Level skip
While playing a game, press Select to enter the inventory screen. Then, press L2, R2, L1 Circle, Triangle, L1, R2, L2 in the NTSC version of the game. Now press Select to skip to the next level. For the PAL version, press L2, R2, Triangle, L1(2), Circle, R2, L2. This code assumes that the buttons have been left in their default configuration.

All weapons and ammunition reload
While playing a game, press Select to enter the inventory screen. Then, press L1, Triangle, R2, L2(2), R2, Circle, L1 in the NTSC version of the game. For the PAL version, press L1, Triangle, L2, R2(2), L2, Circle, L1. If you entered the code correctly, Lara will sigh. This code assumes that the buttons have been left in their default configuration.

All weapons and infinite ammunition
Beat the game and load any saved level to have access to all weapons, infinite ammunition, and additional enemies.