Hold Extra Grenades

You can normally have only two grenades in your pack. But if you pick up a third, then jump into the water, the third grenade can be placed in your pack. This can be repeated to hold lots of grenades.

Contributed by: Phweemaggot 

Extra Ammo

If you find Indy low on ammo, or out all together, just let a bad guy knock the gun from your hands, then pick it up.

Once he grabs it, kick it out of his hands and pick it up.

You will find anywhere between 2 and 6 bullets back in your gun.

Contributed by: holydiver 

(Press Start) screen codes.

Contributed by: jessed75 

Unlock the picture gallery

Contributed by: CharlesBronson 

No Target Mode/Disable enemy AI

Locate your Emperor's Tomb folder (example path C:Program FilesLucasartsIndiana Jones And The Emperor's Tomb)
From there, open the game data folder, followed by the folder marked indy. Finally, open up the file vars.CFG, and at the top of the file, change aiDisabled so it reads as: aiDisabled=true. Once this is done, save the file and enter the game, your enemies are now oblivious to your presence and will no longer attack you

Contributed by: StolenDiagram 

Play two levels not found in the console version of the game...

If you navigate to the default isntall directory of the game, there is a folder that holds every level of the game. In this folder are two files called Ropetest and Whipgym. Run either of these files to play on a level not present in the console version of the game.

Contributed by: Zucot 

Infinite Oxygen, Ammo, & Health

Edit your default.cfg file in in the GameData\Indy directory and add the line ''cheats:1'' to enable Infinite Oxygen, Ammo, & Health. These codes cannot be turned on or off individually in-game.

Note: If you fall to your death or succumb to any other form of insta-kill death with these effects on, you will have to exit to the main menu, as the game will think you are still alive, but you will be unable to continue.

Contributed by: BLATSPLAT 

Unlock a picture gallery

Collect all 30 artifacts throughout the game to unlock a picture gallery.

Contributed by: CharlesBronson 

Drop and Live

When you are falling from heights that will hurt or even kill you, press R1 just before you land. You will enter the combat stance and will lose hardly any life or maybe even none at all.

Contributed by: ureworstnitemare