Rapid-Fire Laser:
     At  the  main  title  screen  press  Up,  Up, Down, Down, Circle,
Triangle,  Square while the letters are flying together. You will hear
a BOOM. During the game press X to use the rapid-fire laser.

Unlimilted continues:
     At  the  main  title  screen press Up, Right, Down, Left, X, X, X
while the letters are flying together.