Iron Man Codes -
Suits:
Successfully complete the game under the Easy difficulty setting to unlock all suits, including Titanium Man.
Alternately, successfully complete the indicated mission to unlock the corresponding suit.
Classic: Mission 6
Classic Red and Gold: Mission 9
Mark 1: Mission 1
Mark 2: Mission 2
Mark 3: Mission 4
Stealth: Mission 11
Titanium Man: Last mission