Side-scrolling action-adventure where you navigate a quarantined space station overrun by shape-shifting parasites. You're Samus, infected then cured, now hunting an X parasite that copied your fully-powered suit and is replicating across the station. Progress unlocks new areas through ability upgrades—missiles, suit enhancements, movement tech—but a stronger version of yourself stalks you throughout. Objectives guide you sector by sector rather than pure open exploration. Combat mixes standard enemies with tense encounters against the SA-X, which you can't fight until late game. The station's segmented layout and directed progression create a tighter structure than earlier entries. Absorbing X parasites restores health and ammo, turning former threats into resources. Cold damage is now your weakness. Ends with a plan to destroy the station and the planet it orbits.
