Unlock all Extras
At the chapter select screen, hold +, and press Right, Right, Left, Left, 2, 2.
NOTE: Imput code quickly.
Contributed By: kyledude92107.
Hold Extra Grenades
Normally, you're only supposed to hold 6 grenades but when you have a grenade thrown at you you can pick it up and throw it again. Instead of throwing it you can keep it for later by pressing the minus button a second time after picking up a grenade. There's no limitation of grenades when doing this.
Contributed By: ultra_erik.
Unlock Veteran Interviews
Complete the game to unlock interviews from 3 veterans.
Contributed By: Llamaman2.
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.