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METROIDVANIA (SUPER METROID)
Super Metroid (and all of Metroid by extension) has a whole genre named after it (at least partly), so this one was sort of obvious. The lock-and-key design that sees you traversing a large interconnected map that loops in around itself, gradually collecting power-ups that allow you to access parts of the map that had been inaccessible before- all of these things are the basic tenets of any metroidvania game, but Super Metroid pioneered all of this. It established a whole genre, and that genre in turn has made an impact on many other genres and game design as a whole as well, so really, the legacy of Super Metroid simply cannot be overstated.
