Debug mode
 
 When the Namco logo flies on the screen, press L1, R2, R1, L2, Up,
 Down, Up, Down.
 
 Ghost player
 
 Go to the play record screen and enable that feature. Then, start a
 game and play as far as possible. Now enter the gunner battle option
 and press Right(2) to select "Ghost". Start another game to have your
 self as a partner.