Successfully complete the game. Press Select and choose the "Continue" option to begin at Level 00.
Continue game play
Press Down, Right, Down(2), Left, Right, Up, Right at the title screen after losing all lives during game play. Note: This code may only be enabled ten times.
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.
Playing Tip
Pick up a number (weapon), then continue to pick up that same number to increase the power of your weapon. Keep picking up the yellow power capsules to increase the power of your primary Laser.
Bonus level...