In order to get infinite ammo you must be at the desert area with the military defeat 2 robots and kill everybody there then go to the fair and then kill 1 cop and thats it.

Ammo a plenty: left,y,white,right,black,x

Bullet proff crypto: x,y,left,left,y,x

Deep thinker: black,white,y,right,white,y

Nobody loves you: white,right,whight,black,x,right

Aware like a fox: right,x,whight,black,right,white

To enable these codes you have to pause the game and hold the left trigger down whist entering the cheat codes.

Unlock upgrades: when your at the mothership hold the left trigger and enter x,y,left,left,y,x

MMmmm brains (increase the ammount of DNA)black,black,white,white,left,right,left,right,white,black
(also do this at the mothership to enable the code).

Pause the game and HOLD THE LEFT TRIGGER and press left(on control pad)y-white-right-black-x this cheat gives you unlimited ammo saucer and all.hope I helped. :-)

All you need to do to destroy any car or truck is tip it on its' side or back. If it does not work just try again. You will see fire on the hood if it works.

Black white hold right trigger and other and up down left rigght

This is not really a cheat, but if you pull the right trigger repeatedly instead of holding it down while useing the death ray, you will never run out of charge.

Pause the game then hold down L, the press left, Y, white, right, black, X.

Hold the left trigger and enter the following: X, Y, Left, Left, Y, X

If you want pick up people with your mind powers and SMASH them into th floor, cars, other people anything .