USB Gecko is a cheat device for the Wii that allows for considerable modifications to Wii games. Contrary to popular belief, the use of USB Gecko is not completely identical in function in Brawl in comparison to Action Replay, due to Brawl's lack of a dedicated debug menu. Instead, the player must input hacks directly into the game for them to take effect. Regardless, USB Gecko is still commonly used by Brawl players who yearn to play the game with fewer limitations; the ability to create one's own cheats with the device also makes it a common pick for modders.
The manufacturer of USB Gecko later stopped production and distribution of the device, for reasons that were not clarified; the device, however, can still be purchased secondhand.