ok here's how its done...

First the cheats only work while your in the main game its self (your blowing
up missiles.)  Also, if you enter a cheat code you cannot get a highscore or
save your game.

So with no further adieu..

FIRST:

Press and hold ALT and type 4 2 0 on the numeric key pad.

Release the ALT key.

Now the action should have frozen.  Now type one of these keys:

S - SUPER shield, if yer gonna die do this one.

M - You now have a million dollars.

L - then hold ALT and type a number in the same fashion the 420 was entered
    the number you type will be your new level.  From 0 to 255.

E - End current level, make INCOMING change to 0.

there they are.. i hope i didn't forget any :)
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