Cheat mode
Successfully complete the indicated task to unlock the corresponding cheat:

All Weapons:
Successfully complete all four Greece Time Trials.

Golden Shotgun:
Successfully complete all three Lost Island Time Trials.

Infinite 50 Caliber Pistol Ammo:
Successfully complete all four Peru Time Trials.

Infinate Breath:
Successfully complete the game on the Easy difficulty setting.

Infinite Health:
Successfully complete all three Egyption Time Trials.

Infinite Mini SMG Ammo:
Successfully complete all three Egyption Time Trials.

Infinite Shotgun Ammo:
Successfully complete all four Greece Time Trials.

Show Enemy Health:
Successfully complete all four Peru Time Trials.

Silver Mini SMGs:
Successfully complete all three Lost Island Time Trials.

Sunglasses:
Successfully complete the game on the Easy difficulty setting.

Textureless Mode:
Successfully complete the game on the Easy difficulty setting.

Bonus costumes
Successfully complete the indicated task to unlock the corresponding costume:

Camouflage:
Get the Relic from the Temple Of Khamoon.

Catsuit:
Get the Relic from the Sanctuary Of The Scion.

Classic:
Get the Relic from the Lost Valley.

Croft Manor Sport:
Get the Athenian Owl Relic from Midas's Palace.

Doppelganger:
Get the Relic from Natla's Mines.

Golden:
Get the Griffin-Head Relic from Midas's Palace.

Legend:
Get the Relic from the Mountain Caves.

Scorched Natla:
Get all Relics.

Swimsuit from Tomb Raider 2 (Maria Doria level):
Get the Relic from the Great Pyramid.

Movies
Successfully complete the indicated chapter to unlock the corresponding movie:

A Heated Interrogation: Peru
A Tough Choice: Lost City
Ambushed!: Egypt
Arrival at Khamoon: Egypt
Arrival at St. Francis' Folly: Greece
Business Banter: Greece
Croft Manor: Croft Manor
Doppelganger Demise: Lost City
Down But Not Out: Lost City
Final Confrontation: Lost City
Introducing Natla: Peru
Island Arrival: Lost City
Island Escape: Lost City
Kold and Kid: Lost City
Larson Dies: Lost City
Late Night Reccoinsance: Peru
Motorcycle Pursuit: Egypt
Pierre's Demise: Greece
Retrieving The Scion: Egypt
Shadow Figures 1: Greece
Shadow Figures 2: Greece
The Awakening: Peru
The Banishment Of Natla: Egypt
The End Of The Line: Lost City
The Power Of The Scion: Lost City
The Tomb Of Qualopec: Peru
The Tomb Of Tihocan: Greece
Time to Leave: Lost City
Unexpected Company: Peru
Vilcabamba: Peru
Wolf Attack: Peru

Saving Medipaks
If Lara is low on health and do not want to use a Medipak, wait until you get to a checkpoint. Then, save the game and load it. This will take you back to where you just were with a full health bar. This is useful as it saves Medipaks which you need later in the game. Alternately, if Lara is low on health and you do get to a checkpoint, kill Lara (for example, jump off a high ledge). This will also take you back to the previous checkpoint with a full health bar.

Turing gold
In Mida's Palace, step onto Mida's hand (which you use to turn the silver blocks into gold), and stay there for a short period of time to be turn into solid gold.

Easy Croft Manor maze
You must go through a maze at Croft Manor to collect Artifacts. The easiest way to go through the maze is to stick to the walls. By doing this, the camera will move to a view on top of Lara, and you can actually see what is on the other side of walls.

Better jumps
When jumping up stairs, pull out your gun(s), but do not shoot. Hop forward, and you will glide smoothly up the stairs.

Attacking raptors safely in Lost Valley
When you slide down the slope and the raptors charge at you, ready to attack, there is a rock where they cannot get you. As soon as you enter the valley, jump on the rock to your left. You will be able to shoot them, and they will not be able to attack you.

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