Alien Trilogy (US) Cheats

Go to the password screen and type in:
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1g0tp1nk8c1db00ts0n
Then there will be a cheats menu on the main screen.
To activate the Cheat Menu go to passwords and put in:
1GOTP1NKAC1DBOOTSON
There is now a selectable cheats menu which you can make yourself invincible,max weapons, level select,put it into pal mode and more!
Enter G0LVL & the level you want to start at as the password. Then Accept
password, quit it, and start the game normally. (There is no O available in the password section ! Select a 0 [Zero] !!) Level 34 for example is the end-sequence.