The demo includes the game’s competitive multiplayer mode, Blast Ball, where two teams of three players don mech suits to shoot a giant ball into their opponents’ goal. The mode was unveiled at last year’s Nintendo World Championships event at E3 2015.
Federation Force is the upcoming Metroid spinoff from Luigi’s Mansion: Dark Moon developer, Next Level Games. The game will feature both single-player and cooperative elements and have players take control of a Galactic Federation marine, rather than series protagonist Samus Aran.
Next Level Games has also released new footage of the game's cooperative mode, which you can view above.
Metroid Prime: Federation Force launches for 3DS on Aug. 19.