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Hidden Left 4 Dead trailer
Remain idle at the game selection screen. After a few minutes, a demo video of one of the games will begin. After the video ends, wait for the next video to begin, which will be a Left 4 Dead trailer.
Half-Life 2
Level select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.
Restore health
While playing the game, press Up(2), Down(2), Left, Right, Left, Right, Circle, X to spawn a medpak that will restore 25 points of health.
Refill ammunition for current weapon
While playing the game, press Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1 to spawn an ammunition cartridge for your current weapon.
No clipping mode
While playing the game, press Up(3), L1, Up(3), R1, Up(2).
Enemies do not target you
While playing the game, press Down(3), L1, Down(3), R1, Down(2).
AA
While playing the game, press Triangle, Up, Triangle, Right, Triangle, Down, Triangle, Left, Triangle, Up.
Alternate title screen
Successfully complete the game to alternate the title screen.
Getting past turrets and other dangerous enemies
When you need to run a long way and have some objects with you (for example, a non-explosive barrel), if you have the Gravity Gun, use it as cover, and run (while facing the enemy) to the other side. Then if possible, shoot the barrel at the enemy. Note: Make sure there is only one enemy when doing this. Also, make sure the object is indestructible, and most importantly, look at the enemy and see if you can kill it with one shot.
Half-Life 2: Episode One
Level select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.
Restore health
While playing the game, press Up(2), Down(2), Left, Right, Left, Right, Circle, X to spawn a medpak that will restore 25 points of health.
Refill ammunition for current weapon
While playing the game, press Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1 to spawn an ammunition cartridge for your current weapon.
No clipping mode
While playing the game, press Up(3), L1, Up(3), R1, Up(2).
Enemies do not target you
While playing the game, press Down(3), L1, Down(3), R1, Down(2).
Half-Life 2: Episode Two
Level select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.
Restore health
While playing the game, press Up(2), Down(2), Left, Right, Left, Right, Circle, X to spawn a medpak that will restore 25 points of health.
Refill ammunition for current weapon
While playing the game, press Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1 to spawn an ammunition cartridge for your current weapon.
No clipping mode
While playing the game, press Up(3), L1, Up(3), R1, Up(2).
Enemies do not target you
While playing the game, press Down(3), L1, Down(3), R1, Down(2).
Hidden pumpkins
Set the system date to October 31. After you are ambushed by Hunters and Combine at a big house, drive along the road. Near where the supply cache is found, you will see an old truck. Go up to it, and there will be lots of pumpkins lying on the ground.
Portal
Level select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.
Create box
While playing the game, press Down, Circle, X, Circle, Triangle, Down, Circle, X, Circle, Triangle.
Fire energy ball
While playing the game, press Up, Triangle(2), Square(2), X(2), Circle(2), Up.
Alternate title screen
Successfully complete the game to unlock the cake title screen.
ApertureScience.com login
The graffiti in the game are clues for the ApertureScience.com website. Go to the site, and enter "LOGIN" as a command. Enter "CJOHNSON" as a username and "TIER3" as a password. After logging in, type "HELP" for a list of commands. In addition to logging in as "CJOHNSON" (Chell), you can login as anyone desired by typing a username longer than two characters and using "PORTAL" as a password.
ApertureScience.com hidden message
While logged into the ApertureScience.com website, type "THECAKEISALIE" to access a hidden message left by some employees.
Box head pictures
On the level where you get the companion cube after you run past the energy balls and are in the room with the three elevators, there are two doors leading to a catcher and a platform that is pushed out of the wall. Walk up to the platform that is pushed out. Crouch behind it, and walk through the opening. On the left hand side are a group of pictures of people with boxes for heads and hearts around them.
Team Fortress 2
Faster construction
As an engineer, do not wait for your building. Just whack it with the wrench so that it builds faster.
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