Highlight the "Rest" selection on the options screen, then press Up, X, Left, Y, Down, B, Right, A, Up, X on controller two. A tone will confirm correct code entry.
Press Up(8) at the title screen.
Highlight the "Rest" selection on the options screen, then press Up(2), Down(2), Left, Right, Left, Right, B, A, B, A on controller two. A tone will confirm correct code entry. Up to ten lives may now be selected on the options screen.
Enter Y*31 21 3191 11 as a password. Press Left or Right on controller two when the name of the first level, "Stage 1-1, Gotham City Plaza", is displayed to select a new starting level. This may be done at any time during the game.