The Sealed Ruins (Japanese: ふういんのいわば Sealed Rocky Stretch) is a dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It is unlocked after beating Dark Hill. It consists of 15 floors with a relay point between floor eight and the first floor of Deep Sealed Ruins, where the boss, Spiritomb, is fought. Since this dungeon is located in the future, it cannot be revisited and no Pokémon can be recruited inside of this dungeon.
Along the way though this dungeon, players will encounter as many traps as they did in Dark Hill.