Alien Trilogy

All weapons:
Enter F1SH1NGFORGVNS as a password. The phrase "cheats activated" will confirm correct password entry.

Unlimited ammunition:
Enter F1LLMYPOCK1TS as a password. The phrase "cheats activated" will confirm correct password entry.

Invincibility:
Enter FVNKYG1BB0N as a password. The phrase "cheats activated" will confirm correct password entry. Note that your character may be trapped in lethal areas of the game.

Level select:
Enter FLYTOxx as a password, where "xx" is the number of the desired level (00-34). The phrase "cheats activated" will confirm correct password entry.

Hint: Level 4: Weapons:
Find all of the ID Tags you get from the security guards. You can eliminate them with the pistol. They will drop 9mm clips if you need ammunition. Once you have found all of the tags, find the battery in the blue lit room with some alien warriors. Use the shotgun to dispose of them, then return to the room where the security guards are. Power up the left one, then the battery console. It will not say "Lift Activated", but when you go into the chestburster room it will display. Return to the beginning of the level where you encountered the first warrior. You will see a lot of things. Shoot the facehuggers down with the pistol or flamethrower. You can pick up a flamethrower canister, pulse rifle, TAG, shotgun, and armor.
Information in this section was contributed by LANSDOWNE49.

Hint: Defeating the Queen:
At the end of the each episode, you have to eliminate the most powerful alien in the game. You will find her in the egg chute. This is where she is best left. First, use any gun to take care of the eggs and facehuggers. Once the eggs are destroyed, shoot the Queen's chute to bring her down. The battle requires a lot of ammunition. Use the heavy weaponry such as the pulse rifle and smartguns. She will eventually die and you can move on to the next level.
Information in this section was contributed by LANSDOWNE49.