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. 

=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]].
*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, or successfully executes a [[wall|wall tech]].
*The move's [[sweetspot]] does not land (particularly evident for [[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]].

=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 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 almost fully charged or 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). Unlike ''Brawl'', Aeroblast requires more hits to KO at 0%, but its hitbox is very large. Touching Lugia’s body can also lead to a OHKO if multiple hits chain.
*[[Articuno]]’s Sheer Cold (sweetspot).
*A thrown [[Polar Bear]] (sweetspot).
*A [[Green Shell]] gains OHKO power when reflected 3 or 4 times by [[Fox]]'s [[Reflector]].

[[Marill]] 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===
*[[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) and Flying Slap.
*[[Crazy Hand]]’s Fake-Out Slap and Power Punch.
*Master Hand and Crazy Hand’s Crush (if all hits connect), 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 mode|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. The same strengthening, if not even more, will be seen again 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 (mainly [[Pokéball]]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, nearly all [[Tabuu]]'s moves are guaranteed OHKOs in every situation, some of them even in the higher difficulties of [[Boss Battle]]s (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 [[B-reversing|reversed]] or used in midair).
*{{SSBB|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after absorbing three strong projectiles (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 ~40% damage.
**{{SSBB|Marth}}'s Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~45% damage.
*Any counter or [[reflector]] upon countering a sufficiently strong attack or [[projectile]], such as [[Zelda]]'s [[Phantom Slash]] or a [[Green Shell]].

Contrary to common belief, Mr. Game & Watch's [[Judge]] #9 is not a OHKO, having very high knockback but not quite enough to qualify under the required conditions (it usually KOs [[Mario]] starting from 10%). The same applies to Ike's stage 7 Eruption, which can KO [[Charizard]] as low as 8% but doesn't respect the general definition.

===Final Smashes===
*{{SSBB|Marth}}'s [[Critical Hit]].
*{{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 most 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 most 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 a 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. Unlike ''Melee'', a single hit will OHKO the character (without trapping them), but the attack suffers a smaller hitbox. 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 OHKO regardless.
*[[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.
*[[Metagross]]' Earthquake if all hitboxes land (bury, stomp and upward smash). It also has a powerful [[meteor smash]] capable to OHKO nearby midair characters.
*[[Dr. Wright]]’s highest skyscraper.
*[[Knuckle Joe]]'s Vulcan Jab to Rising Break attack.
*[[Lyn]]’s slash (sweetspot). 
*[[Waluigi]]'s Racket Smash, sweetspotted, if all hitboxes land (bury, multiple stomps and finishing kick or blow). It can also OHKO characters by meteor smash.
*Five [[Smart Bomb]]s, [[Bob-omb]]s or [[Blast Box]]es 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. A thrown Pitfall can also meteor smash midair opponents with OHKO Power.
*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.
*A [[Green Shell]] gains OHKO power when countered 3 or 4 times by a [[Reflector]] (for example [[Fox]]'s). This also applies to Green Shells and [[Red Shell]]s obtained by defeating a [[Koopa Troopa]] in [[The Subspace Emissary]] and to [[Shellcreeper]]s in [[Mario Bros.]] stage. Red Koopa Shells are usually more powerful when reflected.
*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.

[[Kyogre]] and [[Piplup]] can [[push]] players past the side [[blast line]], but as they inflict no conventional knockback they are not considered one-hit KOs.

