Boss Battle Mode

Boss Battles Mode is an unlockable Stadium mode introduced in Super Smash Bros. Brawl, which is very similar to All-Star Mode, except the player fights all the bosses rather than all the playable characters. Boss battles mode is unlocked after the player completes both Classic Mode and The Subspace Emissary for the first time, or in other words, has defeated each boss at least once.

Overview
The goal of Boss Battles Mode is to defeat every boss in the game with a single stock, or two characters in its co-op mode. When a player begins Boss Battles Mode, they are immediately dropped into combat against one of nine bosses except for Tabuu. Once a boss is defeated, the player is brought to the rest area. The rest area displays all defeated bosses as trophies, a screen that displays the face of next boss to be fought, and has three heart containers, or five in co-op mode, which, like in All-Star Mode, do not reappear even upon later visits to the rest area. This format continues until all bosses are defeated.

This format is mostly the same as All-Star Mode. However, the player is not allowed to continue after losing their stock, as it is a stadium game. The battles occur in random order, except for the final battle, which always occurs last. Each boss has their own stamina bar as one would normally fight them in the Subspace Emissary. The player is treated with a picture of one of the bosses upon completing boss battles: this picture varies depending on the difficulty level chosen. Stickers cannot be used in Boss Battles.