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.
