A new Nintendo Treehouse: Live @ E3 demonstration featuring Metroid Prime producer Kensuke Tanabe showed a mission from Metroid Prime: Federation Force that had players battling space pirates. It was revealed that each mech in the game has a loadout weight limit, keeping players from entering a mission overpowered. Unlockable mech mods include shields, armor buffs, weapon buffs, and more. It was confirmed that the game will be playable on the regular Nintendo 3DS and 3DS XL using the gyroscope. Tanabe says the game was first conceptualized ten years ago. You can watch the footage above.