Area 51 Cheats

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Secret tapes:
Find and scan all five databank items in a level to unlock the secret for that level. The final secret of the game is unlocked when all prior secrets have been found.

Hard difficulty:
Complete campaign mode under the medium difficulty.

Gray Alien in multi-player mode:
After finishing campaign mode under hard difficulty.

You can also finish the game under the easy difficulty setting. Then, go to the last level and complete it under the medium difficulty setting. You will then have the choice to play under the hard difficulty setting. Choose to play the last level under the hard difficulty setting and complete it.

Life Or Death: Alien grenade upgrade:
Search the dead soldier in one of the elevators where Cole starts the level to find a small key. Use it to open the small lockers in the first power conduit pit to find a databank item. It will upgrade the alien grenade so that it will track targets.

How to beat the Super Beast:
When fighting the Super Beast, rather than running straight at him, run around in a circle. When he gets near an explosive barrel, shoot it. It does more damage then the BBG. Watch out for his plasma shooting arm as well. When you finish, Edgar will talk to you, and you get to see him.
User Cheat by ontheoffensive  

How to beat Grays:
To defeat Grays that use shields, mutate and fire parasites at them. It will bring down the shields faster than any other weapon in the game.
User Cheat by ontheoffensive

How to beat Theta:
(get full health before fighting the theta) when you are fighting the theta, run behind one of the blue glowing tank/barrel kinda things. wait for the theta to attack and blow them up. the theta should die and if you have full health you shouldn\'t die, you will then meet edgar.
User Cheat by moomooman

Defeat the first Theta boss easy:
To beat the first theta boss all you need to do is change to mutant and use your melee attack (R3) on him and the leapers. Whenever Theta or the leapers hurt you take a step back and use the leech attack (R1) on them to regain health. Then start using your melee attack (R3) again so you get the mutagen back from using the leech attacks.

REMEMBER: when the Theta steps out of the ring and sits on the side for a little while it means you have taken his health down by 1/3.
User Cheat by ryan235

Hard difficulty:
After finishing the game on normal difficulty you will unlock the hard difficulty.

Interesting scans:
During the training levels, scan everyone that you can. You will find some interesting equipment of the MPs, including adult diapers and condoms. Hold right analog-stick Down (with the default controller configuration, or in the opposite direction in the inverted configuration) until your scanner stops moving and you appear to be looking at your feet. You can now scan yourself and see information about Cole.

Moon Landing Conspiracy:
When you reach "Lies of the Past: Checkpoint 4", you will ascend in an elevator. Exiting the elevator, you will see a replica of the Moon's surface, a model of the U.S. space suit, and a shuttle the United States used to reach the Moon. This is in reference to the Moon Landing Conspiracy, claiming that the U.S. never actually reached the Moon, and faked the landing to beat the Russians in the space race. The conspiracy was heavily debated, but ultimately rejected by the majority of opinions. Today, only a few people still claim the Moon landing was a hoax.

Arcade cabinet:
In the earlier stages of the game, there are a few cabinets of the original Area 51 arcade game, complete with red and blue light-guns.

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