Unknown Item

Three Mystery Items are found in Metroid: Zero Mission. Initially, they are unusable by Samus as upgrades. Instead, they allow certain blocks bearing images of the associated Mystery Item to be destroyed. Until the player defeats the Chozo Hieroglyphic, the Mystery Items appear as question marks on the inventory screen. After defeating it, the Mystery Items' true identities are revealed to be the Gravity Suit, Plasma Beam, and Space Jump.