Miami Movie Billboard
Across the street from the bank, there is a theater. There is displayed a billboard that says: "Half Life The Movie starts Friday at 11".

Cheat Codes
Press START and tap the D-Pad for:

Low Gravity - UP, RIGHT, RIGHT, UP, UP, LEFT
No Target Mode - LEFT, RIGHT, RIGHT, LEFT, UP, DOWN
IFF Glow - RIGHT, RIGHT, RIGHT, UP, DOWN, LEFT
Big Heads - UP, UP, LEFT, RIGHT, UP, DOWN
Player clipping - UP, DOWN, LEFT, RIGHT, DOWN, UP
Autoaim Toggle - DOWN, DOWN, DOWN, DOWN, UP, UP
Add 16,000 Credits - UP, UP, DOWN, DOWN, LEFT, RIGHT
Outfit Change - LEFT, RIGHT, DOWN, UP, LEFT, RIGHT

Note: These codes only work for single player games.

Vibrating subtitles
Enter UNDONE!! as a case-sensitive profile name.

Alternate Prodigy terrorists
Enter PlumRugOfDoom as a case-sensitive profile name. The terrorists at Prodigy will now have purple streaked hair.