* Change speed
While paused, press right and left on to adjust the speed of your ship up to 4 levels.

Press at the Title Screen to start.
You'll lose a ship if you're hit by an enemy while at your initial weapon level.
It's GAME OVER when you lose all of your ships.
When CONTINUE?is displayed at the GAME OVER Screen, select "YES" to continue your game.
You can keep continuing from the last stage played before GAME OVER.
Select "NO" to return to the Title Screen.

A comet is discovered in the vicinity of Pluto. While investigations are being conducted, the comet changes course and heads towards a collision with Earth.
Mankind uses missiles to successfully change the comet's course but the comet then crashes into the moon.
In order to inspect the damage, probes travel to the enormous lunar crater, created by the impact of the comet. What they discover is not traces of a comet, but a gigantic mother ship.
From Earth to the deepest part of the crater, blast your way through all 6 SCENES in order to protect the planet from the aliens.
Avoid enemy attacks and fight your way to the boss at the end of each SCENE.
Attack the bosses' weak points to destroy them and clear the SCENE.
After clearing a SCENE, you will receive a bonus depending on the number of enemies destroyed.
Enemies destroyed by the Special bomb will not count toward the bonus.

Power-Ups

There are two types of power-ups for your ship, weapons and options.
By collecting the same power-up item, you can increase its level up to 4.

Weapons

There are four types of weapon power-ups, Vulcans, Waves, Lasers, and Rings,
each with their own special characteristics.
There are certain advantages and disadvantages to using specific weapons
in certain SCENES. Choose your power-ups wisely!

Bombs

When a weapon is at its maximum level, picking up the same colored power-up
will increase your bombs by 1. You can hold up to 9 bombs.
Picking up a Special bomb will also increase your number of bombs.

Options

There are two types of power-up options, Homing missiles and Shields.
You can choose to equip one or the other.

Losing Ships

Your weapon level will decrease by 1 when hit by an enemy attack.
If you're hit by an enemy attack when at your initial weapon level, you'll lose 1ship.
Option levels decrease by 2 when you lose a ship.

Items

	Vulcans	Rapid fire in up to a maximum of 5 directions.
	Waves	Weak waves that cover a wide top-down area.
	Lasers	Lasers with piercing power.
	Rings	Slow fire rings that have strong piercing power.
	Special bomb	Pick it up to destroy all enemies on screen.
	Homing missile	Two guided missiles that fire above and below.
	Shield	A barrier that forms around your ship.

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