Alien Trilogy

Level select:
Enter G0LVLxx, where xx corresponds to the number of the desired level, as a password. The phrase "Cheat Activated" will appear after the "Accept" option is selected to confirm correct code entry. Select the "Quit" option and start the game with just the pistol. Note that starting at level 34 will display the end sequence of the game.

God mode:
Enter 1GOTP1NK8CIDBOOTSON as a password. All weapons, unlimited ammunition, invincibility, and access to every level will be available. A new option on the title screen will allow the display to be toggled between NTSC and PAL. Note that saving the game to a memory card will only save weapons and ammunition.

Power shotgun:
Pause the game and press Triangle, Circle(2), Square.

Soundtrack:
Play track two of the game disc in an audio CD player to hear music from the game.
Information in this section was contributed by Pkmo64.

Level	Password
1-2	J3BBBBBBDWP8903BBBBBBBBMBBBXJBBB
1-3	LZBBBBBKCPB9N3DBBBCGBBMBBCD1BBB
1-4	FBBBBBBBMCPB9XLDBBBFBBBMBBCX1BBB
1-5	7LBB7BBB84PB9K3GBBBDLBLMBBDB1BBB
1-6	1LBBBBBB6WPB7F3GBBBJ2BBBBBDX1BBB
1-7	YGBJLBBB70PB9R3CQVCBG9BBDBQFJ9CLB
1-8	WGBBBBBB0HPBJLBLL3BTGBLMBVFX9DVB
1-9	XQBJLBBBMHPBJNVFQVBTGBLMCBGD9HBB
1-10	4BBBGBBBFWPBQHLPN2BTLBLJCGG29FBB
1-11	3ZBJLBBB4HPBQQ3PQVBTLBLJCGHJ9FBB
1-12	03BJGBBBHWPB9BB0H3BTLBLDCBHZ9GVB
2-1	Z3BBSBBB74PB9GVTJVBBBBBDB7JG9BVB
2-2	4BBLGBBBB8PB91B4PVBBBBBMB3JZ9C3B
2-3	4GBKVBBBZRPB9BB5QVBBBBBKCGKG9GLB
2-4	2BBQGBBBSRPBBBBB5BBBBBBBBBBKZ9GVB
2-5	0ZBBBBBD9V8PB9QWDHBBTLBLBCGLH9G3G
2-6	03BQVBD9VHPB9QWJM7BTLBLGCGL09HBD
2-7	1LBHXBD354PBJBCLPQBTBBLBB3MH9HBD
2-8	RQBBBBD988PBJCCVDBBTBBLBBVM09CBH
2-9	4BBQVBFGX4PBJJMVQGBTLBLBCGNH9FVK
2-10	77BQVBDMYMPBJ24XPQBRLBLBBZNY9HBD
3-1	8ZBCLBC8RMPBDKMPB3BS1BLBB3PF9HBF
3-2	H7BBBBCSFRPB9DWLP3BC7BBLBLP09GVB
3-3	NQBBBBCSLMPBQHCLP3BC7BBLBQQH9GVB
3-4	0GBBBBFGK8PBLH4KK2BBBBBLB7Q09CBC
3-5	KBBBBBFGCWPBLH4KJVBBBBBLB3RH9B3C
3-6	KVBBBBBRL0PB9BBBCLBSQBBMB3R099CLB
3-7	03BBBBBB8CPB9BBXDQBSQBBMCBSK9CLB
3-8	WVBBBBBBY8PB9BBXL33BN3BLMB7509CBB
3-9	TQBBBBBB4MP9P3BDQBBBBBMCGTH9BBB
3-10	4VBJLBFGDMP89XVNQVBJLBBMCBT49F3J
3-11	4VBFNBCSZ4PB94BNF7BQVBBMB7VH9F3J
3-12	S3BBBBFGS0PB94BNKZBQVBBMBZV09HBL
3-13	Q3BQVBDXRCPB94BNQVBTLBLMBGWH9GBL

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.