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Unlockable: Suits To unlock the following suits for Iron Man to use, complete the requirement listed. * Classic - Complete the challenge "One Man Army vs. Mercs" * Classic Mark I - Complete the challenge "One Man Army vs. AIM" * Classic Mark II - Complete the challenge "One Man Army vs. Ten Rings" * Classic Mark III - Automatically unlocked * Extremis - Complete the challenge "One Man Army vs. Maggia" * Hulkbuster - Complete the challenge "One Man Army vs. AIM-X" * Ultimate - Complete Story Mode in its entirety  
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