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The Orange Box: Half-Life 2: Episode Two Hints
PC Cheat Codes
Episode Two pretty much uses all the same cheat codes as the original game, with the obvious exception that the map codes (listed below) are all different. Also, there are only seven chapters to unlock, not fifteen.
Backgrounds for main menu screen -- ep2_background* (01, 02, 02a, 03)
To the White Forest -- ep2_outland_* (01, 01a)
This Vortal Coil -- ep2_outland_* (02 - 04)
Freeman Pontifex -- ep2_outland_* (05, 06)
Riding Shotgun -- ep2_outland_* (06a, 07, 08)
Under the Radar -- ep2_outland_* (09, 10, 10a)
Our Mutual Fiend -- ep2_outland_* (11, 11a, 11b, 12)
T-Minus One -- ep2_outland_* (12a)