Before the "Now Loading" screen with the bird logo comes up, keep R1+Circle 
pressed. This will change the "Now Loading" screen to bouncing CD's.To change 
your plane color.While the bouncing CD's are showing,Up,Down,Left,Right,up,
Down,Left,Right,then R1. Watch for a Namco character at the lower left for 
confirmation.

This code makes your aircraft that you own keep their standard coloring and 
not the obnoxious AirCombat color scheem. Not an exciting tip but kind of fun... 
Hold R1+O during the inital "Loading" screen, you should see flying CDRoms 
instead of the normal screen. While still holding R1+O press U+D+L+R+U+D+L+R 
then release R1+O and press R1 again. A small jet icon should appear in 
the lower left hand corner.

Do the code for the bouncing cd's then press and hold right then press start 10 
times. Now you can changewingman's color.

Do the r1 + O trick as above, at the flying CD's press U, L ,D, R. You should 
see a small dragon in the lower left of the screen. Every time after this, when 
accessing the disc, it shows a game that no one seems to know
how to play.

This cheat is for invincibility, as the game starts pause it, then press 
down,circle,square,square,up,cross and start. You should now be invincible.

On the character select screen press up, L1,triangle, right to play 
as sweet tooth

All Weapons and Full Ammo (For NTSC only):
At any time, press "Select" to go into the inventory screen.
Press "L1, Triangle, R2, L2, L2, R2, Circle, L1" You will hear a sigh
from Lara. Exit from the Inventory screen
and enter again, you will get all the guns and ammo.

Animal Cars:
While the game is loading, hold down L1+R2+START+SELECT
The normal crafts with different animals and things
Pre-Game Codes (In the Menus)
All of these codes are entered in the menus where you would choose 
what the codes refers to.
X= X Button
O= Circle Button
T= Triangle Button
S= Square Button
Piranha Team Accessable:
X X X X O T S
Phantom Class Accessable:
T T T O O O
Eight Tracks Accessable:
S O T O S
In-Game Codes:
These are codes that are entered while in the pause menu:
Machine Gun:
S O X S O X T
Infinite Energy:
T X S O T X S
Infinite Weapons:
X X S S O O T
Infinite Time:
T S O X T S O

Here are all the mission-codes:
Mission 1: WORSTCASE
Mission 2: GRANDTHEFT
Mission 3: GROZNEY
Mission 4: CHERNOBYL 
Mission 5: CIVILWAR

You can use the name of an EA Sports designer, found in the credits, to
create a player and they'll be added to the free agent pool. There's even 
some girls.

Max Fuel and Armor:
LEFT, (Square x 4), UP, (Triangle x 3), RIGHT, (CIRCLE), DOWN,(x) 
(Triangle x 3), (circle)

Max Weapons (999):
LEFT, (Square x 4), UP, (Triangle x 3), RIGHT, (CIRCLE), DOWN,(x) 
(Right1 x 4), (Left1 x 4), (Right2 x 4), (Left2x 4)

B1 Airstrike(killer code!!!!!):
LEFT, (Square x 4), UP, (Triangle x 3), RIGHT, (CIRCLE), DOWN, ((X) x 6)

Mesh Fog Editor:
LEFT, (Square x 4), UP, (Triangle x 3), RIGHT, (CIRCLE), DOWN,(x) 
Down,Down, Down, (Triangle x 3)

Overhead Map Translucency
LEFT, (Square x 4), UP, (Triangle x 3), RIGHT, (CIRCLE), DOWN,(x) 
(Circle x 5)

Invincilbility code:
Pause the Game and Enter L, 4XSquare, UP, 3XTriangle, R,O,D,X,3X, Triangle 
and Square, However, You can still run out of gas so fuel up.