===Stage hazards===
*The [[Ultimate Chimera]]'s bite on [[New Pork City]].
*[[Dialga]]'s Roar of Time and Overheat (or touching Dialga), [[Palkia]]'s Spacial Rend and [[Cresselia]]'s Psycho Cut (at full power before fading) on [[Spear Pillar]].
*The fastest forms of [[Sidestepper]]s (Red) and [[Shellcreeper]]s (both Blue and Pink) on [[Mario Bros.]], or every other version of them when smash thrown. Touching the green [[Flame]]s at high speed is also a OHKO.
*[[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:
*[[Armight]]'s double blade attack.
*[[Auroros]]'s flying attack.
*[[Big Goomba]]' charge.
*[[Boom Primid]]'s boomerang.
*[[Buckot]]'s fire shards (if all hits connect).
*Touching a [[Bullet Bill]].
*[[Bytan]]'s full power charge (at low health).
*[[Cymul]]'s rotating blades (if all hits connect; always need the last slash to land for a KO).
*[[Feyesh]]'s sparkling slash.
*[[Gamyga]]'s laser beam (both complete and incomplete form).
*Touching [[Glice]], [[Glire]] and [[Glunder]].
*The fiery punch of five [[Primid]]s (all except Boom Primid and [[Scope Primid]]).
*[[Puppit]]'s slash.
*The [[forward smash]] of all four [[R.O.B.]]s.
*[[Roturret]]'s projectiles.
*[[Shellpod]]' charge (both armored and non-armor form).
*[[Spaak]]'s thunderbolt (the dark form). 
*[[Ticken]]'s charge.
*[[Towtow]]'s charge.
*Several attacks of [[Shadow Bug|Shadow Clones]] and [[Boss|fighters]], such as forward smash and [[up smash]], but also punches, kicks and many others. A similar type of strengthening is seen in [[Cruel mode|Cruel Brawl]].

The following will cause a OHKO on both Very Hard and Intense difficulties:
*[[Armank]]'s main attack.
*[[Autolance]]'s slash.
*[[Big Primid]]'s [[forward smash]], fiery punch and kick.
*Touching a [[Bombed]].
*[[Bytan|Giant Bytan]]'s full power charge (at low health).
*[[Floow]]'s mind attack (if most hits connect or at full 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 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:
*[[Petey Piranha]]'s Left or Right Cage Smash immediately after Roar (only used once for battle when either cage reaches 2/3 [[HP]]; always noticed due to the red aura). 
*Several of [[Rayquaza]]'s moves at low health (25% or less):
**Blast.
**Extremespeed if all hits connect (sweetspot).
**Lightning Strike if most hits connect.
*[[Porky Minch]]'s Lightning (if most hits connect).
*[[Ridley]]'s Background Ram (sweetspot) and Slamming Rush.
*[[Duon]]'s Jump Crash and Head Sword Chop.
*[[Galleom]]'s Uppercut (sweetspot), Shockwave (first hit only) and Stomping Jump.
*[[Tabuu]]'s Explosive Teleport (blue bursts; red ones KO at 20% or slightly lower) and Ghost Projection.

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

The following will cause a OHKO on Hard or higher difficulties:
*Several of [[Tabuu]]'s moves:
**Golden Bracket. Due to perfectly horizontal knockback, this attack will also cause a guaranteed KO for poor [[recovery]] characters even on Easy difficulty.
**Dragon Laser.
**Chain of Light. If against two [[Player|players]], Tabuu will attempt to smash them together with the Chain, resulting in a potential double OHKO.
**Electrical Shield (sparkles and Tabuu’s body hitbox). Due to perfectly horizontal knockback, this attack will also cause a guaranteed KO for poor recovery characters even on lower difficulties.

The following will cause a OHKO on Normal or higher difficulties:
*[[Tabuu]]’s [[Off Waves]] (guaranteed; waves and Winged Tabuu hitbox). 

The following will cause a OHKO on every difficulty:
*[[Porky Minch]]'s Energy Laser if most hits connect or Porky has low health (25% or less).
*[[Meta Ridley]]’s Falcon Flyer Smash and Falcon Flyer Stamp.
*Several of [[Tabuu]]'s moves:
**Rapid Chop if most hits connect (always need the last slash to land for a KO). 
**[[Off Waves]] (sweetspot or contact with Winged Tabuu). Even the sourspot always OHKOs on Normal difficulty and above.

[[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 is jumping.

