Level skip (NTSC version):
Have Lara perform the following actions during game play. (Note: To sidestep, hold R2 and press the D-Pad in the indicated direction. To walk, hold R1 and press the D-pad in the indicated direction. Both R1 and R2 should be released when spinning or jumping.) Sidestep left, sidestep right, sidestep left, walk one step back, and walk one step forward. Release R1, then spin at least three times in a complete circle in any direction. Finally, jump forwards and turn around in mid-air by pressing Up + Square, Circle (assuming the default controller configuration).
Level skip (PAL version):
Have Lara perform the following actions during game play. (Note: To walk, hold R1 and press the D-pad in the indicated direction. R1 should be released when spinning or jumping.) Press L2 to light a flare. Walk one step forward, walk one step back. Release R1, then spin at least three times in a complete circle in any direction. Jump forward by pressing Up + Square (assuming the default controller configuration).

All weapons (NTSC version):
Have Lara perform the following actions during game play. (Note: To sidestep, hold R2 and press the D-Pad in the indicated direction. To walk, hold R1 and press the D-pad in the indicated direction. Both R1 and R2 should be released when spinning or jumping.) Sidestep left, sidestep right, sidestep left, walk one step back, and walk one step forward. Release R1, then spin at least three times in a complete circle in any direction. Finally, jump backwards and turn around in mid-air by pressing Down + Square, Circle (assuming the default controller configuration).

All weapons (PAL version):
Have Lara perform the following actions during game play. (Note: To walk, hold R1 and press the D-pad in the indicated direction. R1 should be released when spinning or jumping.) Press L2 to light a flare. Walk one step forward, walk one step back. Release R1, then spin at least three times in a complete circle in any direction. Jump back by pressing Down + Square (assuming the default controller configuration).

Unlimited flares:
Enable the "Level skip" or "All weapons" codes. Then, press Triangle to draw Lara's guns and press L2. A flare will appear, even if none are in Lara's inventory.

Exploding Lara:
Have Lara perform the following actions during game play. Walk one step forward, one step backward, hold walk while spinning three times in a complete circle in any direction, and jump backward.

Leaving the mansion:
(submitted by: MadHaTTeR)
Get to the point on the training course before Lara goes down the death slide. Walk to one of the corners at the edge and face forward. Turn about forty-five degrees and look straight down. While still holding the look button, jump straight up in the air. After the third jump Lara should be on top of the left or right pillar. From here, jump onto the wall, then run around it. Then Lara can jump to the roof of the swimming pool, maze, and even outside the patch of ground outside the gate. Note: If Lara goes outside the gate, she can not return.

Get rid of the butler:
(submitted by: MadHaTTeR)
Use the following steps to get rid of the butler that always follows Lara. Enter the mansion. Go into the kitchen and open the freezer. Wait until the butler reaches you, and go in the freezer. When he enters the freezer, jump over him and quickly close the freezer door. The mansion may now be explored without the butler.

Get on top of Lara's house:
(submitted by: _IMP_[TML])
Go into the practice level or training level with Lara's house. Head left at the start don't do the practice course. You need to go to the 2nd corner of Lara's House. When you get the the second corner face the wall and keep doing a 1/8 turn and then jump. Don't hold the control pad buttons and hold X while jumping. If you did it right you should then, after a couple jumps be on top of her house. Go around and explore, even do a dive off her house. (You'll die from the impact though)