ナイトメア・ガールズ - 世紀の封印を解く, Etrian Odyssey Untold The Millennium Girl (Europe) (En) is a dungeon crawler role-playing game developed and published by Atlus for the Nintendo 3DS. This game is a remake of the first installment in the Etrian Odyssey series and includes new features, such as a full-voiced story mode and a remake of the classic soundtrack. Players take on the role of a hero who must explore the Yggdrasil Labyrinth to find a way to break the Millennium Seal and save the world. Players must create their own party of adventurers and battle monsters in the labyrinth while gathering resources and uncovering the secrets of the Yggdrasil Tree. The game features a classic dungeon-crawling experience with turn-based battles and a deep character customization system. Etrian Odyssey Untold The Millennium Girl (Europe) (En) is an exciting adventure that will challenge players to explore the depths of the Yggdrasil Labyrinth and discover its secrets.