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''Positron'' is a video game which was published for the BBC Micro and Acorn Electron computers by Micro Power in 1983. It was developed on a pre-release Electron and was one of the few games (other than those produced by Acornsoft) available for the machine on its launch. ==Gameplay== The player controls a laser base which can move left and right and fire vertically. The object of the game is to destroy all alien creatures on each screen, then proceed to the next. The first sheet of aliens follows the classic ''Space Invaders'' style of moving, that being left to right, then moving down one row before moving right to left. The standard ''Invaders'' strategy of picking off the end columns to stop a rapid descent also applies to the first sheet of Positron. This first sheet however is not representative of the rest of the game and serves only to lull the player into a false sense of security. All subsequent sheets follow a pseudo-random formation, generally moving down the screen but at various speeds and with greatly varying levels of firepower for each individual enemy. This means the strategy must change to looking to find which enemies are descending fastest and picking them off while also trying to break up big groups. While the aliens from sheet 2 onward look different and are slightly faster than their predecessors, they all move in the same fashion. They are called, in order of appearance, Cyber, Spazmoid, Galactic Hulk, Hep-Hep, Graber, Bum-Fluff, Phantom, Orb and Mega-Bod. Destroying the mothership which appears above the Mega-bods ends the first wave, and starts you again from the beginning (now 'wave 2, sheet 1'), with faster enemies. This game is notable because of its speed. In particular, the game has probably the fastest player fire-rate of any of the non-scrolling shooters of the period. Most similar games of the time will only let you fire again when the previous laser bolt has either hit an alien or left the screen. ''Positron'' has no such limits leading to a much quicker game. It also differs from most such games in that if a life is lost, the sheet begins again regardless of the number of enemies killed. This makes for an infuriating game if the player is killed by the last enemy of the sheet and can lead to effectively repeating the same sheet over until all lives are lost. The game was also notable for its quick loading time from tape. At under 2 minutes, it was significantly lower than most. As a comparison, Acornsoft's ''Arcadians'' (a similar but more complex game) takes more than twice as long to load. 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「Positron (video game)」の詳細全文を読む スポンサード リンク
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