabuu's body hitbox).

The following will cause an OHKO on every difficulty:
*Meta Ridley's Falcon Flyer Smash and Falcon Flyer Stamp. These attacks will also drag the player past the bottom [[blast line]] for a guaranteed KO. In any case, the only way to survive is by jumping.
**However, contact with Meta Ridley while it's rising after Falcon Flyer Smash will send the player past the blast line for a guaranteed KO, forcing the player to pay attention before landing.
*Several of Tabuu's moves:
**Rapid Chop if most hits connect (always needs the last slash to land for a KO).
**Bullet Rain if both hitboxes land (highly damaging bullets and the huge energy sphere).
**Off Waves (sweetspot or contact with Winged Tabuu). It is nearly always guaranteed on lighter characters even if the player is far from Winged Tabuu (but not offstage), specifically characters not heavier than {{SSBB|Lucas}}. It is possible to reduce the knockback by [[DI]]ing, but it will still OHKO any onstage character as heavy as {{SSBB|Zelda}}. Ironically, the chances to survive are higher it the player is closer to the blast lines (but not too near).
***Even the [[sourspot]] always OHKOs on Normal difficulty and above.
*These small hitboxes always deal a guaranteed KO:
**Touching the sparkling spheres of Porky Minch's Lightning and Energy Beam, or jumping on Porky during these moves.
**Standing on Duon while Jump Crash is performed.
**Touching Tabuu's hand when he shoots the huge energy sphere during Bullet Rain attack (always noticed due to the red flash).

Meta Ridley's Falcon Flyer Pull on every difficulty is not an OHKO in conventional terms, since it simply drags the player past the bottom blast line for a guaranteed KO. The only way to survive is by jumping. Ridley's Blasting Roar, Porky Minch's Dash and Galleom's Shockwave can also carry the player past the side blast lines, but only under certain conditions and can be easily avoided.

====Others====
*In [[The Subspace Emissary]], when [[Auroros]]'s sky-diving attack fails to hit the player, its beak gets stuck in the ground. Players can pull it out and use it as a thrown [[item]], like a javelin or a spear. A thrown Auroros deals very high knockback and damage, enough to defeat several enemies at 0%. Apparently its power is comparable to that of many one-hit KO moves, but it can never be truly tested outside The Subspace Emissary. Furthermore, on higher difficulties, an Auroros cannot be thrown far before being destroyed, and on Intense, it can never hit enemies.
*The [[Sandbag]] used in the [[Stadium]] for [[Home-Run Contest]] gains OHKO power when smashed with a very powerful attack (such as {{SSBB|Ganondorf}}'s aerial reverse [[Warlock Punch]]). However, this item can never be used outside the Stadium, except in [[Training]].
*In [[Cruel Brawl]], almost all the 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, kicks and a very high number of moves. Each of the Alloys has also more powerful specific attacks, such as kicks for the Blue Alloy or punches for the Red Alloy, which are both a guaranteed OHKO from the center of the stage even for {{SSBB|Bowser}}. A similar type of strengthening (or slightly lower) was seen in ''Melee''. Also, the [[Shadow Bug|Shadow Clones]], [[False character|Subspace Copies]] and [[Boss|opponents]] battled in The Subspace Emissary are powered up this way on the higher difficulties only.

====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, though mostly playable [[character]]s' moves. Also, {{SSB4|Bayonetta}}'s [[Infernal Climax]] becomes the first playable character's move capable of an [[Instant KO]].

====Playable characters' standard moves====
*{{SSB4|Roy}}'s fully charged and almost fully charged [[Flare Blade]] (sweetspot).
*{{SSB4|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three medium power projectiles or a 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:
**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, KOing a character as light as {{SSB4|Jigglypuff}} at 12%. Also, {{SSB4|Ganondorf}}'s reverse aerial [[Warlock Punch]] is the most powerful non-OHKO attack, KOing {{SSB4|Mario}} from the center of [[Final Destination]] as low as 1% on its [[sweetspot]], though it can easily KO all lighter characters at 0% when sweetspotted. With [[rage]], it eventually gains OHKO power.

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

====Final Smashes====
*Marth and Lucina's [[Critical Hit]].
*Some of [[Giga Mac]]'s attacks when fully charged and [[sweetspot]]ted:
**[[Straight Lunge]], [[up smash]] and [[forward smash]] (when angled up or horizontally).
*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).
*{{SSB4|Captain Falcon}}'s [[Blue Falcon]] (barely in OHKO threshold, easily [[DI]]ed by holding towards the stage).
*[[Wario-Man]]'s fully charged [[Wario Waft]].

