Batman Returns - Platform: Super Nintendo

Extra lives
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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
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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
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Press Up(8) at the title screen. 

Level select
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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.