Etrian Odyssey (ユーロイアオデッセイ) is a role-playing video game developed and published by Atlus for the Nintendo DS. The game is set in the kingdom of Etria and follows a group of adventurers as they explore the Yggdrasil Labyrinth, a mysterious and dangerous dungeon filled with monsters and treasures. Players take control of a party of adventurers and explore the labyrinth, using the DS's touch screen to map out their progress. The game features a variety of character classes, each with their own unique abilities and skills, as well as a variety of weapons and items to collect. Battles are turn-based, with the player controlling each character individually. Etrian Odyssey also features a variety of side quests and mini-games, as well as a New Game+ mode, allowing players to start the game over with their previous characters and items. Etrian Odyssey is a challenging and rewarding game that is sure to please fans of classic role-playing games.