Alien Resurrection Cheats - PlayStation

Cheat mode
Press [Circle], [Left], [Right], [Circle], [Up], [R2] at the main menu. A "Cheat" selection will appear on the options screen, allowing God mode, all weapons and unlimited ammunition, unlimited oxygen, no chestbursting, and level selection.

Research mode
Press [Square], [Up], [Down], [Circle], [Left], [R1] at the main menu. 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 grid squares as follows.

1: Small aliens
2: Quarter-size aliens
3: Tiny aliens
4: Half-size aliens
5: See-through green aliens
6: See-through red aliens
7: Invincible aliens
8: Tiny face-huggers
9: Large eggs
10: Hard enemies
11: Very hard aliens
12: Faster aliens
13: Red eggs and face-huggers
14: Slow aliens
15: Faster, weaker aliens
16: Faster, weaker face-huggers

Combinations of these grid squares can give different Alien effects. There are other combinations for large, small, and variable colors. The eggs and face huggers do not always show up immediately, however pressing [Start] brings up the effects.

6 + 13: Clear red aliens, eggs, and face huggers (normal size)
6 + 7 + 12 + 13: Clear yellow aliens, eggs, and huggers, and greenish-yellow guardian aliens (normal size)
5 + 7 + 12 + 14: Clear teal aliens, eggs, and huggers, and bluish guard aliens (normal size)
5 + 6 + 7 + 12 + 13 + 14: Clear green aliens, eggs, and huggers (normal size)
All tiles: Large green everything

Alternate menu
When you are in the main menu, enter the game twice and quit the game twice. You will now see the base of the main menu under water.