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Halley's Comet is an arcade video game created by Pacific Manufacturing Ltd and licensed to Taito for manufacture. Receiving a world wide release in 1986, Halley's Comet is a vertical scrolling shoot 'em up where the player defends various planets around the solar system from a direct collision with Halley's Comet and the various alien swarms which accompany it. ==Description== The game opens with the player above Earth with the message "Defend the Earth from comets!". The player ship must navigate two stages per planet in the solar system (including Pluto, as the game was released well before the re-classification of Pluto in 2006.〔Pluto#2006: IAU classification〕) As enemy waves spawn at the player, all surviving enemy ships, and in rare cases, shots, will proceed past the player down a mini-map on the right-hand side of the screen and impact the planet. Each impact causes a 1% increase to the planet's damage. If the planet hits 100%, the game is over, regardless of the remaining stock of player lives. The first stage of each planet is divided by a mini-boss fight. This encounter is a large ship that fires large bullets in clusters at the player while standard enemy waves continue to spawn. The second half of the first stage ends with an encounter with the "comet" which will share the same colour as the planet being defended (blue for Earth, yellow for Venus, Red for Mars, and so on) The comet boss will open a small section of its exterior, revealing a small patch of circuitry from which a bullet will spawn. When the player destroys 5 such openings, the comet will explode and allow the player ship to enter the comet, starting stage two for that planet. Stage two for each planet encounter takes place inside the comet, which appears to be an alien ship. Enemy waves continue to spawn until the player reaches the main boss for that planet. A large ship with 10 orange targets that will alternate between covered and uncovered, firing a bullet for each active target when opened. When the player destroys each of the targets, the boss explodes, and the planet is saved. The screen then changes to a bonus point calculation where points are awarded based inversely on the amount of damage the planet has taken during the level. The planet encounter order is as follows: Earth → Venus → Mercury → Mars → Jupiter → Saturn → Uranus → Neptune → Pluto → The Sun 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Halley's Comet (video game)」の詳細全文を読む スポンサード リンク
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