Enter these code during game play, don't pause.
All Weapons, Medkits, Flares & Save Crystals:
L2, R2, R2, L2, L2, L2, L2, R2, L2, R2, R2, L2, R2, R2, L2, L2, R2, L2, L2, R2. Lara screams to confirm correct entry.

Level Skip:
L2, R2, L2, L2, R2, L2, R2, L2, R2, L2, L2, L2, L2, R2, L2, R2, R2, R2, R2, L2. Lara says 'no' to confirm correct entry.

All Secrets & Keys:
L2, L2, L2, L2, L2, R2, L2, L2, L2, R2, L2, R2, L2, L2, R2, L2, L2, R2, L2, L2. Lara says 'no' to confirm correct entry.

Energy \ Health Fill Up:
R2, R2, L2, R2, L2, L2, L2, L2, L2, L2, R2, L2, L2, L2, R2, L2, L2, L2, L2, L2.

Race Track Key In Lara's House:
R2, L2, L2, L2, R2, L2, L2, L2, L2, L2, L2, R2, L2, L2, L2, L2, L2, R2, L2, L2.

Lara's Basement & RaceCourse Key:
Go to the library. When Lara walks in the doorway, there are 2 bookcases to the right. Approach the one on the left & press Action. Lara will pull a book & the fire will extinguish, allowing her to climb up the sidewall inside the fireplace. After reaching the top, follow the passageways until reaching a room with 2 levels, with a switch on the top level. Pull the blocks in a way so that a hallway leading into the attic is revealed. When Lara pulls the switch, the basement door will temporarily open. Quickly run through the attic & down to the main hall to reach the basement. Once in the basement, walk through to the second room & look in the tank on the right side. Inside is the key to the racecourse. To collect it, pull the block in the other room to the center. Climbing up to the hall that leads into the tank.

Shortcut To The Quad Bike:
Head for Lara's outdoor assault course & get to the point where you're about to ride on the zip line, then stop. Walk to the top right corner of the square you are standing in (this is assuming that you are facing the shooting range). Place yourself so that you're standing diagonally facing the perimeter wall. Get as close to the corner as you can then jump straight Up & press the Action Button. Keep doing this until Lara leaps into the air & winds up very high over the course. You shouldn't run around. Turn to the Red square that's floating up in the air & walk to the edge. Move Lara so that she is facing the Red square directly & do a regular standing jump. When on the Red square, move so that she is facing the opposite way that she was facing when she was standing in front of the zip line. Now walk to the corner, facing the back of the course. Press back once, run & jump. If this is done correctly you should be on the roof. From the roof, you can jump into the area where the quad bike is & you don't need a key!