Art gallery:
Collect all artifacts in the game to unlock an art gallery.

Hint: Avoid falling damage:
Press R as before you hit the ground to enter combat mode. You will not get any damage from falling.

Hint: Pistol whip:
Press X to pistol whip your adversary. Note: This works for all guns, not just the pistols.

Hint: Drink from canteen:
To drink from the canteen, hold A. If you instead tap A, it will take longer. Holding A also helps when you fill your canteen.

Hint: Skip all poachers:
In the level where you start out in a room enclosed by a vine door, cut the door and walk forward. It should start a short intermission sequence of Indy running towards a little window. Skip through it and when it is over, select the whip and jump. While in the air press A. If done correctly, you should now be swinging above a courtyard. Swing to the other side and continue the mission.

Hint: Magical barrier:
Equip the PaCheng and press R to block.

Glitch: Unlimited grenade capacity:
Get two grenades and you will find out that this is all you can normally hold in your pack. However, if you jump into water while holding a third grenade, you will put it in your pack. Repeat this as often as desired for unlimited grenade capacity.

Glitch: Missing hat:
Pause game play and look carefully at Indy to notice that his hat is gone. Look at his forehead during game play, then and look back at his forehead.