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: Episode One
Level select
While playing the game, press Left(4), LB, Right(4), RB to unlock all levels.
Invincibility
While playing the game, press LB, Up, RB, Up, LB(2), Up, RB(2), Up.
Restore health
While playing the game, press Up(2), Down(2), Left, Right, Left, Right, B, A to spawn a medpak that will restore 25 points of health.
Refill ammunition for current weapon
While playing the game, press Y, B, A, X, RB, Y, X, A, B, RB to spawn an ammunition cartridge for your current weapon.
No clipping mode
While playing the game, press Up(3), LB, Up(3), RB, Up(2).
Enemies do not target you
While playing the game, press Down(3), LB, Down(3), RB, Down(2).
Half-Life 2: Episode Two
Level select
While playing the game, press Left(4), LB, Right(4), RB to unlock all levels.
Invincibility
While playing the game, press LB, Up, RB, Up, LB(2), Up, RB(2), Up.
Restore health
While playing the game, press Up(2), Down(2), Left, Right, Left, Right, B, A to spawn a medpak that will restore 25 points of health.
Refill ammunition for current weapon
While playing the game, press Y, B, A, X, RB, Y, X, A, B, RB to spawn an ammunition cartridge for your current weapon.
No clipping mode
While playing the game, press Up(3), LB, Up(3), RB, Up(2).
Enemies do not target you
While playing the game, press Down(3), LB, Down(3), RB, 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), LB, Right(4), RB to unlock all levels.
Create box
While playing the game, press Down, B, A, B, Y, Down, B, A, B, Y. Note: Enabling this code will prevent achievements from being earned.
Fire energy ball
While playing the game, press Up, Y(2), X(2), A(2), B(2), Up. Note: Enabling this code will prevent achievements from being earned.
Fire rocket projectile
While playing the game, press Up, Y(2), B(2), A(2), X(2), Up.
Portalgun ID 0
While playing the game, press Up, Left, Down, Right, Up, Left, Down, Right, Y(2).
Portalgun ID 1
While playing the game, press Up, Left, Down, Right, Up, Left, Down, Right, X(2).
Portalgun ID 2
While playing the game, press Up, Left, Down, Right, Up, Left, Down, Right, A(2).
Portalgun ID 3
While playing the game, press Up, Left, Down, Right, Up, Left, Down, Right, B(2).
Portal placement anywhere
While playing the game, press Y, A, B, A, B, Y(2), A, Left, Right. Note: Enabling this code will prevent achievements from being earned.
Upgrade Portalgun from Blue only to Blue and Orange
While playing the game, press X, B, LB, RB, Left, Right, LB, RB, LT, RT. Note: Enabling this code will prevent achievements from being earned.
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.
Overheating Xbox 360
Play the level where you face off with the laser guided robots. Once you get past the first few robots, you must start dropping the boxes on the robots heads so they fall over. In the little area where you find the first two boxes, crouch and walk behind where the boxes were. You will find a little room with odd music playing and graffiti on the walls that says things such as "The cake is a liar". There also seems to be an Xbox 360 with a pot inside of it. The Xbox 360 is overheating and boiling the water.
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.
Easy achievements
Play a game with just you and a friend. Have your friend let you repeatedly kill him or her to easily get achievements.
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