====Items====
*The [[Dragoon]].
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s Explosion after being smash thrown.
*If a [[Hothead]] is powered up significantly by a [[flame]]-based hitbox (30% total or higher), it will gain OHKO power when smash thrown or emitting sparks.
**[[Equipment]] can increase the player's damage, increasing the amount of damage a Hothead can be charged by and thus making it easier to reach OHKO power.
*The [[Black Knight]] item from [[Smash Tour]] will cause smash attacks to have a 30% chance to have 5 times knockback, occasionally turning them into OHKOs.

[[Beetle]], [[Boss Galaga]], [[Kyogre]]'s Hydro Pump and [[Oshawott]]'s Surf can push the players past the [[blast line]]s, but as they inflict no conventional knockback, they are not considered one-hit KOs. The first two can also be easily escaped by button mashing at low percents.

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

While touching a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====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====
The following will usually cause an OHKO on 8.0 or higher [[Difficulty|difficulties]]:
*These [[Master Core]]'s attacks:
**Blast Waves (only used if the player does not defeat it in time: about 45 seconds). Ironically, the chances to survive are higher if the player is closer to the [[blast line]]s.
*The final explosion after unleashing the last Blast Wave (very small hitbox). However, it can never truly defeat the players as they have already won by the time the hitboxes land.

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

====Video====
The following video demonstrates all the moves and attacks that KO at 0% in ''Smash 4'':
{{#widget:YouTube|id=Dj5wW5-uFwI}}

===In ''[[Super Smash Bros. Ultimate]]''===
Like ''SSB4'', ''Ultimate'' continues to add OHKOs to the game, though still focusing on playable [[character]]s' moves (while [[Final Smash]]es and [[item]]s have been slightly [[nerfed]] again from the previous 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 and almost fully charged [[Flare Blade]] (sweetspot).
*{{SSBU|Hero}}'s fully charged [[forward smash]] with [[Command Selection|Oomph or Psyche Up]] active (if the sweetspot lands as a critical hit).
*{{SSBU|Kirby}}'s reversed aerial [[Warlock Punch]] (after [[inhaling]] {{SSBU|Ganondorf}}).
*The following [[counterattack]]s:
**Roy and Chrom's [[Counter]], {{SSBU|Joker}}'s [[Rebel's Guard|Tetrakarn]] with [[Arsène]], {{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 [[Reflector|reflected]] projectile when reflected.
*Any throwable item under extreme conditions which cause them to move at a very high speed. An example is {{SSBU|R.O.B.}}'s fully charged [[Gyro]].

====Playable characters' moves (with rage applied)====
*Hero's [[Command Selection|Hatchet Man]] with Psyche Up active.
*Hero's [[Zap|Kazap]] with Psyche Up, Oomph, and Hocus Pocus Giant active.
*{{SSBU|Mr. Game & Watch}}'s [[Oil Panic]] after [[absorb]]ing a very strong projectile (like Hero's [[Frizz|Kafrizz]]).
*Mr. Game & Watch's [[Judge]] #9.
*Ganondorf's reversed aerial [[Warlock Punch]].
*{{SSBU|Lucario}}'s fully charged [[forward smash]], [[aura]] and [[rage]] stack (after patch 9.0).

====Final Smashes====
*Marth and Lucina's [[Critical Hit]].
*Lucario's [[Aura Storm]] at max [[Aura]] if all hits connect.
*{{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]].

Final Smashes executed using [[Final Smash Meter]] always lose their OHKO power, with Critical Hit KOing {{SSBU|Mario}} at 20%.

====Items====
*The [[Dragoon]].
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s Explosion when smash thrown.
*A [[Hothead]] when brought from no charge to significant overcharge by a single [[Flame|fire]] attack that deals over 30% damage. Hothead's damage output depends on the average damage output of the moves used to bring it to full charge, and thus gains OHKO power when overcharged by an extremely powerful fire move. If the Hothead hits opponents while [[spark]]ing, it can OHKO without being overcharged as much, but not when starting from zero charge.
**For example, a fresh fully charged Flare Blade will sufficiently overcharge a Hothead, but doing so in Training with stale moves disabled removes its ability to sufficiently charge it, as the additional 1.05x freshness bonus just barely grants Flare Blade enough damage to do so.
**[[Spirit]]s can increase the player's damage, increasing the amount of damage a Hothead can be charged by and thus making it easier to reach OHKO power.
*The [[Deku Nut]]'s explosion on a grounded target that cannot be stunned, such as [[Sandbag]], or Kirby in his [[Stone]] transformation.

[[Beetle]], [[Boss Galaga]], [[Arcade Bunny]], [[Isaac]], [[Kyogre]]'s Hydro Pump, and [[Oshawott]]'s Surf can carry players into the side [[blast line]], but as they inflict no conventional knockback, they are not considered one-hit KOs. The first three can also be easily escaped by button mashing at low percents.

