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King Kong Gun
SSF2 Luffy - King Kong Gun.png
One Piece symbol.svg
Luffy using King Kong Gun.
Universe One Piece
User(s) Luffy (Super Smash Flash 2)
Type Basic
Effect Luffy enters Gear Fourth to deliver a powerful, long-ranged punch.

King Kong Gun (ゴムゴムの大猿王銃キングコングガン), fully named Gum-Gum King Kong Gun, is Luffy's Final Smash in Super Smash Flash 2.


When performed, Luffy first uses Conqueror's Haki to create a black line of sight in front of him, paralyzing and dealing 10% damage to opponents hit. He then coats and inflates his arm to enter Gear Fourth before compressing his fist into his forearm. After reeling it back, he then delivers a powerful punch, which stretches out to cover a massive horizontal range. Opponents hit by the punch are dealt 31% damage with extreme knockback, which often is enough to one-hit KO. After the punch ends, Luffy returns to his normal form, ending the move.


Luffy using Gum-Gum King Kong Gun in the anime One Piece.

Gum-Gum King Kong Gun is a powerful technique that Luffy uses in One Piece. It can be performed using the Gear Fourth, a technique in which Luffy coats his arm in Armament Haki and blows so much air into his body that he becomes massively inflated, particularly in his muscles. While using Gear Fourth, Luffy's strength, speed, and durability are greatly increased, but he can only use the form for so long before it automatically deactivates and leaves Luffy exhausted, in addition to him being unable to use Haki for ten minutes. Gum-Gum King Kong Gun is a technique Luffy uses in his first Fourth Gear form, Boundman, in which he compresses his fist into his enlarged forearm, blows more air into it to increase its size, and then unleashes a massively powerful punch. It is one of the most powerful techniques Luffy has ever utilized in any form.

Luffy using Gear Fourth against Charlotte "Big Mom" Linlin in the manga One Piece.

The pose Luffy makes during the Final Smash is based on a pose he makes during his fight against Charlotte "Big Mom" Linlin in chapter 871 of the One Piece manga, in which Luffy attempts to land a punch with Gear Fourth that gets blocked. The kanji text that hovers over him if the attack connects reads "ドオン!!", a common sound effect that is found in the One Piece manga, including the aforementioned chapter, and in fighting games such as One Piece: Super Grand Battle! X and One Piece: Burning Blood.




  • During development, it was heavily considered for Luffy's Final Smash to be based on his Ultimate Attack from the game J-Stars Victory VS, which uses Gear Third. However, this was changed following the introduction of Gear Fourth in One Piece.
Luffy's special moves
Neutral special move Gum-Gum Pistol
Side special move Gum-Gum Rocket
Up special move Gum-Gum Snap
Down special move Gum-Gum Balloon
Final Smash King Kong Gun