Etrian Mystery Dungeon (決闘の迷宮, Kettō no Meikyū) is a dungeon crawler role-playing video game developed by Spike Chunsoft and published by Atlus for the Nintendo 3DS. It is a crossover between the Etrian Odyssey and Mystery Dungeon series. The game is set in a world called Aslarga, where adventurers, known as Explorers, must battle their way through randomly generated dungeons in order to save the world from a mysterious force known as the Gloom. Players take control of an Explorer and create a team of up to four characters, each with their own unique skills and abilities. The game features a turn-based battle system and a variety of items, equipment, and monsters that can be encountered in the dungeons. Etrian Mystery Dungeon also features a number of difficulty levels, allowing players to choose the challenge that best suits their play style.