Metroid (NES)

The first game in the series, released in 1986 to compete with Pong. The plot revolves around Samus, who decides to visit the planet Zebes to destroy various alien creatures simply minding their own business, the Metoids, Mother Brain, and the finally the whole planet, in that exact order. She also assassinates Kraid and Ridley along the way, because they owed her money for previous bounty hunting missions.

Gameplay
Metroid immerses gamers in a hyper-realistic world of jumping, shooting, and exploring really creepy dungeons in outer space. Gameplay involves backtracking through surreal levels, followed by more backtracking, and even more, all the while fighting off bizarre monsters that apparently have nothing better to do than crawl/fly around in the same preordained pattern for eternity. It also happens to be the hardest game in the entire series, by the way. Since it was released in the 1980s, that meant it doesn't have a battery save function, so you have to write down a password consisting of OVER 9000 characters. Oh by the way you can actually type swears in it