All-Star mode is an unlockable one-player mode in Super Smash Flash along with Classic and Adventure mode. It is a mode that first appeared in Super Smash Bros. Melee and later in Super Smash Bros. Brawl. The goal of All-Star mode is to defeat every playable character in the game with a limited amount of recovery items. In Melee, the order of the characters were randomly chosen while in Brawl, the characters are fought in their respective series in chronological order by release date. Both games allow 3 Heart Containers that, unlike in Vs./Group mode, will heal all accumulated damage (there are five in Brawl if playing in Co-op).
In Super Smash Flash
In All-Star mode, the player must fight all 28 characters in the game roster. They are randomly selected each round, like in the Melee version. At the start, the player must fight one character, then advance to two, then to three. At the end, you fight 3 Mr. Game & Watchs with 8 lives each. When completed, you unlock the Battlefield stage. Similar to Melee and Brawl, there are three Heart Containers but instead these will only heal 100% of damage instead of the full restore heart containers in the previously mentioned games. Because of this, All-Star Mode is significantly harder in SSF than in Melee and Brawl.
In Super Smash Flash 2
All-Star mode has been confirmed to return in Super Smash Flash 2. Its mechanics will be similar to Brawl, with the player fighting the characters in their respective series. The order of the series is currently unknown. Not much is known about this mode in SSF2 yet.