This is it. The all-time classic that is not only considered to be the best Metroid game to date, but also the game that set a whole new standard for gaming in general. This, alongside Castlevania: Symphony of the Night, are originators of the term Metroidvania to define this style of exploration and upgrade and action play. And to this day, neither has been surpassed, at least in terms of reputation. And it took me a couple playthroughs to truly appreciate this game.