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Pro Atmospheric sound and graphics
Metroid paved the way for using not only sound and graphics, but level design as an element of atmosphere in games. Its deep, dark, winding tunnels with cleverly hidden passages and non-linear gameplay, together with its foreboding soundtrack and sound effects create a desolate feeling of loneliness akin to the cinematography of the film "Alien".
Pro Created a new sub-genre (Metroidvania)
Pro Encouraged speed running
Pro Challenged players' assumptions
Metroid uses this mechanic to go step further - upon being completed in under a certain amount of time, it breaks players assumptions and defies gender stereotypes in revealing that the hero they've been playing as is actually a heroine.