Batman Forever - Platform: Super Nintendo

Cheat mode:
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Press Left, Up, Left(2), A, B, Y at the game start 
screen. Change the game type to normal mode and 
press Start. Choose a character and press Start 
to display the cheat mode screen. This screen allows 
stage selection, access to all weapons, and control 
of the Riddler in the practice mode. 

Kill all enemies:
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Enable the "Cheat mode" code. Press Start + L + R 
during game play to kill all normal enemies. Press 
this sequence multiple times to kill the Boss 
characters.