Temporary unlimited energy:
Press L2 + R2 + R3 simultaneously to have a temporary unlimited energy.
On Eliminate the informer you only have to blow up the small truck. Save your ammo and money and just go forward and to the right to find him.
(supplied by: Havok)
On the mission where you must protect a train (its an early mission) destroy some of the boxes on the train when it comes. Inside one is the part that is to be transported. If you take (press action) it you fail the mission, but it's a cool part. Its like the extension that boosts you downwards, but this one boosts you backwards.
(supplied by: cj86d8vD)