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README.md

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+A Space Invaders clone written in Python and Pygame for the Raspberry Pi.
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+The original challenge was to write a playable and challenging re-make in around 300 lines of code (v0.1). 
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+This project was created by Russell Barnes for [Linux User & Developer magazine](http://linuxuser.co.uk) issue 136 (v0.1) and for a follow-up article in issue 137 (v.0.2) which added animation and sound.
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+Player ship & background courtesy of [Rawdanitsu](http://opengameart.org/users/rawdanitsu).
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+Alien ship image with thanks to [Skorpio & Wubitog](http://opengameart.org/content/3-spaceships).
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+Player laser beam sound effect courtesy of [medetix](www.freesound.org/people/medetix).
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+Explosion sound effect courtesy of [timgormly](www.freesound.org/people/timgormly).
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+Music is Arpanauts taken from Eric Skiff's excellent album [Resistor Anthems](http://freemusicarchive.org/music/eric_skiff).