Counter-Strike

Single Player Cheat codes:
These only work for single player games (i.e., not Xbox Live).
While playing the game, pause the game, and enter the following codes:

Add 16,000 Credits
UP, UP, DOWN, DOWN, LEFT, RIGHT

Autoaim Toggle
DOWN, DOWN, DOWN, DOWN, UP, UP

Big Heads
UP, UP, LEFT, RIGHT, UP, DOWN

IFF Glow
RIGHT, RIGHT, RIGHT, UP, DOWN, LEFT

Low Gravity
UP, RIGHT, RIGHT, UP, UP, LEFT

No Target Mode
LEFT, RIGHT, RIGHT, LEFT, UP, DOWN

Outfit Change
LEFT, RIGHT, DOWN, UP, LEFT, RIGHT

Player Clipping
UP, DOWN, LEFT, RIGHT, DOWN, UP

Silent Weapons
Push B button and flip to another weapon, then flip back
and the first weapon will be silenced. -

Vibrating subtitles
Enter the following case-sensitive cheat code as a profile name: "!!UNDONE!!"

Purple haired prodigy terrorists
Enter the following case-sensitive cheat code as a profile name: "PlumRugOfDoom"