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View development team
Enter CHEESE!! as a code.

Expert mode
Enter REALHARD as a code.

Pre-production art
Enter ANCIENT as a code.

Sound test
Enter MUCKE as a code.

View credits
Enter ABSPANN as a code.

Hidden level
Get 1,500 I.Q. points to unlock the Return To Peru hidden level.

Level select
Enter FORGEOFF as a code. Note: Enter FREEPLAY as a code in the PAL version of the game.

Tian Shan River: Unlimited raft repair kits
In the guard house with the two Russians and the wolf, there is an unlimited amount of raft repair kits in the left locker.

Sideways waterwheel
Go to the Tal Shan River level. Go to the elevator cave. Pull the lever to activate the machine, and sometimes the waterwheel will spin like a cog, sideways. Note: Go left, left, and right to get to the factory area.

Unable to use weapons
Go to the Palawaan Island level, jump in the water, swim down, then swim very fast up to the shore so that Indy gets out of the water without putting his hat on. Indy will not be able to use his guns, whip, or any other weapon other than the machete. Jump back in the water and come out properly, and his hat will be put back on.

UFO sighting
Use the whip to loosen the stone ball from the wall in the bonus level. Go down and walk through the hall of snakes again. Climb over the large wall again, jump to the edge where the stone ball previously located. Push the switches to the right in the following order: 4, 5, 3, 1, 2. If done correctly, a door will open and a scene from Close Encounters Of The Third Kind will appear. Look out of the windows to see a UFO.