Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Triangle, Square, Left(2), Circle. A message will confirm a correct code entry. This mode increases challenge levels alot.
An easy way of destroying the clown van is to use the canisters that explode and drop it on either side of the gate in the corner between the wall and the gate (DO NOT THROW IT)Walk away and shoot the canister repeat process until the van is destroyed.It might take awhile but it works.:)
Press the l button to duck the boss's punches and then go back up to punch him out not to kick him his punches will be fast when he is punching and you are laying down he can still get you. When the boss is grabbing you by the neck you have to press a and the b buttons at the same time as fast as u can and you will give him a kick in his neck when he is out of oxygen punch him as much as you can. GOOD LUCK
The fastest way to unlock all the disarms is to holster the gun you are carrying and just disarm everyone you see. Once you disarm the bad guy you now have his gun. HOLSTER IT!!! Now repeat the process until Slade earns all of his disarms. It shouldn't take more than 10 min. to unlock all 5 disarms for all 3 weapons. When you do a disarm and you will see the title of a new one pop on your TV (Disarm should be set on random. FYI the shotgun disarms are the best)
All you have to do in chapter 15 where you have to destroy the GAC chopper is to kill any of those GAC units around your view especially the one far down shooting a bazooka. The M4 machine will do the trick. Continue to murder any GAC unit in sight until the chopper stops sending them. Whatever you do, do not go upstairs or you're dead meat! As soon as the chopper stops sending fools, pick the grenade launcher any any gun you can, walk about three steps toward the water fountain until you're standing on a gray diamond, manual-aim the chopper and empty all your bullets in that chopper. Continue this unitl you're stuck with Shadow or a shotgun. Pick up any ammo around and empty them all into the chopper. You will eventually run out of ammo, but walk to the stairs on you left and crouch. A GAC unit will come running down. Let shadow waste him and get his gun. Then to your right, there should be a pistol up the stairs. Run quickly and get it. Return back to the gray diamond and empty your guns. If you run out again, do the same shadow trick on the right side of the stairs. That should send that chopper down. I tried every other way and I was toast so this was the best way and it only took 5 minutes! Good luck!
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