1. All items:
Left,right,up,down,L2,L2,R2,R2

2. All Weapons:
3 Lefts,right,L2,L1,R2,R1

3. Infinite Ammo:
Down, right,up,left,L2,L1,R2,R2/R1.

After enter one of these cheats you will hear a beep.