Metroid II: Return of Samus

Metroid II: Return of Samus (メトロイドII RETURN OF SAMUS, Metoroido Tsū Ritān Obu Samusu) is a video game for the Game Boy handheld. It is the second game in the very popular Metroid video game series. The game's protagonist, Samus Aran, must once again traverse through large caves and defeat plenty of enemy aliens.

Story
Samus has been hired to wipe out all remaining metroids on their home planet. Driving deeper and deeper into planet SR388 Samus finds many new evolutions of Metroids and has to gain new power ups to be able to defeat the increasingly powerful enemies. And as she finally digs deep enough Samus encourages the Queen Metroid, the mother of all Metroids. Can she defeat it and save the galaxy from the Metroids once and for all?

Trivia

 * The game was featured on the cover of Nintendo Power V31.