Cheat Codes
At any time during gameplay, press start to pause, hold
L + R and press up, Y, Y,B, up, A.You'll see the words "Enter Cheat 
Code" appear in the left corner of the screen.
Now enter any of the following codes for the desired cheat.
Note: You must enter the above code each time you enter
one of the codes listed below.

Invincibility-B, Y, Right, A, Z, R.
Infinite ammo-Z, R, up, X, B, A.
100% Adrenaline-X, L, B, Z, L, Y.
Kill stage nemesis-L, Y, L, Z, L, Z.
Collect stage OSS documents-Left, Y, B, A, Down, B
Disable shellshock-Z, R, X, Y, Y, L.
Disable/enable HUD-A, Y, Right, A, Z, B.
Suicde-L, Z, R, Up, A, Z.