Metroid: Zero Mission takes place on Planet Zebes, a large, open-ended world with areas connected by doors and elevators. The player controls Samus Aran as she travels through the planet's caverns and environments, hunting Space Pirates. Along the way, the player collects power-ups that enhance Samus's armor and weaponry, as well as grant her special abilities. These abilities allow Samus to access areas that were previously inaccessible,[1] so that the game can be played linearly or non-linearly. For example, the player may come across caverns that bypass certain sections, a method termed sequence breaking. To save their progress, players can enter either Save Rooms or Samus's ship on Crateria. As a remake of Metroid, Metroid: Zero Mission's layout bears a resemblance to the original, and various powerups and items make reappearances from previous games in the series, with similar uses, effects, and appearances.[1] However, the game adds new items, areas, and mini-bosses,[2] as well as a completely new area named Chozodia.[1]
Zero Mission is the first game in the Metroid series to include a sequence in which the player controls Samus without her Power Suit. In this portion of the game, Samus is more vulnerable to damage, must crawl through ducts on her hands and knees without the help of her Morph Ball mode, and has a weak pistol that briefly stuns enemies as her only weapon. However, Samus retains all energy tanks she acquired previously.[3]
Completion of the game unlocks an emulated version of the original Metroid game. Zero Mission also allows players to unlock the Metroid Fusion picture gallery by linking between Zero Mission and Fusion cartridges via the Game Boy Advance Game Link Cable.
