The Invincible Iron Man Codes -

Invincibility:
Press , , , , , at the main title screen. A sound will confirm correct code entry.

Level select:
Press , , , , , at the main title screen. A sound will confirm correct code entry.

Alternately, successfully complete the game to unlock the "Level Select" selection at the options screen.

Powerful close-range shots:
Press , , , , at the main title screen. A sound will confirm correct code entry.

Unlimited chest plate super blasts:
Press , , , , , at the main title screen. A sound will confirm correct code entry.

All gallery pictures:
Press , , , at the main title screen. A sound will confirm correct code entry.

Alternately, in order to complete the gallery option you must collect all eight images, each in every stage.