Superman

					
Stop Bombs
At the Dam and Daily Planet use Freeze Breath to stop the bombs.
Level Select
After getting the option to save your game hit reset. Now go to Load Game and when it asks you to put in the rumble pak hold L B for a few seconds and press A.
Infinite Powers
At the Title screen press and hold A B CDown CUp then press Start.
Level Skip
At the Main Menu press CUp CDown CLeft CRight CRight. Begin a new game and press Start CUp CDown.