During   the   game,  type  1982gonzo.  In  some  versions,  type
gonzo1982. Then press the following key combinations simultaneously:

Code                    Result 
SHIFT+V                 Trace user
SHIFT+X                 Teleports selected commandos    
CTRL+I                  Invincibility 
CTRL+SHIFT+N            Finishes mission 
CTRL+SHIFT+X            Destroy everything
Shift+F1/F2/F3/F4       Video mode

Backpack cheat:
     The  Diver  can take two other men in his backpack. When his boat
is  in  the water, pick it up using the hand. If you let two commandos
step into the boat st the right moment, they'll go with the boat, into
the  backpack  of  the  diver/spy.  Now you can swim as a diver to the
other  side  of the water, which is much less suspicious then when you
use  your  boat. But when you die, the men you carry with you will die
too! So be careful!

Enter these Level codes on the Password screen:


Mission                 Code
2                       4JJXB
3                       ZDD1T
4                       RFF1J 
5                       K4TCG 
6                       DT1WN 
7                       IH3W1 
8                       52WJ7 
9                       924BF 
10                      HYBM3 
11                      JF0P3 
12                      4MB4D 
13                      BJK4Y 
14                      TI8D1 
15                      XQWDC 
16                      334MW 
17                      VTIM3 
18                      R4OJF 
19                      TFCWB 
20                      DDKW1