This article contains information of a formerly confirmed feature.
The original source that confirmed the subject has otherwise become obsolete, outdated or deprecated and has yet to be re-confirmed by an official modern source.
A cannon is an object that was originally planned to appear as a level element in the Adventure mode of Super Smash Flash 2. It was initially revealed in the fifth Smash Flash DOJO!!! prior to its sixth renovation, but along with Adventure, its current fate is a mystery. All that has been revealed about the cannon is that it would have appeared in the Mushroom Kingdom level and that entering it would supposedly lead the character to the level's boss fight.