[[Tabuu]]'s Bullet Rain is always a KO on every difficulty if the player is hit both by the first (high-damaging bullets) and the second attack (explosive sphere). However, since the two attacks are separated by a two-seconds interval when the player is free to move, this move can't be considered a OHKO on all difficulties. The same applies to Tabuu's Electrical Shield: on lower difficulties only, when the players touch Tabuu's body they will simply flinch, although they can be sucked in repeatedly by the attack.

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 most hits connect) and Flying Slap.
*[[Crazy Hand]]’s Fake-Out Slap and Power Punch.
*Master Hand and Crazy Hand’s Crush (if most hits connect), Flying Punch (sweetspot), Jetstream (sweetspot) and Sandwich Punch (guaranteed).

The following will cause a OHKO on both Very Hard and Intense difficulties:
*Combined Master Hand’s and Crazy Hand’s Applause (if most hits connect) and Sandwich Punch (sweetspot).

===Boss Battles (bosses)===
The following will usually cause a OHKO on Intense [[difficulty]] only:
*[[Porky Minch]]'s Dash (sweetspot).
*[[Duon]]'s Sword Blast (sweetspot; the hit itself, not the shockwave) and Vacuum Spin (if most hits connect).
*[[Meta Ridley]]’s Mega Fire Ball (sweetspot).
*[[Galleom]]'s Tank Rush and Slam (sweetspot; only used by Tank Galleom at very low health), Falling Body Slam (sweetspot) and Tornado Spin (if most hits connect).
*[[Tabuu]]’s Shuriken Boomerang (both hits), Shark Blade (blade and Tabuu’s body hitbox), Pinpoint Explosion and Bullet Rain (second attack).

The following will cause a OHKO on both Very Hard and Intense difficulties:
*[[Porky Minch]]'s Energy Laser if most hits connect or Porky has low health (25% or less).
*Several of [[Tabuu]]'s moves:
**Golden Bracket. Due to perfectly horizontal knockback, this attack will also cause a guaranteed KO for poor [[recovery]] characters even on Normal difficulty.
**Dragon Laser.
**Chain of Light. If against two [[Player|players]], Tabuu will attempt to smash them together with the Chain, resulting in a potential double OHKO.
**Electrical Shield (sparkles and Tabuu’s body hitbox). Due to perfectly horizontal knockback, this attack will also cause a guaranteed KO for poor recovery characters even on lower difficulties.

The following will cause a OHKO on Hard or higher difficulties:
*[[Tabuu]]’s [[Off Waves]] (guaranteed; waves and Winged Tabuu hitbox). 

The following will cause a OHKO on Normal or higher difficulties:
*Several of [[Tabuu]]'s moves:
**Rapid Chop if most hits connect (always need the last slash to land for a KO). 
**[[Off Waves]] (sweetspot or contact with Winged Tabuu). Even the sourspot always OHKOs on Hard difficulty and above.

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

[[Tabuu]]'s Bullet Rain is always a KO on every difficulty if the player is hit both by the first (high-damaging bullets) and the second attack (explosive sphere). However, since the two attacks are separated by a two-seconds interval when the player is free to move, this move can't be considered a OHKO on all difficulties. The same applies to Tabuu's Electrical Shield: on lower difficulties only, when the player touches Tabuu's body they will simply flinch, although they can be sucked in repeatedly by the attack.

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

===Others===
*In the [[Subspace Emissary]], these [[hazard]]s are a guaranteed OHKO on every [[difficulty]]:
**Touching the hull of [[Battleship Halberd Bridge|The Halberd]].
**Touching very powerful [[flame]]s.
*The [[Sandbag]] used in the [[Stadium]] for [[Home-Run Contest]] gains OHKO power when smashed with a very powerful attack (such as [[Ganondorf]]'s reverse [[Warlock Punch]]). However, this [[item]] can never be used outside the Stadium.
*In [[Cruel mode|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 [[Bowser]]. A similar type of strengthening (or slightly lower) was seen in ''Melee''. Also the [[Shadow Bug|Shadow Clones]] battled in the Subspace Emissary are powered up this way on the higher [[Difficulty|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.

