Etrian Mystery Dungeon - Nintendo 3DS Infinite Dungeons to Explore: Etrian Mystery Dungeon incorporates the random map feature, which changes the floor terrain each time a player enters the dungeon. Attention to Detail: The Etrian Odyssey tradition of party customization is in full effect for Etrian Mystery Dungeon. After the first journey as a Landsknecht, players can freely choose their party of 4 from up to 10 different class types. Not Your Grandfather's Combat: The unique perspective in Etrian Mystery Dungeon means that special care will have to be given when selecting party members and upgrading their abilities.