Spooky Hidden Rooms:
--------------------
After you have ride through the airfield, and you have got the ladder that
hangs out of the chopper, look with attention to the paintings that hang at
the wall. When you shoot the paintings and all the officedoors, you will
arrive in a strange room.
The End:
--------
Good End: Shoot all the panels of the mothership
Bad End : If you let the mothership escape
Infrared:
---------
If you start the game, only shoot the first three STAAR team members. If you do
this right, you will have an infrared sight.
Secret Rooms:
-------------
Level 2: Shoot all the highest windows in the far wall in the hangar. When you are in
the truck, shoot all yellow barrels, and you will discover another secret room.
Level 4: When you are driving on the STAAR jeep, shoot every yellow box.
Level 5: Shoot the sign which shows the words General Weatherby on the second door
right away when this door opens.
Level 7: Shoot all yellow barrels in the first area where the four purple zombies are
throwing barrels.
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.
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 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.
Unlock Harder difficulty:
-------------------------
Successfully complete campaign mode under the Medium difficulty setting.

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.
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 [Down] 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.