With a hex editor open a save game file, on the very first line (hex 0000)
you will see (something like) this:

00000000 - 0100 0000 0000 0000 0000 0000 0000 0000

now modify columns 5,6 and 7 to read F301 or FFFF; it will look like this

00000000 - 0100 0000 0000 0000 F301 F301 F301 0000

NOW YOU SHOULD HAVE MORE MONEY THAN YOU COULD EVER HOPE FOR! 



Oil Cheat

A cheat to get heaps of oil credit in KKND 

Begin a level and then save the game. 

Use a hex editor - I use XTGOLD - 

     In  XTGOLD  highlight the saved file and then press V for view, H
for  Hex,  E  for edit. After you have edited the hex press enter, Esc
and quit XTGOLD. Now go back to KKND and restart your saved game.

     In  the  Survivors  levels  the  first line of your hex will look
something like this:-

000000 0100 0000 0000 0000 0000 0000 0000 0000 

     Regardless  of  the numbers that may be in your saved game change
this to:

000000 0100 0000 0000 0000 F301 F301 F301 0000 

This will give you over 32 million oil credits. 

In the Mutants levels your hex will look something like this:- 

000000 0200 0000 0000 0000 0000 0000 0000 0000 

Change this to: 

000000 0200 0000 0000 0000 0000 FFFF FFFF FFFF 

     This will give you a negative oil figure with the result that you
will never run out of oil credits.