EX Dungeon (隠しダンジョン Kakushi Danjon?, "Hidden Dungeon") is a type of a difficult dungeon available after completing the game or just before completing the game in some titles in the Tales series. They are meant to test the player's battle abilities with strong opponents, many of them being cameos of playable characters from previous entries in the series, and often contain gimmicks not found elsewhere. EX Dungeons generally have little relevance to the main story of any Tales entry.