HCRAYERT – Input this password and you will have more than 40%, 21,000 Hero points with swing speed and Win Zip upgrades, and Big Game Hunter, Alien Buster, Shock Absorber.
HCRAYERT – Input this password and get 44% completion.
Fight Calypso in Battle Arena:
Upon finishing the game and unlocking the Battle Arena (by purchasing from Spidy Store), go to the arena and fight 3 timed battles and 3 endurance battles. Upon completing them, Boss Mode will be unlocked. In this mode, you fight several different bosses found throughout the game at one time. One of the hidden surprises is that Calypso participates in the battle as well, even though she’s not in the game.
Bruce Campbell Sayings:
After you’ve swung through the city and found all 213 hint markers, each time you go to a hint marker after the final one Bruce Campbell will say something different.
HCRAYERT – Input this password and you will have 20100 hero points, Swing Speed 6/8, Web Zip Aquired and the following awards: Big Game Hunter, Alien Buster, Shock Asorber, Tentacle Wrangler. You will also have 44.38% of the game completed.
All levels – Finish the game once
All moves – Finish the game once. You will gain a new option which lets you unlock all moves.
Everything else is just unlockable stuff, and not so much cheats or whatever. The password is the same for all three systems, and the GBA version seems to only have those two special features.