checked-no =>Unlockable Skins: Complete the requirements to enable these skins. * Abomination: Defeat the Abomination. * Classic Hulk: Find five comic book covers. * Gray Hulk: Smash 7,500 things. * Ironclad: Defeat the U-Foes, trick a U-Foe into beating one of his/her teammates, and defeat Abomination. * Maestro: Destroy a building in each of the New York neighborhoods. * The Professor: Finish all the Jump Challenges.