Men In Black cheats and cheat codes for PC

While playing the game, hit the ESC key to go to the main menu. Then 
type DOUGMATIC a few times until the menu drops back and you are in 
the game again. The cheat mode will now be activated. 

Press Esc again to get the main menu to pop up. Now you can enter 
the following codes:

Code - Effect:

TEMPLE - Go to Amazon Temple
PROTECTME - Invulnerability
MOVEME - Gives saved games of all levels
LOADME - Infinite ammunition
KILLEM - Kills villains
HQ - Travel to HQ
HEALME - Restore health to the maximum
GIVEME - Get all weapons (it will not reload current weapons)
FRALES - Travel to Frales Island
ARCTIC - Travel to Arctic Level
AMAZON - Travel to Amazon Level
AGENTX - Become Agent X
AGENTL - Become Agent L
AGENTK - Become Agent K
AGENTJ - Become Agent J


Change your face bitmap code:

You can play MIB as anyone (even yourself). 
Just replace the following files:

../art/3d/textures/head_f.bmp AND ../art/3d/textures/head_b.bmp 

with any head bitmap (even a pic of yourself). 
Then use the cheats to play as Agent X.


Fight against the final boss:
When you are in the last level and when fighting against the boss aka Frales
use the 7th weapons. Other guns have no effect on him.