Boss Rush is one of the unlockable extra game modes for Scott Pilgrim vs. the World: The Game. In this mode, the players fight all the game bosses (including Envy Adams, Lynette Guycott, Robot-01, Super Fighting Robot and all forms of Gideon Graves - only secret boss Mr. Chau is absent from this mode) in a row.
No health is restored between the fights. The players are then ranked in a leaderboard according to the number of bosses they knocked out and the total time counted until the players either defeat the final boss or get defeated by one of the bosses.