Autoshot : repeatedly press the FIRING button for a couple of seconds, then, hold the button.
If you defeat the giant tank boss with only the default single shot weapon, you will get the lazer powerup. Lose your existing weapons by, carefully, allowing them to be hit by enemies; you must do this before the tank boss enters the screen. Note : Bomb strikes must not be used to defeat the tank boss, or the lazer powerup will not appear.
By using your Bomb attack when the score reads 777,000-odd, a 7UP powerup will appear, giving you seven extra lives.