What 2016 Nintendo 3DS Metroid spin-off focuses on Galactic Federation marines?

The 2016 Nintendo 3DS Metroid spin-off focused on Galactic Federation marines is Metroid Prime: Federation Force.

Developed by Next Level Games and published by Nintendo, Federation Force places players in mechanized armor suits modeled after Samus Aran’s Power Suit. It is set after Metroid Prime 3: Corruption and follows soldiers tackling Space Pirate activity in the Bermuda System.

Unlike most Metroid games, Samus is not the main playable character. Players control Federation Force marines, either alone or cooperatively with up to four players. Missions emphasize first-person shooting, team roles, weapon customization, and objective-based combat rather than the solitary exploration associated with the main series.

A common mix-up is Metroid Prime Hunters, another handheld first-person shooter. Hunters was released for Nintendo DS and centered on competing bounty hunters, while Federation Force was a cooperative 3DS game built around Galactic Federation soldiers. Its included Blast Ball mode also gave the game a brief sports-like multiplayer option.