Continue game play:
Press Down, Right, Down two times, Left, Right, Up, Right at the title
screen after losing all lives during game play. Note: This code may only be
enabled ten times.
Sound test:
Press Up, Down, Up, Left two times, Down, Right, Up, 1 at the title
screen.
Bonus level:
Successfully complete the game. Press 1 at the title screen and choose
the "Continue" option to begin at Level 00.
Hint: Increased weapon power:
Collect a number power-up weapon, then keep collecting that same number
to increase the power of that weapon. Keep collecting yellow power capsules to
increase the power of the primary laser.
