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document updated 20 years ago, on May 26, 2006

Scrolling shooters:
    http://en.wikipedia.org/wiki/Jets%27n%27Guns
        http://en.wikipedia.org/wiki/Tyrian_%28game%29
        http://en.wikipedia.org/wiki/Project-X
        http://en.wikipedia.org/wiki/Walker_%28computer_game%29
    http://www.elephant-games.com/games/rip/