To unlock new arenas, go to the Extras menu and press Y, Y, WHITE, BLACK, BLACK, Y, Y, Y, Y, Y, WHITE, BLACK

To have unlimited health, go to the Extras screen and press: Y, WHITE, BLACK, BLACK, WHITE, Y, BLACK, BLACK, BLACK, Y, Y, Y

To see what it's like to play as evil Buffy (if only in Arena mode), go to the Extras screen and enter this code: BLACK, WHITE, Y, Y, BLACK, BLACK, WHITE, BLACK, BLACK, WHITE, BLACK, BLACK, WHITE, BLACK, BLACK, BLACK, WHITE, WHITE