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Area 51

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.

Note: 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

Sharks with machine gun heads
In the level "The Grays" proceed into the 4th room in the level, where you can see the monorail you entered the level from out the window. Push the computer console there and it will say "Lifter activated". Make your way back outside to the monorail, you can now stand on it. Run all the way to the back of it and you will be warped to a weird room with sharks that have machine guns attached to their heads.

Unlock the Alien Multi-player Avatar
Beat the Campaign mode on the Hard difficulty setting to unlock an alien Gray as a selectable multi-player avatar.

Hidden Warp:
In "The Grays" level, go into the fourth room where you can see the monorail out the window. Use the computer there and a message "Lift Activated" will appear. Then go outside to the monorail and stand on it. Run to the back on the monorail and you will be warped to a new room.

AREA 51 arcade game
On the HOT ZONE mission at the beginning of the level. Hidden in a corner there is the original AREA 51 arcade game complete with red and blue laser-light guns.

Final Secret
Grab all the other secrets to unlock the final secret (page 5)

Easy kills
When your playing in the game to kill mutants easier you kill . Kill mutants without guns with pistols and and kill mutants with guns with machine guns or bombs. Submitted by Joe Fraser Turner

Secret Tapes
Scanning all five databank items in each stage yields one secret. Completing the game yields one secret.

Upgrading The Alien Grenade
In the stage Life or Death, there is a small key on a dead soldier in one of the lifts where Cole starts the stage. Grab it to open the small lockers in the stage. One of the small lockers in the first power conduit pit has a databank item that upgrades the alien grenade (it now homes in on enemies).

Defeating 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.

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

Hard difficulty
Successfully complete campaign mode under the medium difficulty setting.

Gray Alien in multi-player mode
Successfully complete campaign mode under the hard difficulty setting .

Defeating 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

Defeating Thetas:
The best way to defeat a Theta is to first mutate. Next, fire parasites; or if you want to take a chance, fire contagion to lay some heavy damage on him. Note: Use contagion for heavy damage, but parasites also work well, especially because they heal you. When your mutagen runs low, run up and melee him and/or the enemies he releases on you (the "bubbles" or leapers). Keep doing this and he will eventually go down. This will take some time to accomplish and may be difficult at first.

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.

Go to a building behind the crane operations and scan a top secret file. Go back to the secrets in the campaign menu and play Doctor Cray's diary to hear him say something similar to "Man certainly have been to the moon but the horrors of the alien life form that reside there have never been reviled to the public". This refers to the theory is that there is alien life form on the moon and that the government chose to hide from the public

The Grays: Well armed sharks:
Proceed into the fourth room in the level, where you can see the monorail you entered the level from out of the window. Push the computer console there and it will say "Lifter activated". Make your way back outside to the monorail. You can now stand on it. Run all the way to the back of it and you will be warped to a strange room with sharks that have machine guns attached to their heads.

Defeating the Super Theta:
Defeating Super Theta uses generally the same strategy as defeating Theta except for a few things. It is recommended that you ;eave at least one shot in your Meson Cannon for him because of how much damage the weapon will do. Do not worry too much if you miss, because he is still very easy. After you shoot him with the cannon, transform into mutant form and attack him with melee if your health is full or with the parasites if it is not. After a few hits he will get angry then leap up onto one of the four cryo-chambers and break it open, releasing the alien amoebas. These things must be meleed because the parasites will not trace them. Wasting the contagion on them will only drain your energy. They are not too difficult to hit in mutant form, because the "mutant vision" slows them down. Also, do not stand underneath the chamber that the Super Theta is breaking open. Afterwards he will drop almost directly underneath and will deal either fatal or nearly fatal damage when he hits the ground if you are there. However, after he does land, move in close and melee him for a few hits. The amoebas will not drop down immediately. After you kill the amoebas, return to shooting parasites and using melee against the monster. When he jumps off of the second chamber, fire your contagion at him and melee the amoebas that appear to refill your mutagen. This is done after the second one because of the sheer numbers of Black Ops that you fight before him may have severely drained your health. You may want to use the parasites to refill it. If this is not the case, feel free to use the contagion after he breaks the first chamber. After you use the contagion, repeat the process of melee and parasites until the monster dies. At the absolute longest, the fight should take about ten minutes.

Masons and the Illuminati:
Shortly after meeting Dr. Cray, you will reach an infirmary where you will find clones of Mr. White walking around, mumbling, and rambling on. On the back of their lab coats you will find a Masonic lodge (a symbol of the Free Masons) suggesting a connection between the Masons and Illuminati.

Blast The Turrets (Buried Secrets):
Once Cole beats all the guys in the big room with the turrets, all you have to do is run straight at the turrets until you hit the gate. Then just aim up and shoot the turrets until the blow up. The turrets can't shoot back because they can't rotate far enough to aim at you

Invincibility:
Press Up, Down, Up, Down, Left, Right, Left, Right, Down

100% health all the time
Type this code in when game play: R1, R2, L1, L2, Left, Up, Down

100% ammo all the time
Type this cheat in when game play. This cheat gives you 100% ammo all the time on any gun: R1, R2, R3, Left, Right, Down

XM-32 viper assault rifle
Type this cheat in when game play. This cheat gives you a XM-32 viper assault rifle: Left, Right, Down, Left, Right