Answer:
if your talking about in the spiderman movie game then you do this:
First enter the cheat, ARACHNID to unlock all Of the levels levels.
Start a new game and select hero difficulty.
Once the level begins, pause the game and select "Exit To Main Menu."
Go to the Level Warp, and select Conclusion. After the Conclusion FMV finishes, press Circle to go back to the main menu again, this time go to the secret store, and you will have unlocked all secret costumes, including the Green Goblin (Congrats) Now, turn the Green Goblin costume on and valla