Metroid II: Return of Samus

Metroid II: Return of Samus arrived on the Game Boy as a direct sequel to the original Metroid on the NES, tasking players once again with controlling bounty hunter Samus Aran — this time on the Metroid homeworld of SR388. The game launched into a Game Boy library that was already proving the handheld could host serious, atmospheric experiences, and it pushed the hardware in notable ways for its era. Where the original Metroid spread its action across the interconnected caverns of Planet Zebes, Return of Samus took a more structured approach: the planet SR388 is divided into distinct regions separated by pools of acidic fluid called "Metroid Fluid" (or Acid). As Samus hunts down and eliminates a fixed number of Metroids — 39 in total across multiple evolutionary forms — the acid level drops, opening new passages and allowing progression deeper into the planet. This mechanic gave the game a clear sense of forward momentum that the original's open-ended structure did not always provide. Players navigate using the Game Boy's two-button layout alongside the directional pad, with Samus able to run, jump, morph into the Morph Ball, and fire her arm cannon. The game introduced several new power-ups that would become franchise staples, most notably the Spider Ball (allowing Samus to cling to and traverse walls and ceilings in Morph Ball form) and the Space Jump (enabling near-infinite chained jumps). The Plasma Beam also made its series debut here. The level structure is largely linear by necessity — the acid pools act as natural gates — but hidden rooms and optional power-up expansions reward thorough exploration, keeping the Metroidvania spirit of the original alive. The monochrome Game Boy display presented a challenge for atmosphere: SR388's caverns are rendered in shades of grey, and the game compensates with varied tile sets and enemy designs across its regions, though some players found the visual sameness of certain areas disorienting. A seismic indicator in the HUD tracks how many Metroids remain, rumbling as Samus approaches a Metroid encounter. In its era, the game was received as a worthy portable successor to the NES original, praised for its sense of scale and the ambition of fitting a full Metroid experience onto a cartridge designed for a handheld device. The haunting, minimalist soundtrack composed for the Game Boy's sound chip contributed to an atmosphere of isolation that suited the lone-hunter narrative. The game's conclusion — in which Samus encounters a newly hatched Metroid larva that imprints on her — directly sets up the events of Super Metroid on the Super Nintendo, making Return of Samus a pivotal chapter in the series' overarching story.