Stun

For the condition that occurs causing characters to shake back and forth while immobile, see Paralyze.

Mega Man stunned in Super Smash Bros. 4.

Being stunned or dazed (referred to as FuraFura in Super Smash Bros. Melee's debug menu and in-game files for Brawl, after the Japanese onomatopoeia for dizziness), an effect known as dizziness in Brawl, is a special condition that leaves a character immobile for a short period of time.

Summary

When characters are stunned, they are dazed for a few seconds and cannot perform any actions. The only ways for a character to recover is by flinching, waiting out the condition, or by button mashing to reduce duration.

Unlike most other status effects, characters can escape being stunned easier at higher percentages (whereas asleep, for example, lasts longer at higher percentages). In Smash 64, the base time in frames that a character is stunned can be determined by the formula (400-damage)+60.

The sound effect of being stunned is a cartoony tweet sound effect that loops until the condition is stopped. This sound effect debuted in Melee, and its volume was increased in Brawl. In all games, characters also have a flashing red overlay applied to their model; in Smash 4, however, this only happens when a character's shield is broken.

Causes of Stunning

By moves

Moves	Condition	Games
Reflector shattering	Projectile damage increases with each reflection. If overloaded, it will break the character's reflector.
Shield break	If one's shield is overused, it will shatter. If pulled off correctly, Mr. Saturn, Marth's Shield Breaker and Donkey Kong's Headbutt will break opponents' shields and stun them.

By characters

Character	Move(s)	Games
Luigi	Negative Zone (Brings down aerial opponents and stuns them.)
Mewtwo	Disable
Wario	A barely charged Wario Waft as Wario-Man
	Garlic Breath (Custom move)

By items

Item	Attack	Games
Deku Nut	Any attack on the ground
Poké Ball Pokémon	Weavile: False Swipe

By enemies and bosses

Enemy/Boss	Attack(s)	Games
Master Hand	Snapper
ReDead	Scream

By stage

In Wrecking Crew, getting trapped in a barrel and taking a whole bunch of damage will occasionally result in the trapped character being stunned upon breaking out.

Gallery

• 

  Ness in a state of dizziness in the original game.

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  Mario's stun animation in Melee.

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  Falco stunned in Melee.

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  Mario is stunned in Brawl.

Trivia

• Bowser is the only character in Brawl to lack the tweeting sound effect while he is stunned. The reason for this unique property is unknown.
• When Samus is stunned, her Power Suit starts to short-circuit, causing erratic and almost glitch-like movement.