Special Smash is a term that refers to several types of versus modes available in Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate. Although it has no appearance in Super Smash Bros. for Nintendo 3DS, many of the Final Battles in Smash Run enable one of the options seen in Special Smash; additionally, voice clip 86 of the announcer in the Sound Test is of him saying "Special Smash", which may indicate cut or planned content. In all iterations through Ultimate, battles played in Special Smash do not count for statistics or the completion of some challenges.
In Melee, Special mode is only played with one special condition at a time.
Special Brawl/Special Smash/Custom Smash
Unlike Melee's Special mode, where only one special condition could be played at any time, Special Brawl , Special Smash , and Custom Smash allow several options to be applied at the same time. It is possible to play without any options enabled, creating a normal match where statistics are not recorded.
In Ultimate, the term "Special Smash" is not used for the mode itself, but for a sub-menu containing Custom Smash and the new mode Smashdown. The 300% and Stamina options are no longer present, as Stamina is now a standard rule option, and 300% is now an expanded standalone mode named Super Sudden Death, also located in the Special Smash menu. And unlike the other modes in Special Smash, its impossible to play on custom stages and to have more than 4 players at a time.