Master code:
Enter I WANT IT ALL at the cheat codes screen at the options menu.

Unlimited Superpower meter:
Enter JUICED UP at the cheat codes screen at the options menu.

Empty Superpower meter:
Enter JOR EL at the cheat codes screen at the options menu.

Unlimited health:
Enter FIRST AID at the cheat codes screen at the options menu.

Slow motion:
Enter SLOW MOTION at the cheat codes screen at the options menu.

All level attack mode stages:
Enter SIGHTSEEING at the cheat codes screen at the options menu.

All character biographies:
Enter INTERVIEW at the cheat codes screen at the options menu.

All intermission sequences:
Enter POPCORN at the cheat codes screen at the options menu.

Easier Test Of Strength mode:
Enter SORE FINGER at the cheat codes screen at the options menu.

Disable time limits:
Enter STOP THE CLOCK at the cheat codes screen at the options menu.

Extra hard difficulty:
Enter NAILS at the cheat codes screen at the options menu.

Play as Clark Kent:
Enter SECRET IDENTITY at the cheat codes screen at the options menu.

Play as Parasite:
Enter FEELING DRAINED at the cheat codes screen at the options menu.

Explore Metropolis mode:
Enter WANDERER at the cheat codes screen at the options menu.

Tomato soup mode:
Enter TOMATO SOUP at the cheat codes screen at the options menu.

Low resolution mode:
Enter PEA SOUP at the cheat codes screen at the options menu.

Extras in options:
Enter FEATURE at the cheat codes screen at the options menu.

Reversed controls:
Enter SUPERMAN at the cheat codes screen at the options menu.

Extras in Explore Metropolis mode:
Enable the "Extras in options" code, then enter CREEP at the cheat codes screen at the options menu. This unlocks the shooting gallery and icon hunt challenges in Explore Metropolis mode.

Silent Movie mode:
Enable the "Extras in options" code, then enter RETRO at the cheat codes screen at the options menu.

Underwater mode:
Enable the "Extras in options" code, then enter WIBBLE at the cheat codes screen at the options menu.

Reversed display:
Enable the "Extras in options" code, then enter DOWN UNDER at the cheat codes screen at the options menu.

Alternate credits:
Enable the "Extras in options" and "Extras in Explore Metropolis mode" codes, then enter SGKEL341 at the cheat codes screen at the options menu. Exit out of the options menu, the enter the "Special Features" screen. Select the "?" option to view the alternate credits.

Alternate pick-up icons:
Enter JUST FOR STEVE at the cheat codes screen at the options menu. The icons will appear as fruit instead of Superman logos.