While not the first game of its kind, Metroid (1986, Nintendo Entertainment System) is generally considered the most influential game in the Metroidvania genre.[1] Nintendo's goal for the title was to create a non-linear adventure game to set it apart from other games at the time, requiring the player to retrace their steps while providing permanent power-ups in contrast to how other adventure games only offered power-ups with temporary effects.[2] The series was popular, and future titles refined the exploration approach while adding more story elements to the title such as with Super Metroid (1994, Super Nintendo Entertainment System).[1]