Indiana Jones and the Emperors Tomb Cheat, Codes

Cheat: Hold 3 Grenades At a Time
You can only hold two grenades at a time. If you need to hold one more, do this: make sure you have two grenades in your satchel. Grab a third one; it will not let you put it in. Instead, he will drop it. Hold it in your hand and jump into water deep enough for you to swim. When you get out of the water, check your inventory. Under grenades, it will say 3/2.

Cheat: Invincibility and Unlimited Ammo
On the "New Game" and "Load Game" screen, hold L + R and press UP, UP, DOWN, UP, A, X, A, B, UP, DOWN, Y, START.

Hint: Avoid Damage From Falling
To avoid damage from falling, enter Combat Mode just before you hit the deck, and you wont incur any harm.

Unlockable: Art Gallery
To unlock the Art Gallery, find all of the artifacts in the game.