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

While being hit by a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====Bosses====
The following will usually cause an OHKO on Hard [[difficulty]] only:
*[[Galeem]]'s Lens Flare with weaker or no [[spirit]]s (sweetspot, if most hits chain; 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.<ref>[https://www.youtube.com/watch?v=W5d-BGAls_s The Results Screen is a FULLY PLAYABLE Stage? | Super Smash Bros. Ultimate]</ref>

====Video====
The following video demonstrates all 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, such as [[Instant KO]]s:

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

===Conclusive video===
The following video demonstrates several one-hit KOs from every ''Smash'' game except ''Ultimate'':

{{#widget:YouTube|id=y6_g2_FvFdA}}

==Trivia==
*''[[Brawl]]'' features the most guaranteed OHKOs; however, the vast majority are from [[boss]]es.
*The [[Home-Run Bat]] is the only [[item]] (and by extension, the only attack) able to perform a guaranteed OHKO in every ''Smash'' game, at least on its [[sweetspot]].
*[[Roy]]'s [[Flare Blade]] and [[Counter]] are the only moves to maintain their OHKO power in every installment.
*At least one playable character from the {{uv|Fire Emblem}} universe possesses a move with OHKO potential in every game. Other main characters appear as items with OHKO power ([[Black Knight]] in ''[[Smash 4]]'').
*[[Marth]]'s [[Critical Hit]] is the only Final Smash to maintain its OHKO power in every installment. Throughout all games, it is also the most powerful attack of any character's standard moveset (in terms of knockback) without any exterior factors or buffs, being impossible to survive if in direct sight of a blast line, even on the largest stages of each game.
*While the majority of OHKOs will fail to work on characters under the effects of a [[Super Mushroom]] or [[Metal Box]], a few attacks have such high knockback that they will still OHKO under these circumstances. In ''Brawl'', this includes [[Suicune]]'s Aurora Beam, Marth's Critical Hit, the [[Ultimate Chimera]]'s bite, and several [[boss]] attacks.
**These attacks in ''Brawl'' have such immense knockback that it is possible for the main victim(s) to OHKO other opponents by simply knocking into them.
**Starting from ''Smash 4'', a few Final Smashes have hitboxes that negate the effects of such buffs, such as Marth's Critical Hit.
*Tabuu on Intense difficulty in [[The Subspace Emissary]] has more OHKOs than any other boss or enemy in all the ''Smash'' games, with 14. His OHKOs are reduced to 12 on Intense difficulty in [[Boss Battle]]s.
**Considering Tabuu has only 16 attacks, 88% of his moves are potential one-hit KO moves.
**Tabuu has only one non-OHKO attack on Intense difficulty: Eye Lasers, which KOs well below 50%. Normal Teleport cannot harm the player in any way.
*Apart from Tabuu, other bosses that have a notable amount of OHKO moves (in ''Brawl'' only) include [[Duon]] (with 9), [[Galleom]] and [[Rayquaza]] (with 8 each), and both {{SSBB|Master Hand}} and {{SSBB|Crazy Hand}} (with 7 each plus 3 combined). All the other bosses in ''Brawl'' have 6 or fewer OHKOs.
**Combined Master Hand and Crazy Hand have access to 17 potential OHKO moves on Intense difficulty in ''Brawl'', although some of them need multiple hits to connect to KO at 0%. This also results in their combined attacks occasionally being two OHKO moves.
**86% of [[Porky Minch]]'s moves (6 out of 7) and 80% of Rayquaza's (8 out of 10) are potential one-hit KO moves. However, Rayquaza's OHKOs are nearly always situational.
**Every main boss in ''Brawl'' (10 total) is capable of OHKOs under certain conditions, at least on Intense difficulty in The Subspace Emissary or [[Classic Mode]]. In Boss Battles, however, only 7 maintain this power.
*The most powerful moves in the ''Smash'' series are Tabuu's Off Waves (waves and contact with his body) on Intense difficulty in The Subspace Emissary and Boss Battles, and the Ultimate Chimera's bite in ''Brawl''. Both these attacks are the most damaging moves, dealing 100%-200% damage and having immense knockback.
*Master Core's final explosion on 8.0 difficulty or above is the only OHKO that will never KO the player, since the battle is already won before the hitboxes land.
**Duon's Vacuum Spin, some of Porky Minch's attacks, contact with Porky Bots, Galleom's Tank Rush and Tank Rush & Slam can hit the player after the boss is defeated (with OHKO power on the higher difficulties), but since the battle is already won, the player can never be KOed.

==References==
{{reflist}}

[[Category:Attacks]]
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