Alien Trilogy
Level Skip
Go to the password screen and enter "GOLVL" followed by a number from 0-34 (ie. final stage= GOLVL34). Then Highlite the word "Accept" and press the X button, the words "Cheats Activated" will appear on the screen. Now go back to the title screen and select "Start Game". Your game will start from the level you selected. If you would like to see the end movie, put in "GOLVL35" as your password, then start.
Cheat Mode
Go to the password screen and put in "1G0TP1NK8C1DB00TS0N" Higlight accept, press X and the words "Cheats Activated" will once again appear. Now when you go to the main menu you will find a new menu called "Cheats" Now you may be come invincible or eve