Call of Duty 4: Modern Warfare

Cheat mode in DEMO mode:
Activate the console by using the option menu. Then, press ~ (tilde) to bring up
the console window. Enter the following console command:
seta thereisacow "1337"

Now enter "spdevmap bog_a" as a console command to start the demo in cheat mode.

During the game, play press ~ to display the console window again and type any
of the following cheat codes:

Code - Effect
timescale ## - Change speed where ## is a number (default value is "1.00")
notarget - - Deaf and blind enemies
noclip - - Activate no clipping mode
jump_height ## - Change gravity where ## is a number (default value is "39")
god - Enable god mode
give ammo - Get maximum ammo
give all - - All weapons available