Half-Life 2: The Orange Box

Half-Life 2 cheats:
Activate the following cheats by pressing the corresponding sequences of buttons during game play:

CHEAT FUNCTION - CHEAT CODE
AA - triangle, up, triangle, right, triangle, down, triangle, left, triangle, up
Enemies Will Not Target You - down(x3), L1, down(x3), R1, down(x2)
Invincibility - L1, up, R1, up, L1(x2), up, R1(x2), up
Level Select - left(x4), L1, right(x4), R1
No Clipping Mode - up(x3), L1, up(x3), R1, up(x2)
Refill Ammunition - triangle, circle, X, square, R1, triangle, square, X, circle, R1
Restore Health - up(x2), down(x2), left, right, left, right, circle, X
Wireframe Cycle - L1(x2), R1(x2), L1, R1, L1, R1, left, right

Half-Life 2: Episode One cheats:
Activate the following cheats by pressing the corresponding sequences of buttons during game play:

CHEAT FUNCTION - CHEAT CODE
Level Select - left(x4), L1, right(x4), R1
Refill Ammunition - triangle, circle, X, square, R1, triangle, square, X, circle, R1
Restore Health - up(x2), down(x2), left, right, left, right, circle, X
No Clipping Mode - up(x3), L1, up(x3), R1, up(x2).
Enemies Will Not Target You - down(x3), L1, down(x3), R1, down(x2).

Half-Life 2: Episode One Invincible Gnom:
In the first chapter where Alex contacts her Dad, there is an invincible gnome under the table next to the locked door.

Half-Life 2: Episode Two cheats:
Activate the following cheats by pressing the corresponding sequences of buttons during game play:

CHEAT FUNCTION - CHEAT CODE
Refill Ammunition - triangle, circle, X, square, R1, triangle, square, X, circle, R1
Level Select - left(x4), L1, right(x4), R1
Restore Health - up(x2), down(x2), left, right, left, right, circle, X
No clipping mode - up(x3), L1, up(x3), R1, up(x2).
Enemies Will Not Target You - down(x3), L1, down(x3), R1, down(x2).

Half-Life 2: Episode Two Hidden pumpkins:
Set
the PS3 system date to Halloween October, 31. After being ambushed by
Hunters and Combine drive down the road. Go up to the old truck by the
supply cache. There are lots of pumpkins lying on the ground.

Portal cheats:
Activate the following cheats by pressing the corresponding sequences of buttons during game play:

CHEAT FUNCTION - CHEAT CODE
Create Box - down, circle, X, circle, triangle, down, circle, X, circle, triangle
Fire Energy Ball - up, triangle(x2), square(x2), X(x2), circle(x2), up
Fire Rocket Projectile - up, triangle(x2), circle(x2), X(x2), square(x2), up
Level Select - left(x4), L1, right(x4), R1
Portal Placement Anywhere - triangle, X, circle, X, circle, triangle(x2), X, left, right
Portalgun ID 0 - up, left, down, right, up, left, down, right, triangle(x2)
Portalgun ID 1 - up, left, down, right, up, left, down, right, square(x2)
Portalgun ID 2 - up, left, down, right, up, left, down, right, X(x2)
Portalgun ID 3 - up, left, down, right, up, left, down, right, circle(x2)
Upgrade Portalgun - square, circle, L1, R1, left, right, L1, R1, L2, R2

Portal ApertureScience.com login:
Go
to aperturescience.com and enter "LOGIN". Enter "CJOHNSON" as the
username and "TIER3" as the password. After logging in type "HELP" to
display a list of commands. You can also login with any username over
two characters by using "PORTAL" as the password.

Portal ApertureScience.com hidden message:
After logging on to aperturescience.com enter "THECAKEISALIE" to bring up a hidden message.

Team Fortress 2 faster construction:
You can build faster with engineers by hitting the building with your wrench.