(Portal) Aperture Science Login [Easter Egg]
You can find a neat Easter egg hidden in Test Chamber 17. One malfuncitoning wall panel reveals a den with cameras and pictures of cubes. Right of the piston and near the floor of is a user-name and password. Once you have written that down go to www.aperturelabratoies.com. and type login. Enter the user-name and password. Type "Help" if you want to know all you can do.
Passwords that work:

chell	portal
cjohnson	tier3

ApertureScience.com [Easter Egg]
The various grafitti in Portal can help you crack the code for the website www.aperturescience.com. Go to the website (it uses Shockwave Flash) and type in the command LOGIN.
The user name is CJOHNSON and the cheat-password is TIER3. Once you are in, you may type in HELP for a list of valid commands. Have fun!
** You should also be able to login to aperturescience.com with the username GLADOS and the cheat-password PORTAL, as well.
** It actually does not matter what name you login with. You can login with any name you want. It's the cheat-password you insert that is important.
** After logging in, type at the prompt "thecakeisalie" (minus the quotes). Doing so will unlock some secret messages for you to view.

All Levels (Half-Life 2)
Description: Unlock all of the game's levels, insert the following button sequence cheat code on any stage while playing the game:
Left, Left, Left, Left, L1, Right, Right, Right, Right, R1

Restore Health
Description: Restore your health by 25 points
How to: Insert the following button sequence on any stage while playing the game:
Up, Up, Down, Down, Left, Right, Left, Right, Circle, X

Restore Ammo
Restore ammunition on your currently-equipped weapon to maximum.
How to: Insert the following button sequence on any stage while playing the game:
Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1

Fire Energy Ball
While playing the game, press Up, Triangle(2), Square(2), X(2), Circle(2), Up.

Portal - Alternate Title Screen
Successfully complete the game to unlock the cake title screen.

Portal - Create Box
While playing the game, press Down, Circle, X, Circle, Triangle, Down, Circle, X, Circle, Triangle.

Alternate Title Screen
Successfully complete the game to alternate the title screen (Half Life 2)

Level Select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.

Full Ammo for Selected Weapon
While playing the game, press Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1 to restore ammo for your current weapon.

Restore 25 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.

Vortiguant Speech
In the same cave you found the voritguant singing,press B to speak to him.He will give a speech if you keep talking to him.When he starts to repeat himself,leave.
The link below shows you the location.

Note:he will say it if you stand still,but it takes longer.
See the video: Cheat Video

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.

Portal - Level Select
While playing the game, press Left(4), L1, Right(4), R1 to unlock all levels.

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.

PS3 Cheats for The Orange Box

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