Boss is one of the Sub Games in Sonic Adventure, its enhanced port Sonic Adventure DX: Director's Cut, and the 2010 remaster. This Sub Game is accessible to all characters except for Super Sonic, and can be found after the player completes their respective character's Adventure Mode.
In Boss, the character fights all the bosses in the order that were played in that character's story in Adventure Mode. When all of the bosses have been defeated, the times for each boss are displayed on the screen, with the Total time result accumulating all the individual boss times together. If quick enough, the Total time will be posted onto the leaderboard. There are no Emblems to be awarded here.