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Iron Man

Hidden Suits

Classic - Complete "One Man Army vs. Mercs"
Classic Mark I - Complete "One Man Army vs. AIM"
Classic Mark II - Complete "One Man Army vs. Ten Rings"
Classic Mark III - Automatically unlocked
Extremis - Complete "One Man Army vs. Maggia"
Hulkbuster - Complete "One Man Army vs. AIM-X"
Ultimate - Complete Story Mode