Batman Returns

Extra lives: 
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. 
Nine continues: 
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. 
Invincibility: 
Press Up(8) at the title screen.