Zero Point

Hint: Shoot faster:
Put your finger through the trigger hole. Quickly move your finger back and forth in the trigger hole to quickly shoot. This is useful in situations where you just have to shoot a certain number of any target to qualify without losing a life.
Information in this section was contributed by Swishmaster3470.

Hint: Always find extra life in the bonus stage:
About 85% of the time, the health is in the cup to the very far right.
Information in this section was contributed by Swishmaster3470.

Hint: Completing the last level:
Have two people play. Have one person protect the others from the tossed rocks, and have the other person concentrate on shooting the Boss and depleting his life.
Information in this section was contributed by Swishmaster3470.

Hint: Random level block:
Do not shoot any of the "?" blocks when you complete a level. The CPU will select one automatically.
Information in this section was contributed by Swishmaster3470.

Hint: Get first place in the rankings:
Use as little money as you can to complete the game. Points are secretly deducted as you put in more money (when you lose all three hearts).
Information in this section was contributed by Swishmaster3470.

Hint: Complete the game without doing any shooting except on the last level:
Keep putting in credits as you lose lives, and continue repeatedly. Eventually, you will get to the last level. Obviously this is going to require $10.00 or more, but you will still technically have completed the game. The only thing that require the slightest bit of skill is defeating the Boss.
Information in this section was contributed by Swishmaster3470.