Baby Aliens
When you enter the building from the helicopter, shoot the exit sign when you see a purple alien, then shoot the first three lights. This gives you the opportunity to shoot baby aliens before they form.
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Chow Palace
When you get to the point where you fight the two grenade throwing aliens, kill them and the game should give you enough time to destroy everything around them. There are yellow drums and ammo crates at this location. There is a single alien and about fifty power-ups inside Chow Palace .
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Easier game
At the start of the game, select "Warp Ahead". This puts you much further in the game than the beginning. It may be harder, but playing the beginning tasks just wastes lives.
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Invincibility
Pause game play, the press X, Circle(2), Triangle, Circle, X.
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Killing the launching opponents
Whenever you encounter the types of opponents that launch things at you, shoot at their head. Whatever they are shooting at you will also be hit, as if they were targeted. Just keep aiming at their head and they will eventually be killed. Note: This will only work on one person at a time.
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Level skip
Select "Arcade" at the main menu, then aim at the black border of the boxes with "Beginning" or "Warp Ahead" to begin farther into the game than normal.
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Rebel Kronn warrior
Shoot the first three S.T.A.A.R. team members and nothing else at the beginning of the game. After the first human is shot, you will not be harmed by any gun fire. After the third human is shot, you will transform into an alien in the main hallway of the first level. You will have infravision when playing as an alien, which allows targets to be more visible.
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Secret rooms
Enable the "Secret rooms" option. Do any one of the following to enter a room called Chow Palace, which is filled with power-ups.
Inside the bunker, shoot all the blue lights on the left wall.
Shoot out all the back windows inside the bunker.
When riding inside the forklift, shoot all the yellow barrels.
When riding inside the jeep, shoot all the yellow boxes.
When you are in the building shoot the name plate off the second door as it is opening.
When you are being bombarded by the two aliens on top of the hill, shoot everything yellow.
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Shotgun Cheat
At the Pause screen press triangle, square, triangle, left, R1.
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