Enter UATUSEES as the cheat code. In this mode, the game will be subtlety changed from level 2 onward.
Stickman Spider-Man
Enter STICKMAN as the cheat code.
Symbiote Spidey costume
Enter SECRTWAR as the cheat code. This costume allows Spider-Man to have unlimited webbing. Alternately, successfully complete the game under any difficulty setting.
Spidey 2099 costume
Enter MIGUELOH as the cheat code. This costume allows Spider-Man to resist double damage. Alternately, collect all comics in the game.