Cheats for Tomb Raider I & Tomb Raider Unfinished Business (PlayStation)

Cheats
4 Cheats

PAL Cheats
Press Select to go to the inventory screen. Then press these keys in sequence: L2, R2, Triangle, L1, L1, Circle, R2, L2. The press Select to skip to the next level.
 * Level Skip

Press Select to go to the inventory screen. Then press the following keys in sequence: L1, Triangle, L2, R2, R2, L2, Circle, L1.
 * All Weapons and Ammo

'''Alternately, beat the game and then, without quitting, start a new game. You should then have all weapons and ammo.'''

NTSC cheats
Press Select to go to the inventory screen. Then press these keys in sequence: L2, R2, L1, Circle, Triangle, L1, R2, L2. Then press Select to skip to the next level. Press Select to go to the inventory screen. Then press the following keys in sequence: L1, Triangle, R2, L2, L2, R2, Circle, L1.
 * Level Skip
 * All Weapons and Ammo

'''Alternately, beat the game and then, without quitting, start a new game. You should then have all weapons and ammo.'''

What Cheats do I use?
Don't know what cheats to use? Then follow this tutorial to know what ones to use!

1: There are two types and they are called PAL and NTSC.

2: Check on the Game Case for a piece of text.

3: It should say PAL or NTSC

4:If it says PAL, then use the PAL cheats. If it says NTSC, then use the NTSC cheats.





5: If you look carefully at both of them, you can see it says PAL on the right one and NTSC on the left one.

Source
http://tombraiders.net/stella/cheats/TR1cheats.html