Etrian Odyssey (Japanese title: Sekaiju no Meikyuu) is a dungeon-crawling role-playing game developed by Atlus and released for the Nintendo DS in Europe. Players explore a vast and mysterious underground labyrinth, known as the Yggdrasil Labyrinth, while creating and customizing their own party of adventurers. The game features turn-based battles, an expansive skill tree and a variety of character classes to choose from, allowing for a high degree of customization. Players must use their wits and strategic skill to explore the labyrinth and defeat the powerful monsters that lurk within. Etrian Odyssey also features a unique mapping system, where players must draw their own maps in order to navigate the labyrinth. With its deep and engaging gameplay, Etrian Odyssey is an addictive and rewarding adventure that is sure to keep players coming back for more.