The player selects four members from a team of agents, each with their own unique personalities
 - Led by the 16th President of the United States of America, Abraham Lincoln – to fight back against aliens invading the planet.

While the combat is turn-based, it takes place with a third-person view, giving this strategy game the immersive feel of a third-person shooter. Online multiplayer and matches against other players add to the fun.

The next entry of the Etrian Odyssey Untold series is essentially two games in one
- the first, a Nintendo 3DS update to Etrian Odyssey 2: Heroes of Lagaard (released on Nintendo DS) with new dungeon layouts, new graphics, and system improvements from the recent Etrian Odyssey Untold . The second is the Untold portion - a brand new story mode with a fixed party, voiced dialogue, and animated cutscenes that follows the bittersweet tale of the Fafnir Knight and Princess Arianna.

Like Persona Q, the Untold portion of the game has a strong focus on characters and their interactions as the story about the Fafnir Knight and Princess Arianna unfolds as they adventure forth into the ruins of Ginnungagap and the Yggdrasil Labyrinth with the hero Flavio and the two mysterious adventurers, Bertrand and Chloe.