Halley Wars
Encyclopedia
Halley Wars is a vertical space scrolling shoot 'em up
Shoot 'em up
Shoot 'em up is a subgenre of shooter video games. In a shoot 'em up, the player controls a lone character, often in a spacecraft or aircraft, shooting large numbers of enemies while dodging their attacks. The genre in turn encompasses various types or subgenres and critics differ on exactly what...

 that was originally on the Family Computer Disk System and later on the Game Gear
Sega Game Gear
The was Sega's first handheld game console. It was the third commercially available color handheld console, after the Atari Lynx and the TurboExpress....

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It is set in the middle of the 21st century. The armies of Lord Halley are launching attacks on planet Earth using Hailey's Comet as the spearhead of the attack. You represent the last chance for Earth piloting a craft specially developed to engage the enemy hordes. The game has six long stages set in locations in space such as, above planets, inside enemy vessels or in asteroid fields. There is always a big boss at the end of each stage each with its own weakness. There are power-ups, which can be picked up along the way when you shoot particular asteroids or satellites. These upgrade your weapon strength, speed, shields and add small drone wingmen ships which assist in firing. The enemies mostly attack in waves with similar types of vessel attacking together in formation.
The game is unusual in the way any enemies or comet debris not destroyed on the journey makes it to earth and does some damage there. Comets do more damage than the enemy ships do. If Earth's damage level reaches 100% the game ends. For every 2000 points you score, 1% of Earth's damage is repaired. There are three difficulty settings: Easy, Medium and Hard with each progressively having more, new and tougher enemies.
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