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"GENETOS" is a freeware vertical shooter game or " shoot 'em up" developed and published by Tatsuya Koyama with an "evolution" theme. In GENETOS, the levels represent different generations in the evolution of shooting games.

The video game was developed entirely by Tatsuya Koyama who provided the graphics, programming and music, creating GENETOS entirely himself. GENETOS is free to download from Tatsuya Koyama's personal website, downloadable in either Japanese or English from the corresponding page.