Enter the following at the press start screen to unlock Agent data:
up, down, circle, R2, left, L2, right, X, R2, square, up, R1
the lettering will flash for confirmation

Enter the following at the press start screen to unlock Alien data:
square, L1, circle, L2, down, triangle, R1, right, X, left, R2, triangle.
the lettering will flash for confirmation

Enter at the Pres Start Screen. When entered correctly, the screen will flash
Up, Down, X, square, R1, Triangle, triangle, left, O, L1, L1, right

Enter the following code at the press start screen to unlock Boss mode:
R1, triangle, down, down, X, L2, left, R2
The lettering will flash for confirmation.

At the ''Press Start'' screen enter these button combinations:

Agent Data Unlocked
UP, DOWN, CIRCLE, R2, LEFT, L2, RIGHT, X, R2, SQUARE, UP, R1

Alien Data Unlocked
SQUARE, L1, CIRCLE, L2, DOWN, TRIANGLE, R1, RIGHT, X, LEFT, R2, TRIANGLE

All CST Unlocked
SQUARE, UP, L2, LEFT, TRIANGLE, X, R2, CIRCLE, RIGHT, R1, SQUARE, CIRCLE

All Levels Unlock
R2, TRIANGLE, LEFT, CIRCLE, SQUARE, L2, LFET, UP, X, DOWN, L2, SQUARE

All weapons at full powerups
UP, DOWN, X, SQUARE, R1, TRIANGLE,TRIANGE, LEFT, CIRCLE, L1, L1, RIGHT

Boss Mode Unlocked
R1, TRIANGLE, DOWN, DOWN, X, L2, LEFT, SQUARE, RIGHT, TRIANGLE, R2, L1

Don't drop pickups when hit
DOWN, UP, X, SQUARE, DOWN, UP, X, SQUARE, L1, L2,SQUARE, CIRCLE

Making Of Mode Unlocked
CIRLE, R2, L2, CIRCLE, TRIANGLE, DOWN, SQUARE, X, RIGHT, L1, X, UP

For Bolt Weapon
LEFT, RIGHT, UP, DOWN, L1, CIRCLE, TRIANGLE, R2, LEFT, DOWN, SQUARE, SQUARE

For Spread Weapon
L2, R1, CIRCLE, L2, DOWN, UP, L1, RIGHT, LEFT, X

For Homing Weapon
LEFT, UP, SQUARE, L1, LEFT, LEFT, L1, LEFT, CIRCLE, LEFT

Invincibility
Right, X, R1, Triangle, Up, L2, X, Left, L1, Circle, X, R2

All Weapons code
Up, Down, X, Square, R1, Triangle, Triangle, Left, Circle, L1, L1, Right

Full Beam
Left, Circle, Triangle, Right, L1, Square, Left, R1, R1, Triangle

Unlock versus mode.
At the title screen hold down L1 and R1 after that press circle and square simultaneously.

Enter the following code at the press start screen to unlock Invincibility:
right, X, R1, triangle, up, L2, X, left, L1, circle, X, R2.
The lettering will flash for confirmation.

Enter the following code at the press start screen to unlock Level Select:
R2, triangle, left, circle, square, L2, left, Up, X, down, L2, Square
The lettering will flash for confirmation.

Enter the following code at the press start screen to unlock Level Select:
R2, triangle, left, circle, square, L2, left, Up, X, down, L2, Square
The lettering will flash for confirmation.

Enter the following code at the press start screen to unlock No power-up drops:
down, up, X, square, down, up, X, square, L1, L2, square, circle
The lettering will flash for confirmation.

Press - Square, Up, L2, Left, Triangle, X, R2, Circle, Right, R1, Square, Circle.