Custom Mission Map Select
Press Start at the main menu to enter the menu with 'Campaign', 'Custom 
Mission', 'Split Screen', and other options. 

Press L1, R2, L2, R1, Left, Right, Square, Circle to unlock all maps in custom 
mission mode. 

This code also unlocks all difficulty settings for the the practice missions.


Garage: Capturing Emilio Vargas 
In order to capture Vargas you need to move fast. This will cause you to take 
some damage, but to take out enemies quickly use the HE grenade launcher or the 
Red Phosphorus grenade launcher. Use it on groups of enemies as you are chasing 
after him. This works best on the two guards in the cafeteria style room; if you 
have not caught him yet, you can shoot the grenade off the wall and take both out 
without stopping.

Meat Packing Plant: Finding Hidden Enemies
After you rescue the second hostage, you have to go into a giant freezer. Take out 
the guards on the cat-walk then get into the crouching position. Turn on your 
thermal imaging goggles. There will be guards, but they will be blacked out by mist 
and the carcasses of dead cows. However, with the goggles you can see their feet. 
Shooting them in the feet or legs enough times will kill them, saving you and your 
men from exposure.

Stage Select
On the main menu, press START to access the Campaing, Custom Mission, Split 
Screen, etc. choices. Enter L1, R2, L2, R1, D-PAD LEFT, D-PAD RIGHT, SQUARE, 
CIRCLE. You should be able to select any map in custom mission mode (and play 
the practice missions on any difficulty).

Oil refinery:
On the first level that you are in an oil refinery, take an HE grenade launcher as 
your secondary weapon. At the end when the enemies fire RPGs, take it out. Step 
out from under the roof area so that enemy fires an RPG. Three enemies will 
appear. Shoot an HE round to kill them. Move back under the roof, reload you HE 
Grenade launcher, and wait until a second RPG is fired. Move around the corner 
and with your HE grenade launcher and shoot the man that is standing there. Turn 
around, and when the garage door opens, shoot the barrels on the right side with 
your primary weapon. Kill all enemies, secure the hostage, and the level will be 
completed. Note: It recommended that you save the game when you open the 
door that leads to the RPG area.

Hint: Penthouse: Easier kills:
Even though you are told "no shooting" in this level, there is a surprise later where 
you have to shoot to first save someone then escape. Because of this, change 
your secondary weapon to either the Desert Eagle or SR-2. This way you will not 
have to shoot someone four times to kill him with a weak silenced pistol.

Hint: Conserving ammunition:
After every fire fight, reload even if you have 22 rounds remaining. If you keep 
doing this, you should have enough ammunition for the long fire fights and levels.

Hint: Gun guide:
If you are going into a total building level such as the Crespo Foundation, take 
along a shotgun or a submachine gun. The reticule does not shrink as much when 
you move with an assault rifle. You will move around a lot in buildings and room 
clearing. For places like an oil refinery, which has big indoor rooms and some 
outdoor areas, take an assault rifle that is compact to carry a punch but is still 
semi-maneuverable in rooms. In industrial indoor settings, take a sub that is good 
for big rooms and is still effective for small rooms. In total building settings, take 
along a shotgun. Its targeting reticule barely shrinks when you move.

Unlimited Ammunition:
This code is not entered by buttons, but is a trick already incorporated into the 
game. When you get low on ammo for a submachine gun or automatic weapon ( 
including M60s, pistols, or assault rifles,) press O to reload. This may not seem to 
have any effect at first, but to see how it does, look at your clip counter. It might 
say 21, for example, and in bold numbers next to it 13. That means that you are 
expending your 13th round on your 21st clip. If you press O, you will reload to 
your maximum number, but still stay on your 21st clip! This works as many times 
as needed.