unlimited rocket launchers
This code is great. If done correctly it will give you unlimited rocket launchers for all levels. At the main menu screen, hold down all four top buttons,(L1, L2, R1, R2) and then press up, down, left, right, circle, circle, square. Then go into the level and press start then put in: circle, square, R1, square, up, circle, down, left. If completed correctly you will have unlimited rocket launchers.

Hint: Full Health
When you are playing, shoot any guard and then get a gun and shoot them in the head while they are dead. A little box will appear, walk over it and watch your life go straight up. Every time you need helth, keep doing it.

Hint: Get To Tunnel [Submitted by: Alex H]
In the last level (12), from starting point, instead of going to activate both remote places to get into the tunnel, you can shoot out a window in the tunnel and jump in front of it, repeatidely pressing jump. If done properly, you can get into the tunnel without falling. NOTE: It is very tricky to do but I am %100 sure it will work. MIGHT NOT WORK ON FIRST TIME