While gameplay, go to the main menu by press Esc.
After that, type DOUGMATIC(you will hear a sound if done correctly).When you have enter DOUGMATIC, the game will return to gameplay.
Now go to main menu and type DOUGMATIC again.After doing that go to main menu and enter the following codes:
GIVEME=all weapons
LOADME=unlimited ammo
HEALME=Full Health
PROTECTME=unlimited health
AGENTJ=Become Agent J
AGENTK=Become Agent K
AGENTL=Become Agent L
AGENTX=Become Agent X
/Thanks for reading this!