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.

Level passwords:
Enter one of the following passwords to begin game play at the corresponding level under the Xenomania difficulty setting.
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

Alien Trilogy (Game Shark)
Codes Made & Tested on 1.86 Version Game Shark

1 Infinite Energy 8009A040 03E7
2 Infinite Armor 8009A042 03E7
3 Infinite Charge Grenades 8009A058 03E7
4 Infinite Handgun Bullets 8009A046 03E7
5 Infinite Shotgun Bullets 8009A04A 03E7
6 Infinite Flame Thrower Rounds 8009A052 03E7
7 Infinite Pulse Riffle Rounds 8009A04C 03E7
8 Infinite Pulse Rifle Grenades 8009A050 03E7
9 Infinite Smart Gun Rounds 8009A054 03E7
10 Infinite Batteries 8009A05A 03E7
11 Infinite Boots 8009A044 03E7
12 Have Shotgun 8008F33E 0029
13 Have Flame Thrower 8008F34A 0029
14 Have Pulse Rifle 8008F342 0029
15 Have Smart Gun 8008F346 0029
16 Have Auto Mapper 8009A03C 03E7
17 Rapid Firer 8009A024 0001
18 Infinite Shoulder Lights 8009A05C 0014
19 Infinite Night Vision 8009A060 0014