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This article is about the effect called "flinchless". For the hitbox flag of the same name, see Windbox.

Flinchless is an attack effect in the Super Smash Bros. series that debuted in Super Smash Bros. Brawl but went unused until Super Smash Bros. 4. In Brawl, a character hit by a flinchless attack doesn't experience flinching, knockback, or hitlag. Starting in Smash 4, characters will also be momentarily stopped in place along with the other effects.

Upon being hit (in Smash 4 onwards), the character will have all of their movement halted and will later resume as if they weren't hit by anything. Attack's hitbox will still be active and be able to deal damage, while attacks that create projectiles (such as Fire Breath) will stop creating more projectiles for the duration. The duration of the pause is equal to the attack's base knockback in frames—for example, a base knockback of 5 results in 5 frames (1/12th of a second) of frozen movement.

The flinchless effect is not to be confused with attacks like Fox's Blaster or the 1 card of Mr. Game & Watch's Judge, which have zero knockback (thus no flinching) and none of the other properties of the effect.

List of flinchless attacks[edit]

Character Move(s) Duration Games
Mega Man Crash Bomber (stick) 5 frames Super Smash Bros. 4Super Smash Bros. Ultimate
Sephiroth Supernova (stun and sleep only) 0 frames Super Smash Bros. Ultimate