===Playable characters' standard moves===
*{{SSB4|Roy}}'s almost fully charged and fully charged [[Flare Blade]] (sweetspot).
*{{SSB4|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:
**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%.

===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]], [[Boss Galaga]] items and [[Oshawott]] can carry 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 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===
The following will usually cause a OHKO on 8.0 or higher [[Difficulty|difficulties]]:
*These [[Master Core]]'s attacks:
**Blast Waves if the player does not defeat it in time (about 45 seconds).
*The final explosion after unleashing Blast Waves (sweetspot). However, it can never truly defeat the players as they have already won by the time the hitbox lands.

{{#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. 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 almost fully charged or fully charged [[Flare Blade]] (sweetspot).
*{{SSBU|Hero}}'s fully charged [[forward smash]] if it lands a critical hit.
*The following [[counterattack]]s:
**Roy and 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.
*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)===
*{{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]].
*Mr. Game & Watch's Judge 9.

===Final Smashes===
*{{SSBU|Marth}} and {{SSBU|Lucina}}'s [[Critical Hit]].
*{{SSBU|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]].

===Items/Enemies===
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s Explosion when smash thrown.
*The [[Dragoon]].
*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===
The following will usually cause a OHKO on Hard [[difficulty]] only:
*[[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}}

=Trivia=
*''Brawl'' alone features much more guaranteed OHKOs than all the other four games combined together: more than double.
*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.
*[[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 sight of a blast line even on the largest stages of each game. In ''Brawl'' its strength is even higher.
*While 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 it will still OHKO under these circumstances. Examples (in ''Brawl'' only) include [[Suicune]]'s Aurora Beam, [[Lugia]]'s Aeroblast, Marth’s Critical Hit, the Ultimate Chimera's bite and several [[enemy]] and 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 every other [[boss]] or [[enemy]] in all the ''Smash'' games, with 13. His OHKOs are reduced to 11 on Intense [[difficulty]] in [[Boss Battle]]s. In particular, Explosive Teleport loses its OHKO power because blue bursts are removed (but the red bursts still KO well below 30%), while Ghost Projection similarly loses power due to it being very difficult to avoid.
**Considering Tabuu has only 16 attacks, 82% of his moveset are potential one-hit KO moves.
**Tabuu's non-OHKO attacks are still very powerful, with Diving Slash being an invariable KO as low as 20% on higher difficulties and Eye Lasers below 50%.
*Other bosses that have a notable amount of OHKO moves include [[Galleom]] in ''Brawl'' (with 6), and both [[Master Hand]] and [[Crazy Hand]] in both ''Melee'' and ''Brawl'' (with 5 each plus 2 combined).
**Combined Master Hand and Crazy Hand have access to 12 potential OHKO moves on the highest difficulty of ''Melee'' and ''Brawl'', although most of them need sweetspots or multiple hits to connect to KO at 0%. This also results in their combined attacks occasionally being two OHKO moves.
**Every boss in ''Brawl'' (10 total) is capable of a OHKO under certain conditions, at least on Intense difficulty in the Subspace Emissary. In Boss Battles, only 5 mantain this power.
*The most powerful boss-related 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''. All these attacks deal 100%-200% and immense knockback. Off Waves are so strong that it OHKOs even on the lower difficulties of the Subspace Emissary (Easy) and Boss Battles (Normal).
*''Brawl'' introduced the trend of "final bosses" having extremely powerful attacks that feature waves in some form, and are usually a OHKO (on higher difficulties only, except for Tabuu). These include Winged Tabuu’s Off Waves, [[Master Core]]'s Blast Waves and [[Galeem]]'s Lens Flare.
*Master Core’s final explosion is the only OHKO that never KOs the player, since the battle is already won before the hitboxes land.
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