Hidden Parts (Armored Core)

Hidden Parts can be found in several missions in Armored Core. When discovered, the player can pick up these parts by approaching them and pressing the Action/Sword button (Circle by default). Hidden Parts can only be acquired once per playthrough, and will remain in the inventory or shop even after a Human Plus restart.

Hidden Parts from Armored Core are only available in Armored Core: Project Phantasma if the player imports a save that has already acquired it, though in Armored Core: Master of the Arena, hidden parts can be bought from the shop normally.