Enter these cheats at the title screen to get the desired effect.

invincibility - RIGHT, A, R, Y, UP, L, A, LEFT, L, B, A, R

full weapon power - UP, DOWN, A, X, R, Y, Y, LEFT, B, L, L, RIGHT

full area effect - LEFT, A,Y, UP, A, DOWN, X, L, LEFT, R

full beam - LEFT, B, Y, RIGHT, L, X, LEFT, R, R, Y

full bolt - LEFT, RIGHT, UP, DOWN, L, B, Y, R, LEFT, DOWN, X, X

full homing - RIGHT, UP, X, L, LEFT, LEFT, L, LEFT, B, LEFT

full spread - L, R, B, L, DOWN, UP, L, RIGHT, LEFT, A

won't drop weapon levels - DOWN, UP, A, X, DOWN, UP, A, X, L, L, X, B

level select - R, Y, LEFT, B, X, L, LEFT, UP, A, DOWN, L, X

all combat skills training levels - X, UP, L, LEFT, Y, A, R, B, RIGHT, R, X, B

boss mode - R, Y, DOWN, DOWN, A, L, LEFT, X, RIGHT, Y, R, L

agent data - UP, DOWN, B, R, LEFT, L, RIGHT, A, R, X, UP, R

alien data - X, L, B, L, DOWN, Y, R, RIGHT, A, LEFT, R, Y

making Of FMV - B, L, R, B, Y, DOWN, X, A, RIGHT, L, A, Up