Select the "Special" option from the main menu, then choose the "Cheats" selection. Enter
"UATUSEES" as a code to unlock "What If Contest?" mode. In this mode, parts of the
game will change depending on what you do from level 2 onward.

Select the "Special" option from the main menu, then choose the "Cheats" selection. Enter
"MRWATSON" as a code to unlock the Peter Parker costume. Alternately, collect all
the spheres on the top in item hunt training mode, and then go into the pit. Run into a
wall that has a "?" on it all in under one minute. Then, find Peter Parker in the Kraven
room to unlock the costume. Note: This costume only allows two webbring cartridges.
-From: corvo@home.nl

Select the "Special" option from the main menu, then choose the "Cheats" selection. Enter
"CLUBNOIR" as a code to unlock the Ben Reilly costume. Alternately, successfully
play the game through level 4-2.

Select the "Special" option from the main menu, then choose the "Cheats" selection. Enter
"KIRBYFAN" as a code to unlock all game comic covers.