(Half-Life 2) Codes - Enter the code while playing Half Life 2. No specific requirements other then the game. Can be entered at any time on any level.

Code Effect

Up Up Down Down Left Right Left Right O Button X Button Restore Health By 25 Points

R1, Triangle, O, X, Square, R1,Triangle, Square, X, O, R1 Restores ammo for current weapon

Left, Left, Left, Left, L1, Right, Right, Right, Right, R1 Unlock All Levels

(Portal) Codes - Enter the codes at any time during game play.

Code Effect

Down, O, X, O, Triangle, Down, O, X, O, Triangle Create A Cube
Up, Triangle (2), Square (2), X (2), O (2), Up Fire Energy Ball
Left, Left, Left, Left, L1, Right, Right, Right, Right, R1 Unlock All Levels

Unlockables

Different Portal Main Menu - Once you beat portal one time, a different background for the menu is used to commemorate your accomplishment.

Half-Life 2 - Alternate title screen - Beat the game once to get a new title screen for Half-Life 2.

Half-Life 2: Episode 1 and 2 - As you progress through the game and get to new chapters, the title screen changes to show where you are in the game.