Shellshock: Nam '67 Cheats

Go to the Press Start screen and press White,
Black, L, R, L, White, White, Black, L, R, R, Black

At the "Press Start" screen, press Up, Black, B, Left, Y, X , White ,L, B ,R.

At the title screen where it says press start. Push in on the right thumb stick, then push in on the left thumb stick, then direction pad right, direction pad left, then L button, R button, push in on right thumb stick, push in on left thumb stick, direction pad right, direction pad left, L button, R button.
If done correctly a bar will come across the middle of the screen saying God mode activated. Then press the a button and start the game as normal.

Enter the following codes at the title screen:

-Acid Trip Mode-
Up, Black, B, Left, Y, X , White, L, B , R

-Add weapon option added to the pause
menu-
Up, Down, Left, Right, B, X, Up, Down, Left, Right, B, X

-All Missions and Pictures-
White, Black, L, R, L, White, White, Black, L, R,
R, Black

-God Mode-
Right Thumbstick, Left Thumbstick, Right, Left, L, R, Right Thumbstick, Left Thumbstick, Right, Left, L, R

-Infinite Ammo-
Black, R, Y, White, L, Up, Black, R, Y, White, L, Up

Black, R, Y, White, L, Up, Black, R, Y, White, L, Up

Enter at the title screen:
Up, Black, B, Left, Y, X , White, L, B , R.