Alien Resurrection

Cheat mode
At the main menu, press Circle, Left, Right, Circle, Up, R2. A "Cheat" selection will appear on the options screen, allowing God mode, all weapons, infinite ammunition, infinite oxygen, no chestbursting, and level selection. -From: kissace69@hotmail.com

Research mode
At the main menu, press Square, Up, Down, Circle, Left, R1. A "Research Mode" selection will appear on the options screen. This mode allows you to change some of the game's Aliens and Facehuggers (shrinking them, making them wire-framed, semi-transparent, etc.). This is done by highlighting various sequences of grid squares. -From: kissace69@hotmail.com

Game Shark Codes

Max Reverse Joker Command -- D00BDB92 ????
Infinite Health -- 8010D620 2400
Infinite Chestburst Time -- 8005162C 0000
Infinite Pistol Ammo -- 8011BCC4 0064
Infinite Shotgun Rounds -- 3011BCD6 00FF
Infinite Shotgun Ammo -- 8011BCC6 0064
Infinite Pulse Rifle Rounds -- 3011BCD8 00FF
Infinite Pulse Rifle Ammo -- 8011BCC8 0064
Infinite Flamethrower Rounds -- 3011BCDA 00FF
Infinite Flamethrower Ammo -- 8011BCCA 0064
Infinite Electric Gun Rounds -- 3011BCDC 00FF
Infinite Electric Gun Ammo -- 8011BCCC 0064
Infinite Grenade Launcher Rounds -- 3011BCDE 00FF
Infinite Grenade Launcher Ammo -- 8011BCCE 0064
Infinite Laser Rounds -- 3011BCE0 00FF
Infinite Laser Ammo -- 8011BCD0 0064
Infinite Rocket Launcher Rounds -- 3011BCE2 00FF
Infinite Rocket Launcher Ammo -- 8011BCD2 0064
Infinite Small Medipacks -- 8011BCE4 0009
Infinite Medium Medipacks -- 8011BCE6 0009
Infinite Large Medipacks -- 8011BCE8 0009
Infinite Flashlight -- 8011BCFC 00FF
Infinite Portable Autodoc -- 3011BD02 00FF
All Weapons -- 3011BCBC 00FF
Items Never Decrease -- 800525AE 0000
Stop Timer -- 8005C356 0000
Press Select For More Time -- D00BDB92 FFFE 8011BE0C 7080