Cheats, Codes & FAQs
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.