Halley's Comet is a vertical Shooter from Taito
The player defends the solar system from a direct collision with Halley's Comet and the various meteorit- and Alien Spaceship swarms which accompany it. You start above the Earth and the first two levels consist of the approach towards the comet split in the middle by a mini boss enemy. Once you have reached the comet you must split the comet open and proceed inside the comet where an alien race have hollowed out the comet and are currently residing inside. Proceed through the waves of enemies will result in meeting the end of level big boss. On defeating this you can proceed to the next planet which essentially is more of the same with some new enemy ships.
To assist you in your fight, many power ups are available. These are obtained by shooting smaller rocks which float past you. Power ups are triple front cannon, mini ships, wide spread cannon, increased speed, increased maneuverability and at the end of each sequence of power ups a wild card special in the form of a smart bomb, a complete power up of cannons or a full complement of mini ships.