Metroid II: Return of Samus is a video game released for the Game Boy in 1991. It is the second installment in the Metroid series, developed by Nintendo. Players control Samus Aran, a bounty hunter tasked with exterminating the Metroid species on the planet SR388 to prevent them from becoming a threat to the galaxy. The game features a side-scrolling format and introduces new gameplay mechanics, such as the ability to morph into a ball and lay bombs. Players explore various environments, defeat enemies, and collect power-ups to enhance Samus's abilities as they progress through the game.