Invincibility
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Invincibility: LEFT, SQUARE, UP, TRIANGLE, RIGHT, CIRCLE, DOWN, X. Press
START to confirm code. If done correctly, the code will appear in the box to the
right.
Unlimited Ammo
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Unlimited Ammunition: DOWN, X, LEFT, CIRCLE, DOWN, X, LEFT, CIRCLE. Press
START to confirm code. If done correctly, the code will appear in the box to the
right.
Unlock Alien Mode
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Alien Mode: UP, TRIANGLE, UP, TRIANGLE, UP, TRIANGLE, UP, TRIANGLE. Press
START to confirm code. If done correctly, the code will appear in the box to the
right.
Unlock Invisibility
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Invisibility: LEFT, SQUARE, RIGHT, CIRCLE, LEFT, SQUARE, RIGHT, CIRCLE.
Press START to confirm code. If done correctly, the code will appear in the box
to the right.
Unlock Slow Motion Mode
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Slow Motion Mode: RIGHT, SQUARE, UP, TRIANGLE, RIGHT, SQUARE, UP,
TRIANGLE. Press START to confirm code. If done correctly, the code will appear
in the box to the right.
Unlock Xen Gravity
Go to the Cheat Code screen in the Options menu and enter the following cheat to
unlock Xen Gravity: UP, TRIANGLE, DOWN, X, UP, TRIANGLE, DOWN, X. Press START to
confirm code. If done correctly, the code will appear in the box to the right.