Adventure Mode: The Flash Of Shadows

Adventure Mode: The Flash Of Shadows was the planned downloadable "story mode" extension for the downloadable version of Super Smash Flash 2. Based on The Subspace Emissary from Super Smash Bros. Brawl, it would have consisted of various levels in the style of a side-scrolling platformer in which the player must reach the end while fighting enemies and bosses. Additionally, a story would have been told through pre-rendered cutscenes during and between levels. The story had been developed by several SSF2 Developers known internally as The Flash Of Shadows Writers, led by Suliboy. The story was planned to be about a group of heroes' struggle to defeat a "Shadowy Man" along with his minions known as the "CuBots". Characters would join the player's party according to the story, and allowing unlockable characters to join the party would unlock them.

Due to changes in the staff in late 2010 following the release of v0.6 of the SSF2 Demo, the current story was deemed absurd and obsolete, being scrapped altogether. As of the release of the Beta version on May 29, 2017, the current developer staff has yet to make another announcement about the fate of a story mode in SSF2.

Cutscenes
As previously mentioned, a story would have been told in this mode through pre-rendered cutscenes during and between levels. Of these cutscenes, three have been uploaded to McLeodGaming's YouTube account, McLeodGamingOfficial, although they are now unlisted. Note that these cutscenes are all depreciated and based on the original story for this mode, which is now scrapped. Also note that changes have been made to the game's character roster following the release of v0.7, with Vegeta now removed and Solid Snake and Zero now unconfirmed, and these cutscenes reflect only the initial roster.

Trivia

 * The original logo for this mode is the same as that for The Subspace Emissary from Brawl, though the text has been changed.