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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.