Summary: Etrian Mystery Dungeon, known in Japan as Sekaiju to Fushigi no Dungeon (世界樹と不思議のダンジョン, Sekaiju to Fushigi no Danjon, lit. "Yggdrasil and the Mystery Dungeon"), is a role-playing video game for the Nintendo 3DS. It was developed by Spike Chunsoft and Atlus, and published by Atlus in Japan on March 5, 2015 and in North America on April 7, 2015. It is also planned to be published by NIS America in Europe on September 11, 2015.The game is a crossover between Atlus' Etrian Odyssey series, and Spike Chunsoft's Mystery Dungeon series.