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The original source that confirmed the subject has otherwise become obsolete, outdated or deprecated and has yet to be re-confirmed by an official modern source.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 door 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 door is that it would have appeared in the Mushroom Kingdom level and that it could supposedly be entered by the character. The door shown is also locked, but it is unknown whether all doors or only certain doors would have been this way, and the way to unlock the door has also not been revealed. The door's appearance is very similar to that of the Warp Door from New Super Mario Bros..